201 to 225 of 264 C# Jobs in London

Description Full Stack Engineer (C#/.NET & React) - Investment Banking London (Hybrid) | 6-Month Contract | Investment Bank We are working with a leading global investment bank to hire a hands-on Full Stack Engineer to help build a brand-new, high-impact web application from the ground up. This … lifecycle-not just individual development tasks. Key ResponsibilitiesBack-End Development Design and build RESTful APIs using ASP.NET Core (6+) Develop clean, scalable, and testable C# code Manage data access using EF Core, Dapper, or similar Implement secure authentication (e.g. Azure AD, JWT) Front-End Development Build modern, responsive UIs using ...

team, you will contribute both technically and strategically, helping shape development standards, performance optimisation, and system scalability. You will primarily work within a C# .NET SQL Server ASP.NET ecosystem, developing high-performance, reliable, and maintainable applications. Key Responsibilities Design, develop, and maintain high-performance applications in C# and .NET Lead … improvement of development processes and tooling Required Skills & Experience BSc (or higher) in Computer Science or a related scientific discipline Strong recent experience with C# and the latest .NET platform 5+ years of professional software development experience Solid experience with SQL Server, Oracle, or equivalent relational databases Strong understanding ...

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 ...

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 ...

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 ...

Dynamics 365 Developer - Remote (Tech stack: Microsoft Dynamics 365, PowerApps, Power Platform, C#, .NET, SQL, JavaScript, DevOps, Agile) Our client is a specialist technology business delivering bespoke solutions within the legal tech space. They are looking to recruit a Dynamics 365 Developer to work across both existing systems … wider Power Platform, alongside core .NET technologies. Key Responsibilities: * Develop and customise solutions using Dynamics 365 and PowerApps. * Build and maintain applications using C#, .NET, SQL, and JavaScript. * Enhance system performance, resolve issues, and deliver new features. * Work with stakeholders to gather requirements and translate them into technical solutions. * Contribute ...

inside ir35) Contract until Jan 2027 with 1 year extension expected. Responsibilities Develop quality software and web applications in Python and C# Process file automation - Extracting, Loading and Transforming workloads Analyse and maintain existing software applications Design highly scalable, testable code Discover and fix programming bugs Key technical requirements … Server expertise (current heavy usage) C# or Python programming capabilities Full-stack development experience AWS familiarity (Azure or GCP are substitutable) AI proficiency encouraged for efficiency gains Click the link to apply or email Barry.Ansell@HarringtonStarr.com ...

experienced Technical Lead – Integration to join their technology function. This is an excellent opportunity for a senior engineer or technical lead with strong C#/.NET and Azure integration experience to help shape scalable, cloud-native integration platforms within a collaborative, agile environment. The Role You’ll provide hands … best practices, maintainability, and code quality Contribute to roadmap planning, estimation, and technical strategy What We’re Looking For Strong hands-on experience with C# and .NET (Core/6+) Proven expertise across Microsoft Azure integration services including: Azure Functions Logic Apps Service Bus/Event Grid API Management Azure ...

strategies are resilient, auditable, and suitable for a financial services control environment Create and oversee build and delivery pipelines supporting applications written in Java, C# .NET, JavaScript (React JS), Python Ensure pipelines are production-grade, observable, and aligned to operational and audit expectations Cloud & Containerised Application Enablement Provide expertise … Extensive experience designing and delivering enterprise-scale CI/CD solutions, with GitLab experience essential Strong hands-on experience supporting build pipelines for Java, C#, JavaScript, and Python Proven experience building reusable CI/CD frameworks supporting multiple teams and products Cloud & Containerisation Strong experience with cloud platforms and modern ...

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 ...

Terraform Infrastructure Engineer/IaC SME - Banking Client - London, Paris, Brussels or Amsterdam Rate: Flexible Rate Hybrid Working: 8 days onsite per month - the rest is remote Duration: 1 year freelance We are seeking a ...

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 ...

APPLICATION DEVELOPER – C#/F#/ASP.Net MVC/SQL/JavaScript C#/F#/ASP.Net MVC/SQL/JavaScript The company Long standing and respected Software House with a varied client base. The role Web Application Developer is required to design, develop, test and support (primarily … will analyse requirements, specify systems, features and processes as well as develop new features for existing systems or develop entirely new systems (usually in C# but possibly F#). Additionally you will write unit/integration/scenario tests for code (typically test-driven development) and reports and queries against ...

Senior C#/.NET Developer - Financial Technology (Risk & Financing Platforms) Pay Rate: £600-£650 (Inside IR35 via umbrella) Location: London - 3/4 days per week (with flexibility) Duration: 6 Months (due to be extended) A leading global financial institution is expanding its engineering group and is looking for experienced … C#/click apply for full job details ...

Software Engineer Tech Stack: C#, .NET, Python, AI Development, SQL, Azure London - Onsite Salary Range: £70,000 - £90,000 Harrington Starr has partnered with a boutique Investment Bank, with decades of experience and exceptional performance. They are currently seeking to hire a Polyglot Engineer possessing strong experience developing front office … applications and systems, written in C# and Python. If you have a deep interest working with modern technologies, building reliable business applications this could be the role for you. Responsibilities: Design and develop new front office application utilising C#, .NET, Python Working on internal systems to maintain quality and standards ...

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 ...

Full Time Job Description: Python is the key skill needed + SQL + AWS experience + Terraform. e.g. Building investment analysis platforms using Python. C#/.NET is still desirable but not as critical (e.g. more for changes to microservices than new build in C#, Windows migration work). Investment ...

seeking an experienced .NET Developer to join our Business Intelligence IT team. You will develop and support SMBC BI business applications using C# and MS .NET Framework , working across SQL Server and Oracle databases. This role involves both new development and maintenance of existing applications , ensuring stability and compliance with … change management procedures. Key Responsibilities Develop and maintain C#/.NET applications for BI systems. Analyse business requirements and design technical solutions. Write and optimise T-SQL and PL/SQL scripts for data analysis. Collaborate with DBAs and infrastructure teams in London and New York. Support production environments, troubleshoot ...

Senior C#/.NET Developer | Financial Services (Risk & Securities Lending) Location: London (Hybrid) Role Type: 6 Months Contract, Rate: 585/day inside IR35 Are you an expert in C#/.NET with a deep understanding of the mechanics behind Risk Management or Securities Lending We are looking … needs into technical reality. Architecture: Participate in high-level technical design and architectural discussions to evolve the platform. Requirements Technical Core: Extensive experience in C#, .NET, SQL Server, and CI/CD pipelines. Domain Expertise: Proven track record in Financial Services , specifically within Risk, Securities Lending, Prime Brokerage, or Collateral ...

threads per second. This presents an exceptional opportunity to participate in the development of pioneering technologies within the sports betting domain. Responsibilities as the C# Software Engineer: Build and scale real-time, distributed systems Contribute to architecture, design & delivery of core products Ship high-quality code using CI/… great fit for this opportunity if you have: A Computer Science or Mathematics (or equivalent) degree from a Top Russell Group university. Some commercial C# project experience and strong understanding of software design principles Passionate about working in complex real-time environments building highly-scalable systems. Effective communication and collaboration ...