.NET · C# · ASP.NET · 2026 comparison

Choosing a .NET development company: 15 firms with proof of .NET work

Independent ranking: Sortlist does not rank itself, and agencies cannot pay for their position in this ranking.

By Nicolas Finet, Co-founder & CEO of Sortlist · Updated on October 8, 2026 · How we ranked

Most firms list .NET among twenty technologies; these ones have the projects or the client reviews to show for it.

Best .NET development company for your project

Different projects need different firms. Our picks from the independent ranking:

For complex systems and legacy modernisation: Chudovo – 33 published .NET projects – the most in the ranking – and a review describing an ASP.NET lending platform taken over and modernised.
For a C# .NET back end in the Netherlands: Trone – 3 reviews describe C# .NET systems, including an ERP and a full app rebuild.
For Azure and C# on a small budget: Startbit IT Solutions – 7 reviews describe .NET, C# or Azure work, from €500.
For a cross-platform .NET app with a US office: Techcronus – ASP.NET and Xamarin apps in its reviews, 5.0 from 66 reviews.
For enterprise and healthcare platforms: Glorium Technologies – 240 people, 5.0 from 52 reviews, .NET work for a private clinic chain.
For a .NET migration to the cloud: Sigli – a client describes the modernisation of a legacy logistics system moved to the cloud with .NET.

The 10 best .NET development companies – independent ranking

The 10 best .NET development companies – independent ranking
#	Agency	Score	Rating	Based in	From	Best for
1	Chudovo	92/100	5.0 (22)	Germany	€3,000	Complex business systems and modernising an existing .NET platform
2	Trone	86/100	4.98 (27)	Netherlands	€3,000	Dutch companies that need a C# .NET back end for an app or an ERP
3	Techcronus	84/100	5.0 (66)	United States	€1,000	Long-term .NET and Xamarin app partnerships with a US contact
4	Startbit IT Solutions	83/100	5.0 (32)	India	€500	C#, ASP.NET and Azure work on a tight budget
5	Glorium Technologies	78/100	5.0 (52)	Ukraine	€20,000	Larger companies digitalising processes: ERP, healthcare platforms, automation
6	Plavno	78/100	5.0 (16)	United States	€10,000	AI agents and voice assistants built into business software
7	Accedia	74/100	5.0 (12)	Bulgaria	€1,000	Fintech and AI proofs of concept with a European nearshore team
8	Brights	72/100	5.0 (13)	Poland	€3,000	Start-ups and scale-ups turning an idea into a product
9	Impulsa3	71/100	4.96 (21)	Spain	€2,000	Spanish SMEs that want a web platform and the marketing behind it
10	Sigli	71/100	5.0 (11)	Belgium	€1,000	Moving a legacy .NET system to the cloud

The 10 strongest .NET development companies on Sortlist

Ranked by our score out of 100. Each card says what the firm is best for, summarises what its clients say in their reviews, and tells you when another firm would serve you better.

