All .NET Development Companies in Cologne
lise GmbH
5(1 review)Software & AI solutions for growing demands - We make your ideas grow
Top awardedFor over 26 years, lise GmbH has been a provider of individual software development and AI solutions from Cologne. The tailor-made applications are characterized by the use of the latest technologies, the highest quality, and not least by the creative ideas of our over 80 employees. As a Microsoft Partner, we have certified developers who can be used to support your internal development team or take over the outsourcing of complex projects for your company. We work with AI support and agilely on your products. Because this allows us to deliver high-quality products to you in the shortest possible time.Looking for work in .NET DevelopmentLocated in Cologne, GermanyFrom €3,000 for .NET DevelopmentWorked in Telecommunications (+6)Speaks English, German51-200 membersInstinctools
5(10 reviews)Your AI-powered Engineering Partner
Top awardedMeet *instinctools - a global AI-powered software engineering company with over 25 years of experience. We help both SMBs and Enterprises build robust, scalable software solutions that excel in functionality and design. Our core services include: Agentic AI enablement Custom software development enhanced by deep AI expertise Digital product engineering Business process automation Legacy system modernization Advanced data analytics and visualization Cloud infrastructure and DevSecOps Headquartered in the USA (Maryland) and Europe (Germany), *instinctools offers convenient locations for meeting and collaborating directly with our clients. We have development centers in Poland, LATAM, India, and Kazakhstan that combine global expertise with a strong price-quality balance to ensure exceptional results across time zones. Our work is backed by ISO-certified quality standards, strategic partnerships with leading tech platform, and a long-standing commitment to engineering excellence. Instinctools holds a broad portfolio of regional and industry-specific certifications, including CIR, HIPAA, and other compliance frameworks required for regulated markets. The 2025 Annual Customer Satisfaction Index is 9.1 out of 10.Looking for work in .NET DevelopmentLocated in Stuttgart, Germany (+4)From €10,000 for .NET DevelopmentWorked in Construction (+10)Speaks English, German(+1)201-500 membersDesigndialog GmbH & Co. KG
5(8 reviews)We take care of the ground on which new things can emerge.
Top awardedDesigndialog – Making knowledge visible, enabling change Designdialog is a Cologne-based agency for communication design, strategy, and development with a clear mission: We combat knowledge loss in organizations and create the fertile ground for sustainable change. The problem we solve: Knowledge loss is one of the biggest hidden cost factors in companies. Employees spend 24% of their working time searching for information, replacing management positions costs up to 200% of the annual salary, and valuable knowledge is irretrievably lost upon departure. Our approach: We focus on continuous dialogue instead of isolated actions. Through visual communication, structured knowledge transfer, and people as multipliers, we make complex content understandable and sustainably usable. Our services: Analysis and preparation of content Visual maps for processes and structures (Big Pictures) Workshop and seminar formats (incl. Design Thinking) Communication strategies and presentation design Development of digital platforms Sparring and coaching Our team: Owner-managed and interdisciplinary, we combine untamed creativity, scientific rigor, and clear structure. Four people, three generations, one goal: strengthening organizations through knowledge. Our values: We listen, focus on deep dives instead of buzzwords, work at eye level, and promote cooperation instead of competition. Honesty and sound expertise shape our collaboration.Looking for work in .NET DevelopmentLocated in Cologne, GermanyFrom €4,800 for .NET DevelopmentWorked in Hospitals & Healthcare (+8)Speaks German, English1-10 membersBerlin Bytes
4.9(20 reviews)Digital Products & Customer Platforms | Internal Operations Platforms | AI, Agents & Bots
Top awardedWe are the partner for digital transformation for companies of all sizes. Through strategic consulting and technology solutions at all levels: From conception to implementation, we develop customer platforms, optimize internal operations platforms, and integrate future-oriented AI. We combine strategy, design, and technology into tailor-made solutions: from websites and e-commerce platforms to complex software systems, web and mobile apps.Looking for work in .NET DevelopmentLocated in Berlin, GermanyFrom €3,000 for .NET DevelopmentWorked in Entertainment & Events (+15)Speaks English, French(+2)51-200 membersChudovo OÜ
5(22 reviews)Complex Systems Implementation
Highly recommendedTop awardedChudovo is a custom software development company, focused on complex systems implementation. Customers rely on our expertise, appreciate transparency in time, budget, visibility of work progress, and our assistance in achieving their business objectives with high-quality solutions. Our teams follow best development practices and methodologies and apply their experience in such industries as healthcare, finance, e-commerce, logistics, telecommunications, and others. In our portfolio, we have over 190 successfully implemented web, mobile, desktop, cloud, embedded, and AI projects. With our commitment to innovation, we bring together cutting-edge technologies, visionary strategies, and creative minds to breathe life into your visions and ideas.33 works in .NET DevelopmentLocated in Castrop-Rauxel, Germany (+4)From €3,000 for .NET DevelopmentWorked in Hospitals & Healthcare (+19)Speaks English, German(+2)51-200 membersTechwerk GmbH
5(9 reviews)We develop and design digital innovations that inspire.
