Top .NET Developer Jobs in London

Build and maintain full-stack payment features using C#/.NET services and React front ends. Own payment services, lead projects through rollout, modernize legacy code, implement automated testing and observability, collaborate across teams, participate in on-call support, mentor engineers, and contribute to hiring. The role requires strong backend development experience, familiarity with React, TypeScript, and SQL, and hands-on use of AI coding assistants.

Lead the architecture and hands-on development of greenfield enterprise web platforms using modern .NET, C#, and Optimizely CMS/DXP. Establish engineering standards, guide implementation, conduct code reviews, mentor delivery teams, resolve technical blockers, and partner with product, UX, and commercial stakeholders. Ensure solutions meet performance, accessibility, security, and scalability requirements while supporting Agile sprint delivery and backlog management.

Develop and maintain C#/.NET applications, APIs, Azure Functions, and CMS components for a national live digital service. Investigate incidents, troubleshoot distributed systems, deliver fixes, manage releases, improve automated testing, modernize dependencies, and support secure, observable production services. Collaborate with architects, QA, DevOps, service management, and suppliers while coaching colleagues and improving operational processes.

Manage end-to-end grant administration for the Decarbonising Churches Grant Fund, serving as the main contact for applicants and grantees. Responsibilities include application assessment, offer and rejection processing, grant monitoring, payment claims, due diligence, record maintenance, reporting, budget forecasting, quality assurance, stakeholder engagement, case studies, and administrative support for the Net Zero Carbon Programme.

Designs and develops backend services for Trainline’s insurance products using C# and .NET. The role includes making technical decisions, mentoring engineers, owning software from development through deployment and monitoring, improving code quality, and removing delivery blockers. Responsibilities involve building scalable microservices and event-driven systems, working with AWS and infrastructure tooling, maintaining observability and reliability, and collaborating across engineering and product disciplines.

Leads and develops a European net-new enterprise sales team focused on prospecting, complex solution selling, C-level engagement, pipeline generation, and closing large software and cloud subscription deals. Owns territory strategy, revenue targets, account planning, customer relationships, partner coordination, sales forecasting, and CRM accuracy. Recruits, coaches, and retains high-performing sales talent while positioning IFS solutions across core industries and managing lengthy transformation sales cycles.

Build and own backend services and APIs using C# and .NET, integrate third-party systems, make technical decisions, and promote scalable, maintainable code. Mentor junior engineers through reviews and pairing, champion clean code and testing, and contribute to Agile planning and technical direction. Cloud experience and infrastructure-as-code knowledge support delivery across client projects.

Develop and deliver full lifecycle software solutions across front-end, back-end, and integrations. Responsibilities include coding, solution design, workflow planning, process optimization, quality assurance, customer requirement implementation, and team collaboration. The role may involve mentoring and team leadership, requires experience with .NET or similar technologies, and includes travel to UK client sites when needed under a hybrid working model.

Develop and support enterprise applications using C#, .NET, ASP.NET Core, SQL, and APIs. Troubleshoot production data issues, optimize queries and stored procedures, build Power BI dashboards, support SaaS integrations, and perform root-cause analysis. Contribute to Agile delivery, enterprise system design, Azure services, and AI-enabled solutions.

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.

Leads Anthesis’ global net zero and decarbonisation business, setting strategy, market positioning, growth priorities, and go-to-market direction. Drives flagship client engagement, business development, revenue growth, service innovation, and thought leadership. Coordinates global and regional teams, supports strategic hiring and talent development, and promotes consistent, high-quality delivery. The role requires strong commercial and sustainability expertise, international experience, and the ability to influence stakeholders across regions without direct authority.

Leads complex client software engagements through hands-on development, architecture, solution design, delivery management, and technical decision-making. Manages and mentors engineers, establishes engineering standards, troubleshoots complex issues, and oversees scope, estimation, planning, risks, dependencies, and outcomes. Builds trusted client relationships, translates business needs into technical plans, manages expectations, and identifies follow-on opportunities. The role also contributes to recruitment, pre-sales, consultancy practices, and technology thought leadership.

Apprentices will learn high-net-worth motor and home insurance while supporting client communications, policy amendments, renewals, insurer coordination, record maintenance, and tailored insurance solutions. The role includes an 18-month development programme, professional qualification, and progressive responsibility within Howden’s Private Clients team.

An 18-month apprenticeship developing knowledge of high-net-worth motor and home insurance. The apprentice will support client relationships, handle enquiries, communicate with insurers and underwriters, assist with policy amendments and renewals, and maintain accurate records. No insurance experience is required. The role is permanent from day one, based in the Amersham office four to five days per week, and includes a funded Level 3 Insurance apprenticeship qualification.

Lead architecture and technical strategy for Ripple Treasury’s liquidity platform. Build scalable cloud-native systems, real-time cash and liquidity data pipelines, digital asset capabilities, and AI-powered cash-flow prediction features. Mentor engineers, establish engineering standards, improve reliability and observability, manage technical debt, lead design reviews, and own critical systems from development through production support. The role requires deep C#/.NET expertise, database knowledge, large-scale enterprise application experience, and proficiency with modern cloud, frontend, and API technologies.

Provides senior technical leadership and delivery for complex .NET and cloud-native projects. Translates business requirements into technical designs, develops distributed and microservice solutions on Azure or AWS, writes integration and end-to-end tests, and maintains code quality and security standards. Collaborates with technical and non-technical stakeholders, contributes to architecture and design reviews, resolves technical challenges, and supports knowledge sharing and team development.

Prospect, qualify, sell, and close complex enterprise software opportunities with new customers across assigned industries. Develop territory and account plans, build C-level relationships, manage pipelines and lengthy sales cycles, position IFS solutions, orchestrate internal resources, and achieve revenue quotas. The role requires consultative selling, enterprise software expertise, value-based sales execution, and success with large transformation projects.

Develop and enhance scalable enterprise SaaS solutions across the full .NET stack. Responsibilities include coding, solution design, third-party integrations, database optimization, API development, CI/CD contributions, troubleshooting, testing collaboration, peer reviews, and maintaining secure, high-quality software for automotive retailers and OEMs.

Design, build, test, and maintain backend services, distributed systems, APIs, and frontend integrations for a last-mile delivery platform. The role requires strong ownership, architectural judgment, correctness, maintainability, and clear technical communication. Responsibilities include working with C#/.NET, event-driven systems, caching, Azure storage, RESTful APIs, webhooks, real-time integrations, and SPA frameworks while using AI-assisted development responsibly.

Leads end-to-end modernization from a monolith to microservices, including legacy analysis, architecture, estimation, data migration, deployment, and production support. Guides .NET services, databases, messaging, containerization, and frontend integrations. Acts as the technical escalation point for complex issues while improving Jira tracking, estimation accuracy, QA collaboration, release predictability, and engineering processes. Manages and develops the team through one-on-ones, performance reviews, feedback, and career-focused objectives.

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.

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.

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.

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.

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.