21 of 21 C# Developer Jobs in the City of London

Senior C# Developer/Software Engineer (C# .Net) London onsite to £150k Opportunity to progress your career in a senior, hands-on C# Developer role at a global Asset Manager with c$3 million under management. As a Senior C# Developer within the trading engine team you'll collaborate to … ll often be collaborating with he strategy team on Greenfield projects which you'll take ownership of and will see the business impact of. There's a focus on C# .Net backend and API development although you'll also have elements of front end work with JavaScript and React.js. Location: You'll be based in plush City office on … a fulltime basis, Monday to Friday. About you: You have expertise with C# .Net, ASP.Net development You have a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms You are collaborative with excellent communication and stakeholder management More ❯

Senior C# Developer – Endur Transition | Commodities Trading House | £120k + Bonus + Benefits | 2-3 Days Hybrid/Week in London A hands-on Senior C# Developer is required for a global trading company operating across energy, chemicals, metals, machinery, infrastructure, food, and financial services. With a strong footprint in energy trading , this client … oil, natural gas, LNG, and renewables . They are looking to bring someone on who is keen on learning and picking up on Endur for their ETRM systems. This C# Developer role will focus on building, enhancing, and optimising the company’s Energy Trading and Risk Management (ETRM) platform. You’ll be designing and implementing new solutions … a developer who can deliver immediate impact — coding, configuring, and optimising Endur to ensure scalability and performance when upgrading them from version 18 to 25. As a C# Developer focusing on Endur, you’ll work closely with business users, analysts, and other technologists to deliver solutions across front, middle, and back office , particularly around pricing More ❯

Looking to excel your career in a start-up environment? C# Developer – VC-backed Cloud Security 💰 Salary up to £120k + equity 📍 London 5 days in office 🌎 Visa sponsorship available We have recently partnered with a rapidly growing VC-backed startup who develop technology to identify and minimize the effect of security incidents, with the aim of … to minutes. Their solution is built for rapid deployment and ease of use, enabling organisations to handle threats far more effectively. They are now on the hunt for a C# Developer to work on the system that platform processes billions of events every week, powered by modern cloud infrastructure and innovative methods. 👀 Experience required as a C# Developer: Russell Group university 1st Class Degree in Computer Science (or related – Maths, Physics, Engineering) 2-6 years experience in C# (also open to Python & Go engineers) Strong computer science fundamentals End-to-end project experience (from design, to build, to deployment) 💡 What you’ll do: Write clean, scalable code in C# Drive innovation using More ❯

Senior C# Developer - Commodities Trading - Outside IR35 Exciting opportunity for an experienced senior developer to build on their experience in Commodities or similar trading development role in this successful Commodities Trading company. £750 - 800 per day Outside IR35 The Senior C# Developer will have significant prior experience as a Senior Software Engineer …/Senior Developer working as C# Developer in a Commodities trading environment where they will have gained knowledge of the full trade life-cycle and feel comfortable speaking directly to traders and senior stakeholders in the business as well as senior technical colleagues such as architects. Central London location, with Hybrid working expected. Very strong … core skills in C# are expected Good knowledge of Commodities Trading is also required. Please apply now if your curious to learn more, for a confidential discussion about the role and company Carbon60, Lorien & SRG - The Impellam Group STEM Portfolio are acting as an Employment Business in relation to this vacancy. More ❯

C# DEVELOPER Commodities Trading firm is looking to grow their business and are hiring a Senior .NET Developer due to significant growth across their Front Office team. This is an extremely rare opportunity to break into the world of high-finance, trading and few and far between. £140-175k package This is an experienced … role within the team and the C# Developer will be expected to understand complex technical solutions and deliver in an Agile/SCRUM/Kanban environment. Requirements: C# - ESSENTIAL FRONT-END - VUE or similar - preferred AZURE - preferred TRADING - preferred The role is hybrid working, 2 days in lovely central London offices. Free cooked or contintal breakfast More ❯

C# Developer (Contract) – Investment Bank - Mid-Level/AVP Location: London (4 days in office) Contract: 6 Months Rate: £600–£800 per day Team: EMEA Markets Engineering We are supporting a leading global investment bank in their search for a mid-level C# Developer (Contract) to join the EMEA Markets Engineering team. This is … on the development side than operations, while understanding how these systems are managed in production the role includes: Maintaining and enhancing front-office pricing and risk systems built in C# Collaborating with quantitative analysts and traders to understand requirements and deliver effective solutions Troubleshooting and resolving production issues, ensuring smooth system operation Working with grid and cloud-based platforms … rather than leading large greenfield projects. Essential Experience: 4–7+ years of experience in quantitative development or technical roles supporting trading/risk systems Hands-on development experience with C# Understanding of derivatives, pricing, and risk concepts Exposure to front-office/trading environments in a financial institution Experience maintaining or supporting production systems (DevOps-lite, more dev than More ❯

