276 to 300 of 365 C# Jobs in the City of London

farm economics, productivity, and environmental impact . Key Responsibilities Lead technical strategy and oversee architecture for scalable, data-driven systems. Remain actively hands-on , designing and developing high-performance C#/.NET back-end systems . Mentor and guide a growing team of developers — setting technical standards and driving best practices. Oversee end-to-end solution delivery, ensuring performance, security … a Back-End Developer/Engineering Lead/CTO in data-heavy environments Demonstrable history of technical excellence and leadership in commercial software development Technical Expertise Advanced proficiency in C#/.NET Core/.NET Framework Strong command of Azure Cloud Services Deep experience with SQL Server and high-volume transactional systems Expertise in data architecture, performance optimisation , and scalable More ❯

farm economics, productivity, and environmental impact . Key Responsibilities Lead technical strategy and oversee architecture for scalable, data-driven systems. Remain actively hands-on , designing and developing high-performance C#/.NET back-end systems . Mentor and guide a growing team of developers — setting technical standards and driving best practices. Oversee end-to-end solution delivery, ensuring performance, security … a Back-End Developer/Engineering Lead/CTO in data-heavy environments Demonstrable history of technical excellence and leadership in commercial software development Technical Expertise Advanced proficiency in C#/.NET Core/.NET Framework Strong command of Azure Cloud Services Deep experience with SQL Server and high-volume transactional systems Expertise in data architecture, performance optimisation , and scalable More ❯

C# Data Engineer - Data Projects. Greenfield. Energy Trading. 6 month rolling contract.£700/Day inside IR35. 2 Days a week Hybrid in Central London. My client is a top tier energy trading firm that is looking for a strong C#/SQL/Azure back end Engineer to come on board on a 6 month rolling contract. The Data More ❯

Introduction Saab in UK is growing rapidly, with over 500 colleagues across eight sites. We bring together Swedish heritage and British expertise to drive innovation in areas such as software engineering, underwater robotics, radars, AI, and armed forces training. Joining More ❯

Full Stack | Angular | C# | .NET | Energy Trading | £750/Day OUTSIDE IR35 | 6-month rolling | Hybrid | LDN Our client is looking for a C# .NET Engineer for a 6-month rolling project, working at a leading Energy Trading house. This client deals in both physical and non-physical Energy products as well as trading Commodities. They have recently seen a … add head count to their operations and trading team to enhance the Energy trading capability within the company. This has resulted in the need for this Full Stack Angular C# .NET developer to join them as they enhance their energy trading desk within the company. This developer will be needed to come into the team as an established Energy Trading … well as leading and upskilling peers around them. Having previous trading experience in the Energy Trading space is going to be essential for this role. This Full Stack Angular C# .NET engineering role is: 💸 This role is paying up to £750/day Inside IR35 💻 This hybrid role is 3 days in office 📍 The office is in Central London Technology More ❯

Full Stack | Angular | C# | .NET | Energy Trading | £750/Day OUTSIDE IR35 | 6-month rolling | Hybrid | LDN Our client is looking for a C# .NET Engineer for a 6-month rolling project, working at a leading Energy Trading house. This client deals in both physical and non-physical Energy products as well as trading Commodities. They have recently seen a … add head count to their operations and trading team to enhance the Energy trading capability within the company. This has resulted in the need for this Full Stack Angular C# .NET developer to join them as they enhance their energy trading desk within the company. This developer will be needed to come into the team as an established Energy Trading … well as leading and upskilling peers around them. Having previous trading experience in the Energy Trading space is going to be essential for this role. This Full Stack Angular C# .NET engineering role is: 💸 This role is paying up to £750/day Inside IR35 💻 This hybrid role is 3 days in office 📍 The office is in Central London Technology More ❯

My Financial Services client is seeking to recruit a C# .NET Developer on an initial 6 month contract based in London. It is hybrid and will require 3x days onsite per week. Essential: Strong background in C# programming and .Net technologies Strong Windows background Strong experience with relational databases and SQL Proven experience in continuous improvement of areas of focus … into application and operational requirements Good work ethic, with a focus on meeting deadlines and objectives Along with the application development, this role will also include supporting the existing C# and .NET applications. Strong hands-on skills for C# Windows applications is required. More ❯