Our agency specializes in the conception, design, and development of digital products. Our team consists of experienced designers, developers, and project managers who are distinguished by their passion for technology and creativity. We work closely with our clients to understand their business goals and develop tailor-made solutions. Our services include the development of websites and applications, the conception of user interfaces, the creation of graphics and animations, and the development of marketing strategies. Our goal is to create unique and engaging digital experiences that offer added value to users and help our clients achieve their goals. We are proud to offer our clients a comprehensive service that ranges from conception to implementation. Our projects are characterized by our high quality standards and are carefully planned, developed, and tested by our experienced team. We work agile and flexibly to ensure that we always use the latest technologies and methods to achieve the best possible results. We look forward to working with you and creating something great together!Looking for work in .NET DevelopmentLocated in Cologne, GermanyFrom €1,000 for .NET DevelopmentWorked in Logistics & Supply Chain (+12)Speaks English, German11-50 membersSheydin Studio
(0 review)Digital Products from Requirements to Release.
Sheydin is a design studio based in Cologne, specializing in the design of user interfaces for complex applications. Our work focuses on understanding processes in depth and developing clear interaction flows. We also design information systems and create distinctive visual identities.Looking for work in .NET DevelopmentLocated in Cologne, GermanyFrom €1,000 for .NET DevelopmentWorked in Marketing & AdvertisingSpeaks English, German1-10 membersiseo Digitalagentur
4.8(10 reviews)Implement innovation easily – with digital solutions that work.
Highly recommendediseo is your partner for individual app, web, and software development as well as for practical AI consulting, automation, and integration. Since 2008, we have been developing digital products that simplify processes, strengthen business models, and sustainably advance companies. Our interdisciplinary team combines technological expertise with creative thinking and strategic understanding. From the initial idea through conception, UX/UI design, and development to operation, maintenance, and further development, we support digital projects holistically. This results in tailor-made web applications, apps, portal solutions, and software systems that precisely match our clients' requirements. A special focus is on the use of Artificial Intelligence: We advise companies on meaningful AI use cases, automate recurring processes, and integrate intelligent solutions into existing systems. Whether it's a new digital vision, an ongoing project, or a specific challenge: we make digital innovation understandable, usable, and successful. Our services: Individual app development Web development for modern websites, web portals, and digital platforms Custom software development AI consulting for identifying meaningful use cases and potentials AI automation for increasing efficiency and process optimization AI integration into existing systems, workflows, and applications UX/UI design for user-friendly and conversion-strong digital products Consulting, conception, and strategy for digital projects Online marketing for visibility and digital customer acquisition iseo – where technology, creativity, and the future come together. Contact us easily: www.iseo.de / info@iseo.deLooking for work in .NET DevelopmentLocated in Lübeck, GermanyFrom €1,000 for .NET DevelopmentWorked in Others (+12)Speaks German, English11-50 membersSPRYLAB
4.9(24 reviews)Development of platforms, apps & AI solutions for large & medium-sized companies