Senior Backend Developer (C#/.Net) | Brand New Trading Payments Desk | £130,000 + Bonus + Benefits | London Hybrid I am looking for a Senior Backend Engineer with a .Net (C#) focus for a Trading House that build cross asset trading systems. The FinTech are building from the ground up and currently expanding their team to … role is paying up to £130,000 + bonus + benefits 📍Located in London City, St Paul's, with 3 days per week from the office 🧑.Net, C#, .Net Core Responsibilities of the Senior Backend Developer: Designing, coding, and testing all components of modern web applications. Contribute to the overall architecture and design of the … technology created/maintained by the delivery team. Develop Web Trading Applications using .Net, C# Develop solutions to a high standard that is maintainable, testable and meets the requirement’s acceptance criteria. Adhere to development best practices and processes. Communicate with team members, introduce ideas, and keep abreast of the latest technologies If you are interested in this Senior More ❯

C# Developer (.Net) Location: Canary Wharf Hybrid: 3 days onsite per week Rate: £415 per day (Inside IR35) Duration: 6 months initial contract with potential extension up to 2 years with a Permanent conversion option Positions Available: 13 positions Industry: Financial services Interview Process: 2 rounds of interview - Face-to-face interview only, and Technical assessment - Home … behalf of our client, a leading financial services company, within their Business Intelligence development team. The role focuses on developing and supporting business applications using the MS .NET platform (C#, Visual Studio) and working with both Oracle and SQL Server databases. You’ll be joining a collaborative team that delivers key business solutions across various environments. Key Responsibilities: Design … develop, and maintain business applications using Visual C# .NET with Oracle and SQL Server databases Provide ongoing support for existing C# and .NET applications, including troubleshooting and implementing solutions Write and optimise T-SQL and PL/SQL scripts for data analysis and reporting requirements Collaborate with Database Administrators, Technical Support, and Infrastructure teams across London and New More ❯

A global trading organisation is seeking a skilled C# Developer to join a high-impact team dealing with business critical projects. This an exciting opportunity to contribute to strategic solutions while being part of a broader modernisation programme into a cloud and data platform focused environment. As the business moves away from legacy systems and invests in … intersection of stability and transformation — ensuring continuity in existing applications while helping shape the future tech landscape. What You’ll Be Doing: Develop and maintain full-stack solutions using C#, SQL, and front-end technologies like React. Support mission-critical regulatory applications as part of a collaborative, Agile feature team. Contribute to the strategic migration from legacy platforms to … to deliver high-quality, scalable software in a Kanban Agile environment. What We’re Looking For: 3–6 years’ experience as a software engineer or similar. Strong skills in C#, SQL, REST APIs, and single-page web applications. Hands-on experience with Azure, Git, CI/CD, and DevOps tooling. Exposure to or interest in Python and Databricks as More ❯

AI Software Engineer/Developer (C# .Net) -/switzerland Location/Work From Home This role supports a flexible work environment that includes both in-office and remote options. About You: - You are an accomplished Software Engineer, well-versed in the latest best practices in software development, eager to share your knowledge and enhance team processes. - Your … strong backend development skills in C# enable you to create solutions that are both efficient and effective in addressing user needs. - You have a genuine interest in Artificial Intelligence, specifically in areas like prompt engineering and are enthusiastic about expanding your expertise in these fields. - Your robust analytical and problem-solving skills empower you to navigate challenges constructively, while More ❯

Role Type : Perm Title – Senior C# Engineer Client – Established Financial Institution Salary - Up to £140,000 P/A + Bonus Location – London/Hybrid My client is a well-established and successful tech house working in the finance sector who are looking a talented senior C# Developer, with outstanding technical and communication skills to join … with some of the best technologists out there, one some of the most up to date tech in the industry, on a greenfields project! Requirements: Strong experience working with C#/.Net Experience working with Cloud Technologies (Azure preferred) Experience working with Typescript - Angular or React Strong SQL experience Finance experience a plus! Strong Communication skills with a drive More ❯

Role Type : Perm Title – Junior C# Engineer Client – Established Financial Institution Salary - Up to £80,000 P/A + Bonus Location – London/Hybrid My client is a well-established and successful tech house working in the finance sector who are looking a talented Junior C# Developer, with outstanding technical and communication skills to join … with some of the best technologists out there, one some of the most up to date tech in the industry, on a greenfields project! Requirements: Strong experience working with C#/.Net Experience working with Cloud Technologies (Azure preferred) Experience working with Typescript - Angular or React Strong SQL experience Finance experience a plus! Strong Communication skills with a drive 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 … 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 ❯

C# .NET Software Developer with FX and Fixed Income Our Client is a niche boutique broker specialising in FX. They are looking to recruit a C# .NET Software Developer with at least 3 to 5 years proven track record of developing with C# .NET. The Client would like meet candidates ideally with some … to external reporting/tradeflow and pricing APIs. Maintaining the companys daily operation on the existing platforms. Essential skills :- Minimum 3 to 5 years experience of Microsoft web technologies(C#, ASP.NET Core MVC ) Relational database experience (SQL Server) Proactively able to build relationships with stakeholders:- sales, brokers, middle office, external vendors. Ability to produce clean, well-written, fully tested More ❯