1
Rank 1: Chudovo
“Complex Systems Implementation”
92/100
- 5.0/5 (22 reviews)
- Castrop-Rauxel, Germany
- from €3,000
- 50 people
- German, English, Ukrainian, Russian
- 33 published projects in this service
Best for: complex business systems and modernising an existing .NET platform
Chudovo is a 50-person custom software company with an office in Castrop-Rauxel, Germany, focused on implementing complex systems for healthcare, finance, e-commerce, logistics and telecoms. One fintech client describes Chudovo taking over the maintenance of a lending platform with an ASP.NET developer while preparing it for modernisation.
Why #1?
- 33 .NET projects published on Sortlist – by far the most in the ranking.
- A perfect 5.0 from 22 verified reviews.
- Proactive suggestions praised in 10 reviews.
Score breakdown: rating 100/100 · review volume 74/100 · published work 100/100
Less suited if you need very quick delivery on a loosely defined scope – several clients mention extra rounds of clarification before building.
View Chudovo’s profile
2
Rank 2: Trone
“Web, app, and AI development”
86/100
- 4.98/5 (27 reviews)
- Haarlem, Netherlands
- from €3,000
- 10 people
- Dutch, English, NL-BE
- 16 published projects in this service
Best for: dutch companies that need a C# .NET back end for an app or an ERP
Trone, in Haarlem, is a 10-person team building websites, apps, web applications and AI automation. Three of its clients describe .NET work: a C# .NET ERP system, a rebuilt app with a React Native front end and a C# .NET back end, and an AI system with a Flutter app on a .NET back end.
Why #2?
- 4.98 from 27 reviews.
- 16 .NET projects published on Sortlist.
- 3 reviews describe C# .NET back ends, including a full app rebuild delivered within a €35,000 budget.
Score breakdown: rating 93/100 · review volume 79/100 · published work 80/100
Less suited if you need a large team or round-the-clock support – Trone has 10 people.
View Trone’s profile
3
Rank 3: Techcronus
“Your Digital Transformation Partner”
84/100
- 5.0/5 (66 reviews)
- Los Angeles, United States
- from €1,000
- 75 people
- English, French, German, Italian, Spanish
- 1 published project in this service
Best for: long-term .NET and Xamarin app partnerships with a US contact
Techcronus has offices in Los Angeles and India and has worked on web, mobile, cloud, AI and analytics projects since 2013, for brands it names as Starbucks, Unilever and IKEA. Its published Insurance Management Portal was built with .NET MVC, Angular and AWS.
Why #3?
- A perfect 5.0 from 66 reviews – the largest review volume in the top 10.
- Clients mention ASP.NET apps and a long-term Xamarin cross-platform app.
- Entry from €1,000.
Score breakdown: rating 100/100 · review volume 100/100 · published work 20/100
Less suited if you want reviews with detailed project descriptions – many of its reviews are short.
View Techcronus’s profile
4
Rank 4: Startbit IT Solutions
“Designing The Future”
83/100
- 5.0/5 (32 reviews)
- Jaipur, India
- from €500
- 85 people
- English, Hindi
- 3 published projects in this service
Best for: c#, ASP.NET and Azure work on a tight budget
Startbit IT Solutions, in Jaipur, India, is an ISO 9001 and ISO 27001 certified IT services company with 85 people. Seven of its reviews describe Microsoft-stack work: an Azure data warehouse with C# Web APIs, a .NET HR application integrated with Dynamics 365, an ASP.NET MVC ERP with SQL Server and Azure CI/CD.
Why #4?
- 7 reviews describe .NET, C# or Azure work – the most in the ranking.
- A perfect 5.0 from 32 reviews.
- Entry from €500.
Score breakdown: rating 100/100 · review volume 83/100 · published work 39/100
Less suited if you need your developers in a European or US time zone, or very frequent progress reports.
View Startbit IT Solutions’s profile
5
Rank 5: Glorium Technologies
“Digital Transformation Solutions Company”
78/100
- 5.0/5 (52 reviews)
- Kyiv, Ukraine
- from €20,000
- 240 people
- English
- 0 published projects in this service
Best for: larger companies digitalising processes: ERP, healthcare platforms, automation
Glorium Technologies, with 240 people, specialises in digital transformation, ERP and business process automation for compliant, scalable enterprise systems. Its clients describe a .NET website and multiplatform apps for a private clinic chain, built with a team assembled in a week.
Why #5?
- A perfect 5.0 from 52 reviews.
- 3 reviews describe .NET work.
- The largest team in the top 10.
Score breakdown: rating 100/100 · review volume 94/100 · published work 0/100
Less suited if your budget is below €20,000, its entry point – the highest in the ranking.
View Glorium Technologies’s profile
6
Rank 6: Plavno
“AI-First Software Company: Secure Agents, Voice Assistants, and Scalable Cloud.”
78/100
- 5.0/5 (16 reviews)
- Alexandria, United States
- from €10,000
- 150 people
- English, French, Russian, German
- 3 published projects in this service
Best for: aI agents and voice assistants built into business software
Plavno presents itself as an AI-first software company with more than 20 years of experience and domain teams for healthcare, e-learning, fintech, travel and fleet management. Its recent published work includes voice agents for logistics and candidate pre-screening, and a CRM and marketplace for Mercedes-Benz parts.
Why #6?
- A perfect 5.0 from 16 reviews.
- 3 .NET projects published on Sortlist.
- A 150-person team with pre-formed domain teams.
Score breakdown: rating 100/100 · review volume 66/100 · published work 39/100
Less suited if your budget is below €10,000, its entry point.
View Plavno’s profile
7
Rank 7: Accedia
“Exceeding expectations”
74/100
- 5.0/5 (12 reviews)
- Sofia, Bulgaria
- from €1,000
- 250 people
- English, German, Bulgarian
- 2 published projects in this service
Best for: fintech and AI proofs of concept with a European nearshore team
Accedia, founded in 2012 in Sofia, is a 250-person IT services company for technology consulting and custom software. Its published cases include digital lending for Castle Trust Bank and regulatory work for Alexforbes, and most of its recent reviews are about AI projects.
Why #7?
- A perfect 5.0 from 12 reviews.
- 2 .NET projects published on Sortlist.
- Entry from €1,000.
Score breakdown: rating 100/100 · review volume 59/100 · published work 31/100
Less suited if you want reviews of .NET projects specifically – most of its reviews concern AI work.
View Accedia’s profile
8
Rank 8: Brights
“Bright people building bright software | Custom Software Development Agency | 300+ projects”
72/100
- 5.0/5 (13 reviews)
- Warsaw, Poland
- from €3,000
- 120 people
- English, Ukrainian
- 1 published project in this service
Best for: start-ups and scale-ups turning an idea into a product
Brights is a software company with 120 engineers, designers and analysts that has delivered more than 300 projects in 30 countries, from MVPs to platforms for large companies, including a cloud migration to AWS for Philip Morris International. It holds ISO/IEC 27001 certification.
Why #8?
- A perfect 5.0 from 13 reviews.
- A .NET project published on Sortlist.
- ISO/IEC 27001 certified.
Score breakdown: rating 100/100 · review volume 61/100 · published work 20/100
Less suited if your project is a .NET maintenance contract rather than a new product.
View Brights’s profile
9
Rank 9: Impulsa3
“Tech · Marketing · AI. It's time to get real results.”
71/100
- 4.96/5 (21 reviews)
- Madrid, Spain
- from €2,000
- 15 people
- Spanish, English
- 2 published projects in this service
Best for: spanish SMEs that want a web platform and the marketing behind it
Impulsa3, in Madrid, is a 15-person company combining technology, marketing and AI to help businesses grow revenue, from websites and e-commerce to web applications.
Why #9?
- 4.96 from 21 reviews.
- 2 .NET projects published on Sortlist.
- Development and marketing from one team.
Score breakdown: rating 85/100 · review volume 73/100 · published work 31/100
Less suited if you need a pure .NET engineering firm – most of its reviews concern websites and e-commerce.
View Impulsa3’s profile
10
Rank 10: Sigli
“Software development, Web development, Data Solutions, AI, ML.”
71/100
- 5.0/5 (11 reviews)
- Antwerp, Belgium
- from €1,000
- 115 people
- English, LT, NL-BE, Dutch, French
- 1 published project in this service
Best for: moving a legacy .NET system to the cloud
Sigli, in Antwerp, is a 115-person software company focused on digital product development, data science and AI. One client describes Sigli modernising a legacy logistics system and migrating it to the cloud with .NET, redesigning the architecture and rewriting much of the software.
Why #10?
- A perfect 5.0 from 11 reviews.
- A published .NET project and a review describing a .NET cloud migration.
- Entry from €1,000; works in five languages.
Score breakdown: rating 100/100 · review volume 57/100 · published work 20/100
Less suited if you need a fixed date on a migration – one client reports delays caused by cloud migration issues.
View Sigli’s profile

