76 to 100 of 108 C# Jobs in the City of London

demand ambitious innovation and thought leadership. The Role The Application Support Engineer will provide operational and technical support for business-critical applications built on C# and .NET technologies. The role focuses on maintaining application stability, resolving production issues, supporting releases, and collaborating with development teams to ensure reliable, secure … performant systems in live environment Your responsibilities: · Provide day-to-day support for C#/.NET-based applications across production and non-production environments. · Investigate and resolve application incidents, including code-related and configuration issues. · Analyse application logs, exceptions, and stack traces to identify root causes. · Perform minor code fixes ...

Senior Software Engineer | Remote | £60,000 - £70,000 | C# | .Net | React | Azure | Microservices | .NetCore | .Net Developer | Full stack Developer | Opus have exclusively partnered with a brilliant Saas company that harness technology to build Software within the Proptech industry. They’re currently looking for a Senior Developer to come on board … will be mentoring other Developers and driving best practices. You will be getting to work across a modern Microsoft tech stack which includes C#, .Net, .NetCore, React, Azure, Microservices and TDD. This company work remotely with occasional visits into their office in the South East and offer some brilliant benefits ...

scalable operations. The Role: Lead the design, development, and support of integration solutions connecting applications, services, and data across the business. Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). Implement CI/CD pipelines, automation, and modern … standards. Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. What's required: Strong experience with .NET (C#) for APIs and integration components. Hands-on with Azure Integration Services, microservices, and containerisation (Docker, AKS). Experience in Financial Services is essential; knowledge ...

across multidisciplinary engineering teams, providing technical leadership while remaining hands‐on with complex systems. What You’ll Do Build production‐grade software using .NET C#, Python , and modern backend technologies Design and prototype services using containerised microservices Apply and challenge engineering best practices to continuously improve quality Make sound technical … culture of technical excellence What You Bring Degree in Computer Science, IT, or related field 5+ years’ experience building backend systems with .NET C# and ASP.NET Core Web APIs Strong understanding of Clean Architecture , CQRS , ideally with MediatR Experience with communication protocols: TCP/IP, UDP, REST, gRPC, SignalR Familiarity ...

C# Developer/Software Engineer (.Net AWS AI) London/WFH to £80k Are you a C# Developer with finance experience? You could be progressing your career at a boutique Asset Manager that specialise in Fixed Income markets and have multi-billion dollars under management. What ...

C# Developer Role - Hybrid/Liverpool street - 6 month Contract - Banking Role - C# Developer (T/SQL, PL/SQL) Duration - 6 months with very likely extension Location - Hybrid/Liverpool Street (London) - 3 days per week in a Liverpool Street office Rate - £690 per day (Inside IR35) Tech Stack … C# SQL Oracle Tasks Tasks include understanding business requirements, designing applications, business data analysis, programming in Visual C#.NET using both Oracle and SQL Server database, Unit testing, Quality Assurance (QA), Implementation, Production and Disaster Recovery environments supporting users and preparing documents. Along with the application development, this role will also ...

building and enhancing applications that directly support real-world trading strategies, working closely with experienced developers, researchers, and traders. This role sits within a C# .NET, SQL Server, and ASP.NET ecosystem, with a strong focus on building reliable, scalable, and maintainable systems. Key Responsibilities Design, develop, and maintain applications using … C# and .NET Contribute to system architecture and technical design discussions Build and enhance systems supporting trading and research activities Develop and optimise database solutions (SQL Server or similar) Improve system performance, reliability, and automation Collaborate with cross-functional teams to translate requirements into technical solutions Participate in code reviews ...

Senior SQL Engineer - C# | SQL Server, Concurrent SQL environment | 25-Year Systematic Hedge Fund £120-160k circa + Bonus (up to 100%) City of London - on-site Our client, an algorithmic trading hedge fund with a 25-year track record in systematic trading, are hiring a Senior SQL Server … team and closely with the Chief Investment Strategist, with real ownership over how this part of the system develops. The stack is SQL Server, C# and .NET 9 on Windows VMs in Azure, but this isn’t your typical SQL role. There’s no heavy ETL or pipeline work. Instead ...