C# .NET Software Developer with FX and Fixed Income Our Client is a niche boutique broker specialising in FX. They are looking to recruit a C# .NET Software Developer with at least 3 to 5 years proven track record of developing with C# .NET. The Client would like meet candidates ideally with some More ❯

As a C# skilled Quant Developer , you'll work closely with portfolio managers, researchers, and data scientists to build and maintain the systems that drive our alpha-generating strategies. You’ll contribute to every part of the investment pipeline—from research tooling and data infrastructure to real-time trading systems. Key Responsibilities: Design, develop, and optimize high … performance trading tools and data pipelines using C# and ideally Python Build research platforms that empower quantitative analysts and strategists Integrate and manage large, complex datasets from a variety of sources Collaborate with quants and PMs to implement and backtest trading models Ensure robustness and scalability in both real-time and batch environments What We’re Looking For: Strong … programming experience with C# Solid understanding of software engineering principles, design patterns, and performance tuning Experience in financial markets (equities, futures, FX, etc.) is a plus, but not required Familiarity with data science tools, APIs, and time-series databases is beneficial Self-starter attitude with a sharp eye for detail and a high level of ownership Why Join? Competitive More ❯

Paragon are working with a world class systematic hedge fund - after mutiple record breaking years they are scaling aggressively. We are searching for an elite C# Quant Developer to join a team working on building a platform which will enable the capturing of equity trade ideas. Focus: Develop tools and systems (often in C#/.NET … that help quants and researchers identify, test, and track trading opportunities. Translate research prototypes (e.g., from Python, MATLAB, or R) into production-quality C# code for real-time or batch execution. Design efficient data pipelines to ingest, clean, and store large volumes of financial and alternative data for use in signal generation. Improve computational efficiency and latency of backtesting … screening, or signal engines to handle high data throughput. Work closely with quant researchers to turn raw trading ideas into actionable, production-ready strategies. Tech: C#, Python, AWS If you are a an elite C# engineer - please get in touch More ❯

Title: C#/.NET Developer Client: Elite Buy-Side Fund Salary: Up to £70,000 + Bonus + Benefits Location: London (Hybrid) The Opportunity: Seeking a Junior C#/.NET Developer to join their high-performing engineering team. This is an exceptional opportunity to work alongside experienced technologists and investment professionals building mission-critical … technologies, machine learning and cutting edge tools to advance competitive edge. Who You Are: Recent graduate with stellar academics and 1-5 years of relevant experience Strong proficiency in C# and .NET Experience with multithreading, asynchronous programming, and SQL Server Proven ability to tackle complex challenges with initiative and agility in high-pressure environments Apply now or reach out More ❯

Data Developer – Hybrid - £800/day Inside IR35 | C# | ClickHouse | SingleStore | Rockset | TimescaleDB | 6-Month Rolling | I’m working with a commodities trading firm that’s embarking on a greenfield rebuild of their data-intensive trading platform, moving from traditional SQL infrastructure to a next-generation analytical stack built in .NET and ClickHouse. They’re looking for … a Data Developer/Engineer with a strong C# background and solid experience working with analytical databases and modern data lake technologies. The Details £800/day Inside IR35 6-month rolling contract Hybrid, 2 days onsite in London Key Focus Areas Strong experience with .NET/C# (backend-focused) Hands-on with analytical databases such … Iceberg, Delta Tables, Apache Spark, column stores) Comfortable working with large-scale data ingestion and processing (batch or streaming) Data Developer – Hybrid - £800/day Inside IR35 | C# | ClickHouse | SingleStore | Rockset | TimescaleDB | 6-Month Rolling More ❯

UI/UX Designer & Frontend Developer Mobile, WCAG, Adobe CC, HTML, CSS, Javascript, Blazor Outstanding opportunity to join this global enterprise and famous brand within the magic circle of the legal sector. From a technology perspective, this organisation is a leader in its domain, significantly investing in AI and automation within an established cloud native (Azure), DevOps and … design and wireframing tools like Figma, Blasamiq or Adobe Creative Cloud Strong front-end development skills in HTML, CSS, TypeScript, and JavaScript Hands-on experience with Blazor and .NET (C#) Extensive experience with Mobile & SaaS product development and cloud deployment (Azure) Strong grasp of responsive design, accessibility standards, and cross-browser compatibility (WCAG) Ideally, some end to end automated More ❯

UI/UX Designer & Frontend Developer Mobile, WCAG, Adobe CC, HTML, CSS, Javascript, Blazor Outstanding opportunity to join this global enterprise and famous brand within the magic circle of the legal sector. From a technology perspective, this organisation is a leader in its domain, significantly investing in AI and automation within an established cloud native (Azure), DevOps and More ❯