Software Developer Key Technologies: C#, .NET, .NET Core, Azure, SQL London Perm Role | Hybrid Working Structure £50,000 - £60,000 Harrington Starr has partnered with a global Investment Bank who are looking to hire a seasoned Senior C# Developer with extensive experience developing from Back to Front Office trading systems. Key Responsibilities: Design, develop and maintain Front Office systems written … in C#, ,NET Collaborate closely with a variety of internal and external stakeholders around the globe from product managers to traders Developing with the existing systems technologies and integration with cloud based architecture (azure) Strong business knowledge with Post Trade systems Key Benefits: Competitive base salary up to £60,000 based on previous experience and domain knowledge Hybrid working structure More ❯

Software Engineer C#, .NET Core, NUnit, Postgres, AWS, Azure, Kubernetes, Docker. City of London, United Kingdom Perm Role: £65,000 - £80,000 Harrington Starr has partnered with a Global Financial Technology company, and they are looking to hire a Mid - Senior C#, .Net Software Engineer, with experience working with highly scalable and performant systems. This is a great opportunity to … base salary up to £80,000 based on experience. Funded additional training and development and certifications. Excellent bonus structure. What skills, experience and qualifications required: Strong commercial experience with C#, .NET Core. Experience working with cloud technology (Azure/AWS). Strong commercial experience working with highly scalable and high-performance systems. Excellent communication skills. Full, unrestricted right to work … in the UK. This role offers hybrid working, with an office location based in the City of London. This role will suit a Mid - Senior Software Engineer, with strong C#, .Net experience, having a direct impact from the get-go! For any additional questions, please contact me via LinkedIn or through email - ollie.bluck@harringtonstarr.com. If you feel this role is More ❯

build strong and effective relationships Have experience building and maintaining complex distributed systems Take a proactive approach to spotting problems and areas for improvement Skills & Experience Strong Knowledge of C# and SQL Experience building on Azure, GCP or AWS At least 5 years of experience building distributed systems Excellent communication skills Can inspire and lead a team Experience overseeing multiple … concurrent projects Tech Stack C# .NET Kafka Real time distributed systems High throughput Git Elastic stack If you are not an expert in these specific technologies but are familiar with an equivalent then we’re happy to train you. More ❯

build strong and effective relationships Have experience building and maintaining complex distributed systems Take a proactive approach to spotting problems and areas for improvement Skills & Experience Strong Knowledge of C# and SQL Experience building on Azure, GCP or AWS At least 5 years of experience building distributed systems Excellent communication skills Can inspire and lead a team Experience overseeing multiple … concurrent projects Tech Stack C# .NET Kafka Real time distributed systems High throughput Git Elastic stack If you are not an expert in these specific technologies but are familiar with an equivalent then we’re happy to train you. More ❯

Lead C# Engineer – Core Trading Systems - Global Multi-Asset Investment Firm - London - Up to £500k TC Our client is a globally recognized, multi-asset investment firm managing over $25 billion in assets on behalf of a major philanthropic foundation and select institutional partners. Operating as both a family office and institutional-grade asset manager, the firm combines the long-term … teams to deliver user-centric, high-performance applications. Contribute to the modernization of legacy systems by migrating infrastructure to AWS and Snowflake, improving scalability and maintainability. Develop solutions using C#, Python, SQL Server, and cloud-native tools, alongside modern UI frameworks such as React or Angular. Provide ongoing production support for mission-critical systems during trading hours and end-of … of a unified, scalable trade platform. Ideal Candidate Profile 5–10 years of experience developing and supporting Order Management (OMS) and Execution Management Systems (EMS). Strong proficiency in C# or Python, with advanced SQL and database design expertise. Hands-on experience with AWS, Snowflake, and modern software architecture. Solid grasp of data structures, concurrency, and memory management. Experience developing More ❯

