Net Developer Jobs in London, UK

About The Role DM is a global business and technology consultancy seeking a Senior .NET Software Developer to work for our client within the Public Sector sector. This is initially a 6 month contract with very good prospects to extend and will be a hybrid role based in either London Bristol, Liverpool, Manchester, Leeds, Birmingham and Newcastle. Our client is seeking an experienced Senior .NET Software Developer to lead the design and delivery ...

We believe in better. And we make it happen. Better content. Better products. And better careers. Working in Tech, Product or Data at Sky is about building the next and the new. From broadband to broadcast, streaming to mobile,SkyQto Sky Glass, we never stand still. We optimise and innovate. We turnbig ideasinto the products, content and services millions of people love. And we do it all right here at Sky. This is an exciting opportunity to join...

Senior C# / .NET Developer | Risk & Securities Lending Location: London (Hybrid) Contract Duration: 6 Months Industry: Financial Services About the Opportunity Are you a seasoned C# engineer with a deep understanding of financial markets? We are seeking an experienced Senior C# / .NET Developer to join a high-performing technology team supporting critical Risk Management and Securities Lending platforms. In this 6-month hybrid contract, you ...

Your New Role I'm currently working with a London-based Financial Services client who are looking to bring in a Principal .Net Developer to develop and maintain a range of business-critical applications as a hands-on leader. What you'll need to succeed : Extensive hands-on .Net development experience within investment banking or investment management Proven experience as a principal/lead developer, leading and mentoring junior developers Strong ...

Contract .NET Developer - 350- 375p/d - Outside IR35 - London / Hybrid (.NET Developer, .NET Software Engineer, Software Developer, C#, .NET, SOLID principles, SQL Server, HTML, CSS, Blazor, Angular, Unit Tests, DevOps, CI/CD pipelines, Terraform, Azure, AI tools) Established in the 1990s our client is one the fast growing technologies brands across Europe. They have built an unrivalled reputation for developing revolutionary .NET / C# software ...

Join Our Amazing Investment Banking Client as a Senior / Lead C# .Net Developer! Location : Canary Wharf (3 days per week onsite) Contract Duration: Up to 2 years! Umbrella Rate : 400- 600 Umbrella Day Rate Interviews: ASAP, first interview is in person this is essential. Please Note: If you have spoken to a member of the Pontoon/Adecco team within the last month about our other C# Software Development roles, you do not need to apply again. Are ...

Contract .NET Developer - 350- 375p/d - Outside IR35 - London / Hybrid (.NET Developer, .NET Software Engineer, Software Developer, C#, .NET, SOLID principles, SQL Server, HTML, CSS, Blazor, Angular, Unit Tests, DevOps, CI/CD pipelines, Terraform, Azure, AI tools) Established in the 1990s our client is one the fast growing technologies brands across Europe. They have built an unrivalled reputation for developing revolutionary .NET / C# software ...

C# / .NET Developer – Front Office, Electronic & Low Latency Trading Systems Join MARGO in the UK (London) – Perm & Contracting Opportunities   MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry. We specialise in complex software engineering environments where performance, robustness and scalability are critical: real-time systems, low-latency architectures, distributed computing and high-throughput data processing. Joining MARGO means working in demanding Front Office and Trading IT environments, while benefiting from a human-sized structure, close follow-up and tailor-made training paths.   Business Context You will join the Front Office / Trading IT environment of one of our tier-1 investment banking or trading partners. The teams design and maintain mission-critical C# / .NET systems supporting electronic trading, real-time risk and analytics platforms across multiple asset classes (Equities, Fixed Income, Commodities, FX, Derivatives). These systems operate close to trading desks and electronic trading platforms, with strong constraints on performance, reliability and production stability. The environment is characterised by: ·        Real-time and event-driven architectures ·        Low-latency and high-throughput processing requirements ·        Strong production and stability constraints ·        Close interaction with trading, quantitative and risk teams ·        High engineering standards and short delivery cycles   Role Overview We are looking for an experienced C# / .NET Developer to work on real-time, electronic trading and risk systems. The role is primarily technical and engineering-driven, focused on performance, scalability and robustness rather than business analysis. Candidates are expected to have prior exposure to Front Office, Trading or Risk environments, regardless of the underlying asset class. Key Responsibilities Design & Development ·        Design, develop and maintain high-performance C# / .NET applications ·        Work on real-time data processing including market data, pricing, orders, analytics and risk calculations ·        Implement concurrency and parallel programming patterns adapted to performance-sensitive systems ·        Participate in system design, architecture discussions and technical specifications ·        Continuously optimise performance including latency, throughput and memory usage Engineering & Delivery ·        Contribute to the full software lifecycle: design, development, testing and release ·        Produce clean, maintainable and well-tested code ·        Participate in sprint planning, estimations and technical reviews ·        Collaborate closely with developers, quant and infrastructure teams Production & Support ·        Provide 3rd line support on production systems when required ·        Participate in production releases including occasional out-of-hours interventions ·        Contribute to system stability, monitoring and incident prevention Technical Environment Core Technologies ·        C# / .NET (expert level)  - Concurrency and parallel programming  -  Asynchronous and multithreaded models  -  Memory management and performance profiling ·        Distributed and event-driven architectures ·        Windows and/or Linux production environments ·        Performance monitoring and profiling tools Valued Technical Exposure ·        Electronic trading or low-latency trading systems ·        High-throughput or real-time architectures ·        Messaging middleware (Kafka, Solace or equivalent) ·        FIX or other market connectivity protocols ·        RESTful or service-oriented architectures ·        High Performance Computing (HPC) or grid computing concepts Required Experience & Skills Essential ·        Strong experience as a C# / .NET Developer in performance-sensitive environments ·        Proven background in real-time or high-throughput systems ·        Solid understanding of concurrency, parallelism and memory optimisation ·        Experience working in Front Office, Trading or Risk IT environments ·        Strong production mindset and system ownership ·        Clear communication and structured problem-solving skills Valued (but not restrictive) ·        Exposure to electronic trading platforms or low-latency environments ·        Experience across one or more asset classes (Equities, Fixed Income, Commodities, FX, Derivatives) ·        Familiarity with distributed, grid or event-driven systems ·        Interaction with C++ low-latency or HFT-adjacent components Why Join MARGO ·        Access to multi-asset Front Office, Trading and Electronic Trading environments ·        Highly technical and challenging engineering assignments ·        Clear positioning between HFT and non-HFT trading systems ·        Strong emphasis on skill development and long-term career progression ·        Human-sized consultancy with close support and high-quality missions Please note - We do not offer visa sponsorship for this position.   Interested? Motivated? Apply on our website or at staff.uk@margo.com