All 15 ranked .NET development companies

All 15 agencies with at least 10 verified reviews, scored with the same formula. Ranks 11 to 15 are often the best fit for a specific country, language or budget.

Show all 15 agencies

Full independent ranking of .NET development agencies on Sortlist
#	Agency	Based in	Rating	Published work	Score
1	Chudovo	Castrop-Rauxel, Germany	5.0 (22)	33	92
2	Trone	Haarlem, Netherlands	4.98 (27)	16	86
3	Techcronus	Los Angeles, United States	5.0 (66)	1	84
4	Startbit IT Solutions	Jaipur, India	5.0 (32)	3	83
5	Glorium Technologies	Kyiv, Ukraine	5.0 (52)	0	78
6	Plavno	Alexandria, United States	5.0 (16)	3	78
7	Accedia	Sofia, Bulgaria	5.0 (12)	2	74
8	Brights	Warsaw, Poland	5.0 (13)	1	72
9	Impulsa3	Madrid, Spain	4.96 (21)	2	71
10	Sigli	Antwerp, Belgium	5.0 (11)	1	71
11	Your Tech Club	Amsterdam, Netherlands	4.97 (10)	3	69
12	CELUGA	Paris, France	4.92 (20)	1	61
13	Hidden Brains	Munich, Germany	4.92 (12)	1	57
14	Leaware	Torun, Poland	4.83 (13)	5	47
15	DJM digital	Vise, Belgium	4.73 (32)	1	29