experienced developers, researchers, and traders, you'll play a key role in delivering reliable and scalable solutions. Our client's technology stack primarily includes C#, .NET, SQL Server, and ASP.NET, and you'll receive mentorship to help you grow your expertise in these areas. Key Responsibilities Assist in designing, developing … maintaining applications using C# and .NET Support the development of scalable systems for trading and research Contribute to database development and optimisation (SQL Server or similar) Collaborate with senior developers, researchers, and traders to deliver software solutions Participate in code reviews and adopt best engineering practices Help improve system performance ...

queries, stored procedures, and data processing logic to handle high-volume structured data Design and implement backend services using modern programming languages (Python or C#) Support and enhance existing legacy platforms, identifying opportunities for iterative modernisation Improve query performance through indexing strategies, query optimisation, and data processing efficiency Enhance platform … Server skills, including complex queries, stored procedures, indexing, and performance tuning Experience working with large relational datasets Solid backend development experience in Python or C# Experience working in AWS environments Experience with complex enterprise or legacy systems Strong analytical and problem-solving abilities Ability to operate autonomously with minimal onboarding ...

Senior Software Engineer (.NET/C#) | Greenfield Systems Rebuild | Remote (UK) | £80,000-£100,000 This is a hands-on senior engineering role with real technical authority. You will be the lead engineer and technical decision-maker on a greenfield rebuild of a mission-critical system, working within a small … planning. WHAT WE'RE LOOKING FOR Must-have 5+ years in senior software engineering or technical lead roles, with strong hands-on .NET/C# delivery. Demonstrable experience leading architecture decisions on production-grade systems, not just contributing to them. REST API design and integration experience at scale, including defining ...

Development Team Lead/Tech Leads (x5 roles) – C#, .NET, Azure, Testing, Remote - Scotland - Award-Winning, High-Growth Tech Scale-Up Award-Winning, High-Growth Tech Scale-Up | AI-Powered SaaS | £67,000–£80,000 + Market-Leading Benefits Areti Group – Carbon Positive Tech Recruitment | People & Planet Before Profit 🌳 About ...

with pragmatic, commercial solutions. You’ll have direct interaction with PMs, quants, and the CTO, contributing across design, architecture, and production support. Tech Environment C# and .NET are central to the team’s core systems Python is widely used across quant and data groups Open to candidates from other … essential, but interest in Fixed Income/Rates is beneficial Requirements Strong academic background in Computer Science or related field Excellent programming ability in C# and .NET Experience with large or complex data sets 1–5 years’ experience in a software engineering role Interest in finance; exposure to fixed income ...

will develop and consolidate systems, write software, guide a team of developers, and take ownership of several critical platforms. This includes an in‐house C# PnL and Risk system that performs real‐time portfolio valuation, alongside other components that will be integrated into a cohesive, modernised core platform. You will … date) accounting reconciliations Particular interest in candidates with Fixed Income and Rates experience Technical Skills Strong computer science fundamentals Hands‐on development experience in: C# and .NET (essential for this role) Python within quant or data environments The client will also consider exceptional engineers from other OOP backgrounds such ...

.NET Developer, C#, WPF - Asset Management - London (Tech stack: .NET Developer, .NET 10.0, C# 14, WPF, Azure SQL, MVVM, Prism, TDD, Agile, 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 ...

.NET Developer, C#, WPF - Mobile Telecommunications - London (Tech stack: .NET Developer, .NET 10.0, C# 14, 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 … 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 ...

Lead C# Engineer - Agentic Workflows & Native AI Engineering, .Net 8/9, AWS (Lambda, SQS) OUTSIDE IR35 Reporting to the Director of Engineering, this is a genuinely outstanding contract opportunity for a rockstar Senior C# Engineer to lead the development of a greenfield SaaS product . Were looking … twinned with experience of AI-Native Engineering and Agentic Workflow . Skills Were Looking For: SeniorStaff-level backend engineer with deep, current expertise in C# and .NET Core 8/9 , capable of architecting and leading the design of distributed REST API microservices at scale. Authority in AWS serverless architecture ...

Senior C# Engineer City of London (On-site) Permanent | £90,000 – £120,000 We’re partnered with an innovative proprietary trading firm in the City of London that is hiring a Senior C# Software Engineer . You’ll work on greenfield projects, cutting-edge technology, and play a key part … culture where innovation and creativity are encouraged Great work-life balance supported by wellness perks, healthcare, and team socials Key Requirements Strong background in C# and the .NET platform (working with the latest versions) Database knowledge (SQL Server, Oracle, or equivalent) Degree in Computer Science or related subject Fluent ...