Top awardedSPRYLAB is a leading IT partner for custom platform, app, and AI solutions. Our in-house team of over 70 developers, designers, and strategists drives bold ideas and pioneering software solutions to guide large and medium-sized companies into the digital present. Since 2007, over 120 companies from 5 countries have entrusted us with their trickiest software projects. With particular expertise in the healthcare, media, automotive, and sports industries. SPRYLAB serves clients such as Deutsche Bahn, Sodexo, Evonik, Daimler, Doctors Without Borders, University Hospital Heidelberg, Johanniter, Axel Springer, Bertelsmann, and the Basketball Bundesliga. 83% of our assignments come from recommendations. We are reliable and 100% transparent Why do our clients trust us with their most important projects? Because in over 16 years, we have never failed to deliver the results we promised. We advise you with holistic foresight We have seen the inside of almost 100 companies and know what causes software projects to fail. That's why we analyze your IT infrastructure and workflows and help you meet all the requirements. We are the sparring partner you are looking for Great products that last for decades are developed as a team. As an equal partner, we challenge mediocre ideas and bravely speak uncomfortable truths. We solve problems and invent the future We believe that with software, (almost) nothing is impossible. Our software engineers love to take on the trickiest and boldest tasks and solve complex challenges. We work quickly, agilely, and cost-effectively Our project teams know: Speed and quality are trump cards in software development. With prototyping, wireframing, and short iteration cycles, you can quickly bring a mature product to market and expand it. Contact: More efficiency, revenue, or digital momentum through digitalization? Contact us. If you are looking for an IT service provider with whom you want to grow together, we are the right partner. hello@sprylab.com +49(0) 30 166 342 51 www.sprylab.com/en/Looking for work in .NET DevelopmentLocated in Berlin, Germany (+1)From €5,000 for .NET DevelopmentWorked in Publishing (+11)Speaks English, German51-200 membersTRIBOOT Technologies GmbH
5(1 review)Modern App & Software Development for Startups & SMEs — AI Development — fast, secure, market-ready.
TRIBOOT Technologies develops modern high-quality & custom iOS, Android, and Virtual Reality apps for startups, SMEs, and industrial companies. We help companies implement digital products faster, more securely, and more professionally — from the initial idea through UX/UI, software architecture, and development to the market-ready solution. We specifically use AI as an accelerator in the development process: for more efficient planning, faster implementation, better quality assurance, and well-founded technical decisions. Our focus is on software that not only looks good but also functions reliably in real-world operation. That's why we pay attention to security, data protection, performance, scalability, code quality, and long-term maintainability from the outset. We support both new projects and app and software developments that have already started. Whether it's an MVP, an internal platform, a digital process solution, an existing application, or a technical realignment — we help to identify risks early on, create the right technical foundation, and professionally bring software to market readiness. Our services: • App and web development • Custom software development • UX/UI design for digital products • Software architecture & technical product strategy • Analysis and optimization of existing applications, including AI-developed ones • Launch preparation, scalability & quality assurance Our claim: Software development that is accompanied understandably, implemented efficiently, and safely brought to market readiness — supported by the targeted use of AI.Looking for work in .NET DevelopmentLocated in 45, GermanyFrom €3,000 for .NET DevelopmentWorked in Industrial Goods & Services (+9)Speaks German, English1-10 membershafencity.dev GmbH
4.9(12 reviews)Your complete partner for modern web & mobile apps.