Promising agencies with fewer than 10 reviews

Too few reviews to be scored reliably yet, but excellent ratings so far.

iterates
4.88/5 (5 reviews) · Etterbeek, Belgium
Code The Kiwi
5.0/5 (1 review) · Sint-Katelijne-Waver, Belgium

Published .NET projects of the ranked firms

Number of .NET projects each firm has published on Sortlist – the eight highest counts among the 15 ranked firms.

Chudovo33
Trone16
Leaware5
Startbit IT Solutions3
Plavno3
Your Tech Club3
Accedia2
Impulsa32

Show the data as a table

Category	Projects
Chudovo	33
Trone	16
Leaware	5
Startbit IT Solutions	3
Plavno	3
Your Tech Club	3
Accedia	2
Impulsa3	2

Why 73 well-reviewed firms on the listing are not ranked

Sortlist’s .NET listing also shows software, web and marketing agencies that tick .NET among many technologies. Of the 88 firms with at least 10 reviews and no sponsored placement, 73 have no .NET project published on Sortlist and fewer than 3 reviews describing .NET, C#, ASP.NET or Azure work. They may be excellent – their profiles just do not show it for .NET.

Tip: ask any .NET firm for a project on the same .NET version and application type as yours – an ASP.NET Core API, a WPF desktop tool or a MAUI app are different skills – and for the name of the developer who led it.

