Top .NET Developer Jobs in London

Develop and maintain customer applications using C#, .NET, and ASP.NET; modernize legacy systems; create custom code and documentation; support client users; and contribute to integrations, data transformations, messaging systems, microservices, orchestration, continuous integration, and unit testing. The role also involves technical consultancy, project collaboration, client escalations, and influencing solution direction.

Develop and maintain Disney’s international e-commerce platform and marketing microsites. Responsibilities include backend development with C# and ASP.NET MVC 5, migrating legacy Classic ASP features, creating scalable and fault-tolerant code, integrating SOAP and REST services, managing development environments and deployment workflows, troubleshooting performance and errors, and contributing to modernisation initiatives using Agile, TDD, source control, and automated build practices.

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.

Lead carbon accounting, net-zero strategy, decarbonisation, and sustainability consulting projects for clients. Responsibilities include Scope 1–3 footprinting, SBTi and CDP pathways, transition plans, FLAG emissions calculations, verification, project management, client relationship development, new business generation, report writing, data analysis, and process improvement. The role also contributes to team growth, industry events, and commercially practical solutions that deliver measurable climate impact.

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.

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.

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.

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).

Design, build and maintain backend-focused full‑stack solutions for post-trade functions (risk, finance, treasury). Work across requirements, implementation, CI/CD, deployments, database design, BI/reporting, Azure cloud, containerisation, and stakeholder engagement to deliver robust, supportable systems.

Sell and close net-new enterprise customers in the Energy, Utilities and Resources sector. Prospect, qualify, and develop large transformational deals; build C-level relationships; create territory and account plans; manage pipeline and CRM; leverage IFS industry and technology solutions; coordinate internal resources and partners; deliver business cases and ROI; support promotions and events.

Design, build, and maintain full-stack web applications using React and .NET Core. Collaborate with data science, product, and design to deliver scalable cloud solutions, APIs, and UI prototypes. Contribute across discovery, delivery, QA, DevOps, and CI, applying SOLID principles and automated testing.

Senior full-stack developer responsible for designing, building and supporting trade capture/ETRM applications. Work includes Angular (or React) front ends and C#/.NET Core back ends, database and cloud deployments, CI/CD, collaborating with business analysts and traders, improving development processes, and ensuring robust, supportable long-lived solutions.

Develop, enhance and support bespoke, multi-asset trading applications using a Microsoft stack. Work with business stakeholders and senior developers to design, test, deploy and maintain robust front-end (Angular/React) and C#/.NET Core back-end systems, participate in CI/CD, code reviews, and contribute to architecture and process improvements.