La Fosse
Senior Full Stack Developer
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Senior Full Stack Developer (React /.NET)
Overview
Type: Contract
Day Rate: £800 per day inside IR35
Hybrid Working: 3 days onsite in Waterloo, London
We are seeking a Senior Full Stack Developer to play a key role in the modernisation and migration of a business-critical application platform. This position combines hands-on development with technical leadership, requiring an individual who can define architecture, guide engineering decisions, and lead the migration of an existing Databricks-based application into a modern React-driven solution.
While the role is full stack in nature, there is a strong emphasis on React front-end development and architecture. The successful candidate will be responsible for designing and building a new front-end platform, while working alongside existing .NET backend services and integrations.
This is an opportunity to join a core Data & AI engineering team supporting Trading & Supply initiatives, working closely with engineering, product, and business stakeholders to deliver scalable and high-performing applications.
Key Responsibilities
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Application Modernisation & Migration
- Lead the migration of an existing application currently built on Databricks into a modern React-based application.
- Define and own the migration strategy, technical roadmap, and implementation approach.
- Assess existing architecture and recommend scalable solutions for future-state application design.
- Work closely with stakeholders to ensure seamless transition and minimal disruption to business operations.
Front-End Development (Primary Focus)
- Design, develop, and maintain modern React applications.
- Build responsive, reusable, and performant user interfaces.
- Establish front-end architecture, best practices, coding standards, and component libraries.
- Drive the overall React integration strategy across the application landscape.
- Provide technical leadership around front-end development and user experience.
Back-End Development
- Develop and maintain backend services using .NET and C#.
- Build and support APIs, integrations, and microservices.
- Contribute to application performance, scalability, and reliability.
- Collaborate with data and platform teams to ensure effective integration between application and data layers.
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Required Experience
Essential
- Significant commercial experience as a Full Stack Developer or Senior Software Engineer.
- Expert-level React development experience.
- Strong experience designing and building front-end applications from scratch.
- Strong.NET and C# backend development experience.
- Experience leading application modernisation, migration, or transformation initiatives.
- Experience defining software architecture and influencing technical direction.
- Experience building RESTful APIs and scalable enterprise applications.
- Strong stakeholder communication and technical leadership skills.
- Experience working within Agile delivery environments.
Desirable
- Node.js
- Java
- Azure cloud services
- Microservices architecture
- CI/CD pipelines and DevOps practices
- Docker and Kubernetes
- Databricks exposure
- SQL and NoSQL databases
- Data engineering or platform engineering exposure
If you're interested, please use the link to apply.
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