Firms on the .NET listing without published .NET work or reviews describing it
Agency	Based in	Rating	Reviews describing .NET
Mirrorful	First New Cairo, Egypt	★ 4.98 (206)	0 of 74
Quantum IT Innovation	Dallas, United States	★ 5.0 (158)	0 of 65
AppCrops	South Houston, United States	★ 5.0 (58)	0 of 50
Hello Pomelo	Paris, France	★ 4.93 (57)	0 of 52
Pink Panda Technologies	East Cobb, United States	★ 4.99 (55)	0 of 54
Kuchoriya Techsoft	Erie County, United States	★ 5.0 (49)	0 of 49
Studio Ubique	Zwolle, Netherlands	★ 4.94 (46)	0 of 46
Missing Spot	Erbil, Iraq	★ 4.98 (45)	0 of 45
Mindrops	Grimbergen, Belgium	★ 4.85 (45)	0 of 45
The Brink Agency	Amsterdam, Netherlands	★ 4.63 (43)	0 of 43
Digital Unicorn	Paris, France	★ 4.99 (42)	0 of 42
Talosmart	Lagos, Nigeria	★ 4.78 (40)	0 of 40
BluePixel	Miguel Hidalgo, Mexico	★ 5.0 (38)	0 of 38
Fulminous Software	Clarendon County, United States	★ 5.0 (38)	0 of 38
Quality Professionals (Q-Pros)	Austin, United States	★ 4.96 (35)	0 of 35
NYBE	Hasselt, Belgium	★ 4.82 (35)	0 of 35
Newwave Solutions	Cầu Giấy, Vietnam	★ 5.0 (34)	0 of 34
HAKI	Barcelona, Spain	★ 4.89 (30)	0 of 30
Simpalm	North Bethesda, United States	★ 5.0 (27)	0 of 27
Wavect	Ampass, Austria	★ 5.0 (27)	0 of 27
Josh Digital	Paris, France	★ 5.0 (26)	0 of 26
WebSenor	Queens County, United States	★ 5.0 (25)	0 of 25
SPRYLAB	Berlin, Germany	★ 4.93 (24)	0 of 24
Yield Studio	Paris, France	★ 5.0 (23)	0 of 23
Talfac	Paris, France	★ 4.94 (22)	0 of 22
Pixels Trade	Geneva, Switzerland	★ 4.57 (21)	0 of 21
DG Technologies	Province of Pescara, Italy	★ 5.0 (20)	0 of 20
Creatiwity	Paris, France	★ 4.98 (20)	0 of 20
Software Alliance	Lahore, Pakistan	★ 4.8 (20)	0 of 20
Digitilizeweb	Greater Manchester, United Kingdom	★ 5.0 (18)	0 of 18
U1CORE	London, United Kingdom	★ 4.98 (18)	0 of 18
Gaspa Agency	Brussels, Belgium	★ 4.95 (18)	0 of 18
Graffino	Sibiu, Romania	★ 5.0 (16)	0 of 16
Vinova	Singapore, Singapore	★ 5.0 (15)	0 of 15
Gaia Digital	Amsterdam, Netherlands	★ 5.0 (15)	0 of 15
FuturByte	Dubai, United Arab Emirates	★ 5.0 (15)	0 of 15
Ascendro Technologies	Timișoara, Romania	★ 4.83 (15)	0 of 15
RaftLabs	Dublin, Ireland	★ 5.0 (14)	0 of 14
AGENCE QUANTUM	Bordeaux, France	★ 5.0 (14)	0 of 14
Bewise	Valencia, Spain	★ 4.96 (14)	0 of 14
Bullshark	Birkirkara, Malta	★ 4.71 (14)	0 of 14
digitransform	Rabat, Morocco	★ 4.93 (13)	0 of 13
hafencity.dev GmbH	Hamburg, Germany	★ 4.95 (12)	0 of 12
Solid Digital	Hilversum, Netherlands	★ 4.95 (12)	0 of 12
Synsoft Global	Indore, India	★ 4.9 (12)	1 of 12
DBot Software	Bangkok, Thailand	★ 4.9 (12)	0 of 12
Extrovert Information Technology (EitBiz)	Fort Wayne, United States	★ 4.69 (12)	0 of 12
Elephant	Dordrecht, Netherlands	★ 4.3 (12)	0 of 12
cc.systems GmbH	Hamburg, Germany	★ 5.0 (11)	0 of 11
IPANEMA Technology	Paris, France	★ 5.0 (11)	1 of 11
WeeTech Solution Pvt Ltd	Surat, India	★ 5.0 (11)	0 of 11
BM Digital Marketing Agency in Dubai	Dubai, United Arab Emirates	★ 5.0 (11)	0 of 11
TRIARE	Cherkasy, Ukraine	★ 4.94 (11)	0 of 11
VentureLab	Naples, Italy	★ 4.89 (11)	0 of 11
Qubix Consulting GmbH	Eschborn, Germany	★ 4.86 (11)	0 of 11
Trango Tech	Dubai, United Arab Emirates	★ 4.83 (11)	0 of 11
Easyweb	Lyon, France	★ 4.69 (11)	0 of 11
Instinctools	Potomac, United States	★ 5.0 (10)	0 of 10
SEREVIA	Osmoy, France	★ 5.0 (10)	0 of 10
Databay Solutions	Benalmádena, Spain	★ 5.0 (10)	0 of 10
Nehos Groupe	Toulouse, France	★ 5.0 (10)	0 of 10
Euro Tech Conseil - Agréée CII	Paris, France	★ 5.0 (10)	0 of 10
SIMDO	Eindhoven, Netherlands	★ 5.0 (10)	0 of 10
RSunBeat Software	Pala, United States	★ 5.0 (10)	0 of 10
GVN Marketing	Bangkok, Thailand	★ 5.0 (10)	0 of 10
M TECHUB LLC	Loudoun County, United States	★ 5.0 (10)	0 of 10
Wess Soft	Lyon, France	★ 5.0 (10)	0 of 10
Codingart	Agadir, Morocco	★ 4.97 (10)	0 of 10
Budventure Technologies Pvt. Ltd.	Ahmedabad, India	★ 4.97 (10)	0 of 10
Snack Groupe	Paris, France	★ 4.97 (10)	0 of 10
Net-Informatica	Zanè, Italy	★ 4.94 (10)	0 of 10
Seasia Infotech	Edmonton, Canada	★ 4.94 (10)	0 of 10
Progressive Byte	Dhaka, Bangladesh	★ 4.81 (10)	0 of 10

Names you will see in other .NET rankings

Other “top .NET development companies” lists cite large Central and Eastern European engineering firms again and again. They can be strong choices for big programmes, but most do not collect reviews on Sortlist.

