Senior Full Stack Developer

La Fosse; Greater London; Hybrid; GBP 128.000 - 168.000; Teilzeit

Zusammenfassung

La Fosse is seeking a Senior Full Stack Developer to modernise a core platform, combining hands-on React development with architectural leadership. The role focuses on creating a new React-driven frontend while integrating with existing .NET backend services and data integrations.

The successful candidate will guide the migration strategy, collaborate with product and business stakeholders, and operate in a hybrid setup with three onsite days in Waterloo, London.

Qualifikationen

• Significant commercial experience as a Full Stack Developer or Senior Software Engineer.
• Strong front-end experience building React 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.

Aufgaben

• Lead the migration of the existing Databricks-based application to a modern React‑based solution.
• Define and own the migration strategy, technical roadmap, and implementation approach.
• Assess existing architecture and recommend scalable future-state designs.
• Collaborate with stakeholders to ensure a smooth transition and minimal business disruption.
• Design, develop and maintain modern React applications.
• Build and support backend services using .NET/C# and APIs.
• Drive front-end architecture, coding standards, and component libraries.

Kenntnisse

React

.NET/C#

RESTful APIs

Node.js

Java

CI/CD

DevOps

Docker

Kubernetes

Agile

Leadership

Stakeholder comms

Tools

Docker

Kubernetes

Jobbeschreibung

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

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.

Required Experience

• Significant commercial experience as a Full Stack Developer or Senior Software Engineer.
• 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.
• Node.js
• Java
• CI/CD pipelines and DevOps practices
• Docker and Kubernetes
• SQL and NoSQL databases