Highly recommendedWe are your partner for the conception, development, and scaling of modern web and mobile apps . Our full-service approach covers all phases of a digital product: from strategic alignment and UX/UI design to development, quality assurance, launch, and ongoing enhancement. Our strength lies in the combination of product thinking and technical excellence : we question requirements, prioritize features together, and translate them into robust web and mobile architectures. Instead of colorful presentations, we deliver clear roadmaps, reliable timings , and solutions that stand the test of everyday use – whether as an MVP, a complex platform product, or a long-term evolving app landscape. With numerous successful app and web projects , we know exactly what it takes to develop and operate digital products: clean architecture, high code quality, clear roadmaps, and transparent communication. This experience flows into every new project – with the aim of building the best solution for your product . You have an idea, we have the team for it. Write or call us – together we will sharpen your vision and develop a web or mobile app that impresses in everyday use. 📧 hauke@hafencity.dev 📞 +49 40 18030691 💻 www.hafencity.devLooking for work in .NET DevelopmentLocated in Hamburg, GermanyFrom €5,000 for .NET DevelopmentWorked in Software & Computer Services (+10)Speaks English, German11-50 membersQubix Consulting GmbH
4.8(11 reviews)Shaping digital transformation – measurable & successful
RecommendedAt Qubix, digital experts, industry specialists, and entrepreneurs work hand in hand to make your processes efficient, automated, and sustainable. We understand your business model and corporate culture so that solutions directly impact your KPIs . Our focus: long-term added value, fast ROI, measurable results . What we do for you Digital Transformation & Process Optimization Change Management & Organizational Consulting Automation & Software-supported Processes Subsidy Consulting & Subsidy Check Strategic Consulting & Project Implementation Why Qubix? Over 25 years of experience in digital projects Strong network of start-ups, companies, and investors Practical approach: Results instead of theories Personal support & sustainable partnershipLooking for work in .NET DevelopmentLocated in Eschborn, GermanyFrom €1,000 for .NET DevelopmentWorked in Hospitals & Healthcare (+4)Speaks English, German11-50 membersCom&Sons GmbH
4.9(8 reviews)COMMUNICATE WITH EACH OTHER, FIND SOLUTIONS TOGETHER
RecommendedTop awardedThe Path of Pioneers In the last 15 years, forms of communication have changed radically. And this at a speed that marketing and sales in many companies hardly have a chance to adapt to this change. We live in a networked world in which marketing measures can no longer be viewed separately from one another – but must be linked together. In order to highlight the special qualities of your company, we can draw on a widely branched system of experience and qualifications. We are specialists in the areas of corporate design, live communication, digital marketing, film & photo production and IT & e-commerce and even better at harmonizing them with each other.Looking for work in .NET DevelopmentLocated in Hamburg, GermanyFrom €1,000 for .NET DevelopmentWorked in Non-profit (+8)Speaks English, German11-50 membersFuture Processing
(0 review)Transform your ambitions into measurable outcomes
We are a tech strategy advisor and tech delivery partner with 25+ years of experience. With our consulting mindset and domain expertise in insurance, finance, media, energy & utilities, we are obsessed with transforming your business ambitions into measurable results . We proceed according to unique, AI-enabled advisory & delivery framework grounded in technological heritage, AI roots and continuously optimised to deliver faster. We design our solutions on the basis of clients’ technology foundations and data infrastructure with high quality, governance and compliance standards to scale safely. We can modernise even complex, legacy systems and operate in regulated industries. We are committed to delivering business value so we agree upfront on a defined outcome, a measurable milestone or a capability you can use. Not every idea deserves a delivery budget, and the fastest way to waste one is to start building before you know what's worth building. When the board wants AI results but nobody's sure where to start, see our AI Readiness Assessment When the cloud bill keeps climbing and no one can quite explain why, see our FinDataOps Discovery And when you already have an idea but no business case or roadmap to act on it, see our Value Prototype Sprint The point is simple: y ou reach the build stage with a validated decision and your budget still intact. Once the direction is set, the work shifts to delivering production software and keeping it dependable long after go-live. If your direction is validated and you need production-grade software fast, see our Rapid Delivery Milestone And once a business-critical application is live, our Support & Maintenance We assist clients with AI & ML, Cloud, Consulting, Cybersecurity, Data Solutions, Digital Product , and Software Development . Still not sure where to start? Tell us what you’re trying to achieve, and we’ll tell you how we can help. Get to know us better here: www.future-processing.comLooking for work in .NET DevelopmentLocated in Düsseldorf, Germany (+4)From €1,000 for .NET DevelopmentWorked in Legal ServicesSpeaks English, German(+1)501-1000 membersmaexware solutions GmbH
5(4 reviews)maexware – Your key to digital success and solving IT challenges!