How they look on Sortlist

We looked each one up on Sortlist to assess it with the same method; none qualifies yet:

Innowise (Frankfurt) – 5.0 from 29 reviews on Sortlist, but it is not on this listing and none of its reviews describes .NET work, so it is not scored here.
ELEKS (Berlin) – A software engineering company cited in most .NET rankings; 1 review on Sortlist so far.
Future Processing (Gliwice) – A Polish software company frequently listed for .NET; no reviews on Sortlist yet.
Brainhub (Gliwice) – Publishes its own .NET ranking; no reviews on Sortlist yet.
Vention (London) – A software development company present in several .NET lists; no reviews on Sortlist yet.
Itransition (Lakewood, CA) – A software development company offering .NET services; no reviews on Sortlist yet.
ScienceSoft (McKinney, TX) – An IT consulting and software development company; no reviews on Sortlist yet.
Software Mind (Kraków) – A software engineering company cited in .NET rankings; no reviews on Sortlist yet.
10Pearls (Washington, DC) – A digital engineering company cited in .NET rankings; no reviews on Sortlist yet.
Blackthorn Vision (Ukraine) – Publishes its own .NET ranking; no reviews on Sortlist yet.

We could not find a Sortlist profile for Leobit, Cleveroad, Saritasa, DataArt, N-iX, Brainvire or Binariks, which also appear in other rankings. Without verified reviews on Sortlist, we cannot compare them fairly with the agencies above.

How we ranked the agencies

1. The sample

Sortlist lists 715 .NET development providers on this page. We evaluated the 220 agencies on the first three pages of the listing, in its relevance order. 94 of them have at least 10 verified client reviews – our threshold for a rating to be meaningful. 6 of those also pay for a sponsored placement and were set aside, leaving 88. Of these, 15 agencies with at least one published .NET project on Sortlist or at least 3 client reviews describing .NET work were ranked, with 359 verified reviews between them and an average rating of 4.95; the 73 others are listed separately.

2. The score

Scoring criteria
Criterion	Weight	How it is measured
Client rating	50%	Average of verified reviews, placed on a scale from the lowest (4.73) to the highest (5.0) rating in the ranked group
Review volume	30%	Number of verified reviews on a logarithmic scale, up to the most reviewed agency (66 reviews)
Published work	20%	.NET development projects published on Sortlist, on the same logarithmic scale, up to the highest count (33 projects)

3. Independence

Sortlist is a marketplace, not an agency: it does not appear in its own ranking.
Agencies cannot pay to enter the ranking or to move up. Agencies with a sponsored placement on this listing are excluded from scoring and shown separately.
The order of the listing page, subscriptions and badges play no part in the score – only the three criteria above.

4. Limits

Reviews reflect each agency’s work across all its services, and agencies with few reviews may be excellent but are not yet scored. That is why every entry says what it is best for – and when another agency would suit you better. The ranking is updated regularly.

Which .NET your project should run on – and why it matters in a quote

“.NET” covers two different platforms. The old .NET Framework (last version 4.8.1) runs only on Windows and receives fixes but no new features. Modern .NET – formerly .NET Core – is cross-platform, open source and released every November, with a long-term support (LTS) version every two years.

.NET versions and support (Microsoft support policy)
Version	Type	What it means for a new project
.NET 10	LTS, released November 2025	The default choice for a new application today
.NET 9	Standard-term support	Ends in November 2026 – plan the upgrade now
.NET 8	LTS, released November 2023	Ends in November 2026 – existing apps should move to .NET 10
.NET Framework 4.8.1	Windows only, maintenance	Only for maintaining existing applications

Write the target version into the contract. A firm that proposes .NET Framework for a new project in 2026 is reusing old code or old habits.
Budget an upgrade every two years. Moving from one LTS version to the next is usually days of work, not months – if dependencies are kept up to date. Ask how they handle it.
Check the NuGet packages. An abandoned third-party library is the most common thing that blocks an upgrade. Ask for the list of external packages and their licences at delivery.