Software Engineers with knowledge around C# or Python, are wanted by a London based Scale-Up at the forefront of the energy revolution, driving innovation to power a sustainable Net Zero future. You will be joining a highly talented team who come from an engineering mindset. The team is working … analytical/mathematical product covers Energy Power Trading, Storage, and Power Modelling. Ideally, you’ll have experience of designing, refactoring, implementing and testing C# code, with a focus on maintainability, testability and performance. This company has a collaborative environment where they like their Developers to have a real influence ...

What You'll Do Develop and optimise SQL Server queries, stored procedures, and data processing logic Design and build backend services in Python or C# Modernise legacy platforms and improve system performance Build and maintain AWS-hosted services and APIs Collaborate with distributed engineering and product teams Top Skills Required … Advanced SQL Server expertise (performance tuning, indexing, complex queries) – non-negotiable Backend development in Python or C# AWS environment experience Proven experience in enterprise or legacy systems – critical Strong analytical and problem-solving abilities We'd expect you to have around 10 years of software and data engineering skills. Nice ...

Hands On Software Engineering Managers/Tech leads – C#/.NET/AZURE - Data & Performance 🌳 This is a hands-on technical leadership role with a strong focus on data architecture, application performance, and platform scalability. You’ll lead a small senior engineering team, combining technical delivery with people leadership (around … thoughtful technical challenge 🌳 Remain technically hands-on, solving complex backend and data-driven problems 💻 Tech Stack Strong backend experience is essential. Core technologies include: 🌳 C#/.NET (Framework & .NET Core) 🌳 Azure SQL Server 🌳 Azure Cloud Platform Bonus experience (nice to have): 🌳 Azure Cognitive Search 🌳 Data pipelines (Fabric or similar) 🌳 Search ...

Backend Software Engineer/Developer (Windows C/C++, C#) London to £75k FTC Are you a skilled Backend Software Engineer with strong C++ skills? You could be progressing your career in a senior, hands-on role at a global market data provider. As a Backend Software Engineer you will … time and low latency, maintaining data feeds and developing key underlying transport protocols for data transmission. The platform has been built with C++ and C# deploying to AWS and requires high scalability and low latency - they currently handle 40 billion messages per day. Location/WFH: You'll join colleagues ...

Software Engineering Manager – Liquidity Management - Greenfield Project FinTech | SaaS | Cloud-Native | Azure | C#/.NET Ripple is hiring a Software Engineering Manager to lead the modernisation of our Liquidity Management platform , powering $100B+ in daily cash flow across 40+ countries. This is a rare opportunity to rebuild a mission-critical … within a You-Build-It-You-Run-It culture We’re looking for: • Proven Engineering Manager experience - leading teams of 5+ • Strong background in C#/.NET/SQL Server • Experience with cloud-native architecture (Azure preferred) • Agile delivery & engineering excellence mindset • Ability to scale teams and influence technical direction ...

About the job C#/.NET Engineer (Commodities/Derivatives) | £75k - £95k | London (Hybrid) We’re looking for a strong C#/.NET Engineer to join a Back Office IT team within a financial markets environment. This role combines hands-on development with ownership of critical systems, supporting core operations … broader data platform transformation. What you’ll be doing: Supporting and enhancing existing back-office trading applications Designing and building backend solutions in C#/.NET Working closely with stakeholders across trading, risk, and operations Contributing to data platform initiatives (Azure Data Lake/Databricks) Maintaining and improving performance ...

Front Office C# Developer - Commodities Derivatives Day Rate: Up to £750/day (Umbrella) Duration: 6 months initially Location: Marylebone - London Working Arrangement: Hybrid - 3 days per week onsite We're looking for a Front Office C# Developer to join a London-based leading Global Markets business team supporting … Ensure platform stability through robust testing and release control. Follow team standards for code review, deployment and architectural governance. Essential Strong commercial experience with C# Solid SQL Server experience Background working on complex, business critical platforms Experience with commodities and/or derivatives products Organised, delivery-focused, and comfortable working ...