We are your partner for all aspects of web and software development! Our expertise includes digitalization, IT support, and innovative ERP, e-commerce, and CRM solutions. As a partner for digital and commercial solutions, we offer tech innovations and a comprehensive IT competency pool.Looking for work in .NET DevelopmentLocated in Freiburg, GermanyFrom €250 for .NET DevelopmentWorked in Energy & Oil (+5)Speaks English, German11-50 membersUASOFTDEV
5(2 reviews)Founder-led staff augmentation of AI-Ready Senior Developers and Dedicated Teams in 60 hours
UASOFTDEV is a founder-led staff augmentation of AI-Ready Dedicated Teams and Senior Software Engineers for small-mid companies. We believe AI doesn't replace experienced engineers. It makes the right engineers dramatically more effective. That's why every developer we provide uses AI as part of their daily workflow with tools like Claude, Cursor and GitHub Copilot, while all architecture, technical decisions, code reviews and production releases remain under experienced human ownership. Main engagement models. Staff Augmentation for companies looking to extend their existing engineering team with senior talent, and AI-Ready Dedicated Teams for businesses that need a complete delivery team with technical leadership capable of owning products, features or entire engineering initiatives. Every engagement is led directly by our Founders. Aleksey, CEO, works closely with clients to understand product goals, business priorities and team dynamics. Oleksandr, CTO, personally evaluates every engineer for technical excellence, communication and problem-solving skills. Our work is built around four core values: quality, clarity, transparency and a personalized approach to every client engagement. The process is simple: after a discovery call, we match engineers to your technology stack, product domain and culture, present a CTO-vetted shortlist and run contracting alongside onboarding. Staffing typically happens within 60 hours. Today, our teams support startups and product companies across Europe, UK and North America. UASOFTDEV's track record includes a 97% first-candidate acceptance rate, a 95.65% first-match success rate and an average client engagement of over 13 months. Founders respond to critical issues within two working hours. Whether you need one senior engineer or an AI-Ready Dedicated Team, our goal is the same: help you ship faster with engineers who communicate clearly, contribute from day one and solve complex problems independently.Looking for work in .NET DevelopmentLocated in Berlin, Germany (+4)From €10,000 for .NET DevelopmentWorked in Beauty (+2)Speaks English11-50 membersELEKS
5(1 review)Your trusted partner for guaranteed software delivery
Top awardedELEKS is your trusted partner for guaranteed software delivery. Combining over 30 years of industry insight with cutting-edge AI technology, we help businesses worldwide deliver their unique software vision through bespoke full-cycle solutions.Looking for work in .NET DevelopmentLocated in Berlin, Germany (+14)From €20,000 for .NET DevelopmentWorked in Energy & Oil (+10)Speaks English, German(+1)1001-5000 membersGoPassion GmbH
4.8(6 reviews)GoPassion – Digital Product Builder for the Mid-Market
We build digital products people talk about – for mid-sized companies that don't have time for mediocrity. You are the CEO of an SME. You have a product idea – perhaps even a pretty good one. But you don't have a team to turn it into a functional, scalable product. That is exactly why we exist. Most agencies build beautiful software that nobody needs. Most venture builders only build their own ventures. With your money. For equity. We are different. We are four founders with our own exits and corporate experience (Siemens, SAP, Deutsche Telekom). We treat your product like our own – because we know how it feels when everything is at stake. What we do for you: → Validate your idea before we write a single line of code → Only build features with a real business case → Develop scalable architecture from day 1 → Deliver a working product in 3-6 months What remains with you: Marketing, Sales, Customer Success. Our process: Understand (4-6 weeks) → Validate prototype (2-4 weeks) → Develop (8-12 weeks) → MVP Launch -> Pivot or Scale What sets us apart: ✓ Four senior founders, no junior team ✓ 200+ developer network – flexible, no payroll costs ✓ Business-first: "What generates money?" instead of "What is cool?" ✓ MVP in 90 days – guaranteed Who this is NOT for: ❌ Website projects, logo redesigns, marketing campaigns Who this IS for: ✅ SME CEOs with digital product ideas ✅ Mid-sized companies without their own product organization ✅ Looking for a partner who takes responsibility Typical project: €60k-€250k | 3-6 months Comparison: Building your own senior team = €365k/year + 18 months. Or: 6 months with us = finished product. Next step: 25-min Strategy Call (free). No sales pitch. Just honest sparring. If it's not a fit, we'll tell you. Team: <10 people Previously: CodingPassion GmbHLooking for work in .NET DevelopmentLocated in Raubling, GermanyFrom €7,400 for .NET DevelopmentWorked in Energy & Oil (+6)Speaks English, German11-50 memberskalkyl
5(1 review)Exceptional Software. Beautifully Made.