FinTech projects. This is a backend-focused role, but familiarity with front-end tools like Angular is a nice-to-have. Key Responsibilities: Develop and maintain backend applications using C#, .NET, and Azure. Leverage Microsoft SQL Server services (database, integration services, reporting services) and write complex T-SQL stored procedures. Implement design patterns such as Factory, Adapter, and Chain of … database performance with database tuning (bonus). Participate in a hybrid working setup, spending 2 days per week in the office Essential Skills: Proven experience in backend development using C# and .NET frameworks. Strong expertise in Azure cloud technologies. Hands-on experience with Microsoft SQL Server services (database, integration services, reporting services). Advanced knowledge of T-SQL, including stored More ❯

maintainable code Contributing to architectural decisions that directly impact performance and reliability What we’re looking for Solid experience in software engineering with strong experience in Python, Java, or C# Proven track record of performance tuning in large-scale, distributed systems Expertise in profiling tools, memory management, and debugging complex performance issues Strong database optimisation skills (Postgres, SQL Server, or … to shape system architecture and mentor future engineering leaders Flexible Hybrid working in Central London up to £85,000 basic plus market leading bonus structures Tech Stack: Python, Java, C#, Postgres, Kubernetes, Docker, AWS, Azure, k6, JMeter, Gatling If you’re passionate about pushing the boundaries of performance engineering and building software that scales effortlessly, we’d love to hear More ❯

to architectural decisions that directly impact performance and reliability What we’re looking for A few years commercial experience in software engineering with strong experience in Python, Java, or C# Proven track record of performance tuning in large-scale, distributed systems Expertise in profiling tools, memory management, and debugging complex performance issues Strong database optimisation skills (Postgres, SQL Server, or … to shape system architecture and mentor future engineering leaders Flexible Hybrid working in Central London up to £85,000 basic plus market leading bonus structures Tech Stack: Python, Java, C#, Postgres, Kubernetes, Docker, AWS, Azure, k6, JMeter, Gatling If you’re passionate about pushing the boundaries of performance engineering and building software that scales effortlessly, we’d love to hear More ❯

to architectural decisions that directly impact performance and reliability What we’re looking for A few years commercial experience in software engineering with strong experience in Python, Java, or C# Proven track record of performance tuning in large-scale, distributed systems Expertise in profiling tools, memory management, and debugging complex performance issues Strong database optimisation skills (Postgres, SQL Server, or … to shape system architecture and mentor future engineering leaders Flexible Hybrid working in Central London up to £85,000 basic plus market leading bonus structures Tech Stack: Python, Java, C#, Postgres, Kubernetes, Docker, AWS, Azure, k6, JMeter, Gatling If you’re passionate about pushing the boundaries of performance engineering and building software that scales effortlessly, we’d love to hear More ❯

intelligence platform - spanning OBD diagnostics, API-based vehicle integrations, and real-time energy data streams. The Role We’re looking for a skilled Backend Developer with strong experience in C# and the .NET ecosystem to help us scale and evolve our core data and API infrastructure. You’ll play a central role in designing, building, and optimising services that power … scalability, and data integrity. Help evolve our internal tools and services to support ClearWatt’s growing product suite. What We’re Looking For 2+ years of professional experience with C# and .NET Core . Experience building REST APIs or microservices at scale. Familiarity with cloud-native design and Azure services . Understanding of async programming, dependency injection, and distributed systems. More ❯

intelligence platform - spanning OBD diagnostics, API-based vehicle integrations, and real-time energy data streams. The Role We’re looking for a skilled Backend Developer with strong experience in C# and the .NET ecosystem to help us scale and evolve our core data and API infrastructure. You’ll play a central role in designing, building, and optimising services that power … scalability, and data integrity. Help evolve our internal tools and services to support ClearWatt’s growing product suite. What We’re Looking For 2+ years of professional experience with C# and .NET Core . Experience building REST APIs or microservices at scale. Familiarity with cloud-native design and Azure services . Understanding of async programming, dependency injection, and distributed systems. More ❯

C#.Net, Data Driven | Fintech – Greenfield Event-Driven Data build | 12 Month contract roles | £700/Day OUTside IR35 C#.Net Core, engineers are needed for a new team in a Fintech client. The client are embarking on a transition from off More ❯

C#.Net, Data Driven | Fintech – Greenfield Event-Driven Data build | 12 Month contract roles | £700/Day OUTside IR35 C#.Net Core, engineers are needed for a new team in a Fintech client. The client are embarking on a transition from off More ❯