Leaving .NET Framework: what a migration partner should tell you first

Many .NET projects are not new builds but migrations of ten-year-old Windows applications. The difficulty depends on which parts of the old framework you use – a good firm inventories them before quoting:

Migrating from .NET Framework to modern .NET
What you have	Path to modern .NET	Effort
Class libraries and business logic	Retarget to .NET 10, fix incompatible packages	Low
ASP.NET MVC or Web API	Port to ASP.NET Core MVC or minimal APIs	Medium
ASP.NET Web Forms	No direct port – rewrite in Razor Pages or Blazor	High
WCF services	CoreWCF for compatibility, or gRPC / REST for a redesign	Medium to high
WinForms or WPF desktop apps	Run on modern .NET, still on Windows only	Low to medium
Entity Framework 6	Keep EF6 on modern .NET or move to EF Core	Medium

1
Inventory
List projects, framework dependencies (System.Web, WCF, Web Forms) and NuGet packages; Microsoft’s .NET Upgrade Assistant gives a first report.
2
Test safety net
Add automated tests on critical paths before changing anything – most legacy .NET code has few.
3
Migrate in slices
Libraries first, then services, then the user interface; run old and new side by side behind a proxy where possible.
4
Cut over and switch off
Agree on the date the old version is retired – otherwise you pay to maintain both.

In our ranking, Chudovo and Sigli describe this kind of modernisation work in their reviews.

ASP.NET Core, Blazor, MAUI or WPF? Match the firm to the application type

A strong ASP.NET Core API team is not automatically good at desktop or mobile. Ask for references on the same kind of application as yours:

.NET application types
You are building	Typical .NET technology	Ask the firm for
A web API or back end	ASP.NET Core Web API, EF Core or Dapper, SQL Server or PostgreSQL	API documentation, load tests, versioning approach
A web application	ASP.NET Core MVC or Razor Pages, or Blazor	Why they chose server-side, WebAssembly or a JavaScript front end
A mobile app	.NET MAUI (successor of Xamarin), or a .NET back end with a native or React Native app	Apps in the stores, and how they handle OS updates
A Windows desktop tool	WPF or WinForms on modern .NET	Installer and update strategy
Cloud services	Azure App Service, Functions, Container Apps – or AWS and Docker	Infrastructure as code and monthly cost estimates
Microsoft business apps	Dynamics 365, SharePoint, Power Platform extensions	Experience with your exact Microsoft product and licences

Reviews in the ranking show this range: Xamarin apps at Techcronus, Azure data warehouses and Dynamics 365 integrations at Startbit IT Solutions, C# back ends for React Native and Flutter apps at Trone.

A technical vetting call in 45 minutes

You do not need to be a developer to see whether a .NET team knows its craft. Bring a technical colleague if you can, and ask the developer who will actually work on your project – not the salesperson – these questions:

Questions to ask a .NET development company
Ask	What a strong answer includes
Which .NET version would you use, and why?	The current LTS version, and a plan for the next upgrade
How is the solution structured?	Clear layers or modules, dependency injection, no business logic in controllers
How do you test?	Unit tests (xUnit, NUnit or MSTest), integration tests, a coverage target on critical code
What does your CI/CD pipeline do?	Build, tests and deployment on every merge – GitHub Actions or Azure DevOps
How do you handle database changes?	Versioned migrations (EF Core migrations or scripts), never manual changes in production
How would you find a slow endpoint or a memory leak in production?	Logging and tracing (OpenTelemetry, Application Insights or similar), profiling tools
Show us a pull request from a recent project.	Code review comments, small changes, readable naming

Then ask for a paid two-week pilot on a real but contained piece of work. It costs little compared with the project and shows you their code, communication and estimates in practice.

Budgets and engagement models for a .NET project

Of the 220 .NET development profiles we evaluated, 220 state a minimum project budget: 107 accept projects from €1,000 and 14 start lower, while 51 start at €5,000 or more. In the ranking, entry points go from €500 at Startbit IT Solutions to €20,000 at Glorium Technologies.

Minimum project budget of 220 .NET development providers

Number of providers per stated minimum project budget, among the profiles evaluated on the first three pages of Sortlist’s .NET listing (profiles without a stated budget excluded).