Calculated by name. Calculated by nature. We exist because we understood something most dev agencies don't: good software isn't a tech project — it's a business project. The question was never "What can we build?" but "What's worth building, and why?" That economic lens is kalkyl's core. We calculate the ROI for our clients before we write a single line of code. Since 2018, our now 13-person team in Nürnberg has built custom web and software solutions for over 100 clients — from Siemens, ver.di and the Metropolregion Nürnberg to "Mittelstand" companies, startups and public sector organisations. Our work typically includes: Client portals & self-service platforms Custom SaaS products AI integrations & internal AI tools Complex web applications Exceptional UX design What makes us different: Honestly? We're weird. Our developers spot an inconsistent border-radius before they notice you've entered the room. Our strategists will question your business case before they ask your name. That obsessive precision is the product. It's why our software ships clean, scales well, and doesn't need duct tape six months later. What it's like working with us: Full owner access to GitHub from day one Full access to Figma -> review, comment on, and follow every design decision live Daily deployments to a staging environment you can test yourself Daily async progress updates in your Slack or Teams A designated project manager Linear access with transparent time tracking 4-eyes code review on every pull request Documentation and handover that lets you switch teams tomorrow if you want to. You won't want to, but you could ;) Sounds like the partner you've been looking for? Let's do the math.Looking for work in .NET DevelopmentLocated in Nuremberg, GermanyFrom €2,000 for .NET DevelopmentWorked in Utilities (+5)Speaks English, French(+1)11-50 membersAndersen
4.8(23 reviews)Take the software path to your digital future
Highly recommendedTop awardedAndersen – Your Trusted Software Development Partner in Europe With over 18 years of expertise, Andersen empowers European companies to achieve digital transformation through tailored software solutions. Based in Poland, we operate development centres across Germany, the UK, Ireland, Hungary, Georgia, Cyprus, and Lithuania. We provide end-to-end IT services and consulting — from custom software development and API integration to system migration and legacy system modernisation. Our team also offers long-term support and optimisation to maximise the value of your solutions. At the forefront of digital transformation, we leverage advanced technologies, including AI, Machine Learning, Data Science, Big Data, and Visual Technologies, to create secure and scalable solutions that address complex business challenges. Recognised among the world’s top 1,000 B2B service providers, Andersen collaborates with industry leaders like Samsung, Mercedes-Benz, Siemens, T-Systems, ZDF Digital, and others. With a team of 3,700+ professionals across 16 locations, we’ve successfully delivered over 1,000 projects for clients in industries such as finance, healthcare, manufacturing, automotive, aerospace, and energy. We prioritise quality, business impact, and lasting partnerships. If you’re looking for a dependable tech partner in Europe, let’s shape the future of your business together.1 work in .NET DevelopmentLocated in Berlin, Germany (+9)From €10,000 for .NET DevelopmentWorked in Technology Hardware & Equipment (+24)Speaks English, Dutch(+4)1001-5000 members