Senior C# Engineer | Renewable Energy Trading | £600-700 OUTside IR35 | 6 Months rolling | Hybrid (London) A Senior C# Engineer is required for a Renewable Energy Trading company that’s leading the charge in sustainable energy production, optimisation, and trading technology. With the UK committing over £24Bn to Renewable Energy , this is an opportunity to play a key part in the … the boundaries of technology to accelerate the shift to clean energy. 💰 £600–700 per day | OUTside IR35 📑 6-month rolling contract 📍 Hybrid – 2-3 days per week, London ⚡ Senior C# Engineer - Energy Trading experience required As a Senior C# Engineer , you’ll be working on the design and build of real-time trading and analytics platforms , leveraging microservices architecture and … ll collaborate closely with traders, data engineers, and DevOps specialists to deliver event-driven solutions that power trading decisions and optimise market operations. Experience required: Strong commercial experience with C# and .NET Core Proven experience building microservices-based architectures Strong knowledge of Azure Cloud Services (Functions, Service Bus, Event Hub, Kubernetes, etc.) Experience with event-driven/message-based systems More ❯

Senior C# Engineer | Renewable Energy Trading | £600-700 OUTside IR35 | 6 Months rolling | Hybrid (London) A Senior C# Engineer is required for a Renewable Energy Trading company that’s leading the charge in sustainable energy production, optimisation, and trading technology. With the UK committing over £24Bn to Renewable Energy , this is an opportunity to play a key part in the … the boundaries of technology to accelerate the shift to clean energy. 💰 £600–700 per day | OUTside IR35 📑 6-month rolling contract 📍 Hybrid – 2-3 days per week, London ⚡ Senior C# Engineer - Energy Trading experience required As a Senior C# Engineer , you’ll be working on the design and build of real-time trading and analytics platforms , leveraging microservices architecture and … ll collaborate closely with traders, data engineers, and DevOps specialists to deliver event-driven solutions that power trading decisions and optimise market operations. Experience required: Strong commercial experience with C# and .NET Core Proven experience building microservices-based architectures Strong knowledge of Azure Cloud Services (Functions, Service Bus, Event Hub, Kubernetes, etc.) Experience with event-driven/message-based systems More ❯

.NET Developer, C#, WPF - Asset Management - London (Tech stack: .NET Developer, .NET 9, C#, WPF, Azure SQL, MVVM, Prism, TDD, Agile, Scrum, Kanban, Programmer, Engineer, Architect, .NET Developer) Founded in 1930, our client is a leading investment manager with offices in Europe, Asia and North America. They manage over £120 billion across all asset classes and employ over 2000 people … around the world. Working in tandem with Microsoft they are developing revolutionary .NET/C# software applications that have attracted much attention in the trade press. We are seeking two .NET Developer to work on these exciting Greenfield enterprise level .NET/C# projects. .NET Developer applicants should have strong knowledge of: .NET, C#, WPF and Azure SQL. This is More ❯

.NET Developer, C#, WPF - Mobile Telecommunications - London (Tech stack: .NET Developer, .NET 9, C#, WPF, Azure SQL, MVVM, Prism, TDD, Agile, Programmer, Engineer, Architect, .NET Developer) Established in the early 1990s and listed on the London Stock Exchange our client is an instantly recognizable brand within the mobile telecommunications arena. They are widely recognized as innovators within the market and … their brand beyond mobile with the launch of several new products. As such they are looking to recruit 6 .NET Developer to help design and develop the .NET/C# software applications that will be the backbone of this exciting new generation of products and services. The ideal .NET Developer candidates will have a skill set that encompasses: .NET, C# … SQL, MVVM, Prism, continuous integration, dependency injection, TDD and Agile (Scrum/Kanban). This is a truly exciting opportunity to work on complex enterprise level, Greenfield .NET/C# projects and to develop revolutionary products that will be the envy of the industry. Location: London, UK/Remote Working Salary: £40,000 - £60,000 + Bonus + Pension + More ❯

V19-V23 preferred), as well as API design and development fundamentals and with API testing using tools such as Swagger Good SQL/Sybase skills; building modern applications with C# Strong hands-on development experience with: AVS, OpenJVS, Open Components, Java, SQL, C#, Python Connex Gateways for trade booking and market data integration Real-Time Position Engine (RTPE) and Automated More ❯