Join MARGO in the UK (London) MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry. We specialise in complex software engineering environments where performance, robustness, and scalability are critical: real-time systems, low-latency architectures, and high-throughput data processing Joining MARGO means working in demanding Front Office and Trading IT environments while benefiting from a human-sized structure, close follow-up, and tailor-made training paths. Business Context You will join the FX Risk IT environment of a leading tier-1 investment bank. The team is responsible for designing and maintaining mission-critical systems supporting FX Cash (Forward, Swap, NDF) and FX Derivatives (Options, Carbon Offsets). The environment is built around the Orchestrade vendor platform and involves close collaboration with traders, quants, and risk managers to deliver high-performance trading solutions. Role Overview We are looking for a Senior C# / .NET Developer with a strong technical background to lead the development and integration of FX trading solutions. While expertise in the Orchestrade platform is highly desirable, we are primarily seeking a high-caliber engineer who can master complex vendor APIs and provide technical leadership within a fast-paced, agile culture. Key Responsibilities Design & Development - System Evolution: Analyse, design, and develop high-performance C# solutions for FX cash and derivative products. - Orchestrade Integration: Develop code to integrate Orchestrade with connected internal systems such as Sigma, Barracuda, and Deal Hub. - Architecture: Advise on the best architectural approaches for integrating vendor products with service-oriented and micro-services concepts. - Data & Middleware: Design clean interfaces and manage data flow using SQL and messaging middleware. Engineering & Mentoring - Technical Leadership: Provide mentoring and guidance to other developers on C# best practices and FX business logic. - Delivery Ownership: Take ownership of specific project deliveries, applying agile methodologies and project management skills where required. - Quality Standards: Drive high engineering standards through continuous integration and DevOps practices. Production & Support - Level 3 Support: Provide expert-level support for production Orchestrade systems and connected FX IT platforms. - System Controls: Ensure all developments comply with internal systems, controls, and regulatory requirements. Technical Environment & Skills Essential Experience - Expert C# / .NET: Substantial experience in software development with deep knowledge of the .NET ecosystem - Investment Banking: Prior experience working in a Front Office environment alongside traders, quants, or risk managers. - Backend & Middleware: Strong understanding of SQL/RDBMS and messaging middleware. - Architecture : Solid grasp of service-oriented and micro-services design concepts. Valued Technical Exposure (Desirable) - Orchestrade: Strong experience with Orchestrade features, configurations, and APIs. - FX Domain: Knowledge of FX Forward, Swap, NDF, and FX Options/Derivatives. - Cross-Platform: Experience with C++, Java, or FIX protocol. - Other Vendors: Familiarity with Calypso, Murex, or similar trade management products. Why Join MARGO Tier-1 Exposure: Work at the heart of FX Risk IT for a major global bank. Technical Growth: Highly challenging assignments bridging vendor platform expertise and bespoke C# engineering. Career Progression: Clear paths for technical leadership and architectural ownership. Mentorship Culture: Benefit from and contribute to a high-quality peer-review and mentoring environment. Please note: We do not offer visa sponsorship for this position. Interested? Motivated? Apply on our website or at staff.uk@margo.com

Join Our Amazing Banking Client as a C# .Net Developer! Location : Canary Wharf (3 days per week onsite) Contract Duration: Up to 2 years! Umbrella Rate : 400 - 490 Per Day (Based on experience) Interviews: ASAP, first interview is in person this is essential. Are you a passionate C# .Net Developer looking for an exciting opportunity in a leading banking Institution? Look no further!We are seeking a talented individual to join our dynamic team b...

C# .NET Developer - Global Investment Bank - London My client, a leading global bank is looking for a C# .NET Developer to join its technology team in London, supporting critical business applications used across international markets. This is a hands-on role focused on desktop application development (WPF / WinForms) combined with ongoing production support and enhancements. Key Responsibilities Develop and maintain C# .NET desktop applications...