Top .NET Developer Jobs in London

Provides Level 3 support for business-critical Microsoft applications, resolving complex incidents, defects, and performance issues. Delivers minor enhancements, change requests, and project work; advises customer stakeholders; maintains Azure DevOps pipelines; and improves application stability and supportability. Acts as a senior technical escalation point, mentors junior consultants, performs root cause analysis, and contributes to continual service improvement in a managed services environment.

Provides strategic leadership for globally distributed engineering teams across the Identity and Fraud organization. Responsibilities include people leadership, delivery accountability, AI-native engineering adoption, technical strategy across .NET, Java, AWS, and EKS, technology modernization, stakeholder alignment, governance, workforce planning, budgeting, vendor management, and developing engineering leadership talent.

The role involves developing and maintaining back-end systems for e-commerce platforms using .Net technologies, ensuring data delivery and optimizing application logic. Responsible for integrating API services and enhancing application performance.

The role involves designing and developing high-performance C# solutions for FX trading systems, integrating the Orchestrade platform, and providing technical leadership within the team.

As a .NET Engineer at Trainline, you will develop features, ensure code quality, mentor team members, and manage the development lifecycle.

The Enterprise Sales Account Executive focuses on prospecting, qualifying, and closing new business, specifically within the Manufacturing industry, while developing strategies and maintaining customer relationships.

As a Senior Full Stack Engineer, you'll design and deliver complex features for the Avios App, collaborating with engineers and other roles to enhance mobile experiences and scale the platform.

Lead global Identity & Fraud engineering teams to drive delivery, modernisation, and AI-native practices. Own people leadership, talent strategy, budgeting, vendor management, and cross-functional partnerships. Embed DevOps, cloud (AWS/EKS), Java/.NET full-stack expertise, and AI tools to deliver scalable fraud and identity products for global B2B clients while ensuring governance, security, and operational excellence.

Designs and executes manual and automated tests for web, API, and backend applications. Develops reusable automation frameworks, regression suites, and test scripts using C#/.NET or Java. Tests REST APIs, integrations, databases, cloud applications, performance, and reliability. Collaborates with developers and product owners to investigate defects, participates in Agile ceremonies, integrates testing into CI/CD pipelines, documents results, and improves quality processes and practices.

Lead and deliver carbon accounting, net-zero and climate risk projects (Scope 1-3). Support strategy growth, client origination, project management, data analysis, reporting (SBTi, CDP, SECR), and process improvement while building client and industry relationships.

The Senior Backend Engineer will develop features, improve code quality, mentor others, and manage the development lifecycle while focusing on customer priorities and technical decisions.

Design, build and operate backend services in C#/.NET; own full development lifecycle, mentor teammates, improve reliability, observability, CI/CD, and scale microservices across AWS.

Part-time marketing role supporting industry, competitor, prospect, and market research; AI-generated content review; source verification; SEO and AI-search research; campaign and sales materials; and development of repeatable AI-assisted marketing processes. The role requires strong writing, analytical thinking, fact-checking, attention to detail, independent work, and curiosity about technology, AI, business, and marketing. It is a 12-week, remote UK-based paid program requiring 15–20 hours weekly.

Senior developer role focused on building and maintaining data-oriented systems for energy trading: full lifecycle delivery, mentoring, contributing to architecture, collaborating with users and support teams, and ensuring observability and incident resolution for high-volume/low-latency data applications.

Design and ship production-grade AI features into established C# .NET products: prompt and context design, LLM integration, error handling, fallbacks, monitoring, and structured evaluation. Collaborate with product owners and engineers, prototype quickly, harden features, and document work so teams can maintain and adopt AI capabilities safely and effectively.

Lead global go-to-market strategy for the IFS Sustainability portfolio: create repeatable GTM motions, develop sales plays, drive pipeline growth, support strategic deals, align Sales/Marketing/Product/Customer Success/Partners, and measure commercial performance to increase adoption and win rates.

Build, optimize, and support a scalable AWS cloud risk platform that computes risk for cash and derivative trades using Snowflake-stored data. Develop Python-based risk engines, improve distributed computation performance, reconcile outputs with legacy systems, troubleshoot pricing/risk issues, collaborate with IT teams, and participate in on-call support.

The Backend Developer will engage in application development focusing on coding, debugging, and collaborating with cross-functional teams to provide technical solutions and improve backend infrastructure.

Develop and test front-end components using Microsoft .NET stack (C#) and Visual Studio. Work with MS SQL Server, MFS library, Azure services and rule-engine pub/sub patterns. Handle configuration management, collaborate with stakeholders, and maintain certification in relevant technologies.

The Senior .Net Developer will enhance SDG's C#/.NET Core codebase, design high-load services, and optimize MS SQL queries, benefiting from a remote work environment and attractive benefits.

Provide Net Working Capital reporting and analysis across GroupM EMEA. Prepare monthly and quarterly reporting packs, analyse aged balances and provisions, support market reviews, maintain dashboards and trackers, monitor commentary completeness, and drive follow-up actions and process improvements with finance and commercial teams.

Design, build and maintain backend .NET services for high-volume transactional rail booking systems. Deliver features, ensure quality and observability, own deployments and monitoring, mentor teammates, and drive technical decisions within an Agile team.

Lead full-stack development on a greenfield product: design architecture with central architects, build .NET Core back-end services and React front-end components, use AI tooling (GitHub Copilot), manage Azure DevOps CI/CD, design MongoDB schemas, integrate Microsoft Dynamics CRM, and enforce code quality via reviews and secure AI-assisted practices.

Sell IFS Copperleaf to UK&I enterprise customers: identify and qualify net-new opportunities, build C-level relationships, drive license/support/services revenue, manage CRM pipeline, collaborate with technical and marketing teams, and attend industry events (50% travel).

Mid-level .NET backend engineer responsible for delivering new features, owning the development lifecycle from code to production, ensuring quality, improving the codebase, mentoring teammates, working on high-volume transactional systems with asynchronous processing, and supporting deployment, CI/CD and monitoring.