14Under €1,000
107€1,000
9€1,001–2,999
39€3,000–4,999
51€5,000+

Show the data as a table

Category	Agencies
Under €1,000	14
€1,000	107
€1,001–2,999	9
€3,000–4,999	39
€5,000+	51

.NET engagement models
Model	How it works	Good for	Watch out for
Fixed price	Defined scope, price and date	A well-specified application or migration slice	Change requests priced at a premium
Time and materials	Hours or days billed as work progresses	Products that evolve, modernisation	Needs weekly budget tracking
Dedicated team	A stable team working only on your product	Long-term products	Notice periods and team changes
Staff augmentation	Individual developers join your team	You have a tech lead and processes	You manage quality yourself
Maintenance retainer	Monthly hours for fixes and upgrades	Applications in production	Unused hours, response times

A hidden cost to raise early: licences. SQL Server, some UI component libraries and Visual Studio subscriptions are paid; PostgreSQL and open-source libraries are not. Ask the firm to list every licence the solution will need – and in whose name.

Contract clauses specific to .NET projects

Your repository from day one

The code lives in your GitHub, GitLab or Azure DevOps organisation, with the firm invited as a member – not the other way round.

Your Azure or AWS subscription

Cloud resources are created in your subscription, so you keep them if you change provider. The firm gets access, not ownership.

Licences in your name

Commercial NuGet packages, component libraries and SQL Server licences are bought for your company.

Build and deployment documented

A new developer must be able to build and deploy the solution from the README alone.

No undisclosed subcontracting

Ask for the names of the developers and the right to approve replacements.

Warranty period

Bugs found in the first months after delivery are fixed at no extra cost – agree on how long.

About the author

About the author: Nicolas Finet

Co-founder and CEO of Sortlist. An entrepreneur passionate about B2B marketing and about helping companies grow, he has been connecting companies with the right marketing agencies across Europe since 2014. His focus: digital strategy, business development and scaling B2B marketplaces. He oversees this methodology and the data behind every Sortlist ranking.

LinkedIn · X (@nifinet)

Projects published by the ranked firms

Examples from the firms’ Sortlist portfolios – the technologies are given where the project page names them:

Insurance Management Portal

Techcronus · for confidential · Insurance

A portal where users upload their existing insurance policies, compare them with new offers, and renew policies for their assets and pets. Built with .NET MVC, Angular and AWS.

MVC4 & EF5, iTextsharp, Bootstrap, ASP.NET

Startbit IT Solutions · for Grind Analytics · Data analytics

A data analytics reporting system with dynamic charts, processing data in SQL, built on ASP.NET MVC with Entity Framework.

Online Kreditplattform für Kleinunternehmen

Chudovo · for NDA · Fintech

A financing platform for small businesses: applicants fill in a form and connect their online banking, the system analyses the business to propose the best type of financing, and funds arrive within 24 hours. Includes an online loan calculator.

Turnaround planning software

Trone · for Tacs · Petrochemical industry

A web portal for planning turnarounds – large maintenance projects – in the petrochemical industry, with a dashboard of running and completed projects and a Kanban board for teams.

Frequently asked questions

What is .NET used for?

.NET is Microsoft’s open-source development platform, mainly programmed in C#. Companies use it for web applications and APIs (ASP.NET Core), Windows desktop software, mobile apps (.NET MAUI), cloud services on Azure or AWS, and integrations with Microsoft products such as Dynamics 365 and SharePoint.

Is .NET still a good choice for a new project?

Yes, for business applications, APIs and enterprise systems. Modern .NET runs on Linux, macOS and Windows, is open source, and gets a long-term support release every two years. It is a natural fit if your company already uses Microsoft tools or Azure.

Do .NET applications need Windows servers?

Not any more. Applications on modern .NET run on Linux servers and in Docker containers, which are often cheaper to host. Only applications still on .NET Framework, or desktop apps built with WPF or WinForms, need Windows.

Should we hire a .NET developer or a .NET development company?

One developer suits a contained task if you already have a tech lead to review the code. A company makes sense when you need several skills – architecture, front end, testing, DevOps – or continuity when someone leaves.

How do I find a .NET development company on Sortlist?

Compare firms by rating, published .NET projects, reviews describing .NET work, budget and location, then shortlist three to five and run the vetting call above with each. You can also post your project for free and get matched with qualified firms.