We're seeking a highly experienced Senior React & .
NET Technical Lead to join a major transformation programme, helping drive the migration of an existing application into a modern React-based architecture.
This is far more than a traditional development role. You'll play a key part in defining the technical vision, shaping architecture, leading the migration strategy, establishing infrastructure and deployment pipelines, and mentoring engineers throughout the delivery life cycle.
Contract Details
- Initial 6-month contract
- Strong extension potential up to 3 years
- Hybrid working
- London Waterloo
- Competitive day rate
The Opportunity
You'll be leading the migration of an existing application currently running within a Databricks environment to a scalable, enterprise-grade React and .
NET solution.
The successful contractor will combine hands-on engineering expertise with technical leadership, taking ownership of solution design, delivery approach, and team guidance.
You'll be joining an established engineering function of around 12 engineers and will play a critical role in driving best practices across application development, architecture, DevOps, and modern software delivery.
Key Responsibilities
- Lead the migration from Databricks Apps to a React-based application
- Design and architect scalable end-to-end solutions
- Build and modernise React Front End applications
- Develop and enhance .NET Back End services
- Define deployment, infrastructure and CI/CD strategies
- Make key architectural and technical decisions
- Mentor and support junior developers and engineers
- Collaborate closely with data engineering teams
- Drive technical excellence throughout the programme
Essential Skills & Experience
- Strong commercial experience with React
- Strong Back End engineering expertise with .NET
- Proven experience leading technical projects, application modernisation or migration initiatives
- Ability to design, architect and deliver end-to-end solutions
- Experience establishing infrastructure, deployment processes and CI/CD pipelines
- Strong stakeholder communication and technical leadership skills
Desirable Experience
- Data-focused environments and platforms
- AI-enabled development practices or AI-driven solutions
- Node.js
- C#
- Java
- Trading or financial markets experience
Ideal Background
- Leading application transformation or modernisation programmes
- Building complex React applications from the ground up
- Designing and developing enterprise .NET services
- Owning architectural decisions across the full technology stack
- Creating scalable deployment and DevOps frameworks
- Mentoring engineering teams and influencing technical direction
- Working alongside data engineering and analytics teams
What We're Looking For
The ideal candidate is someone who can confidently say:
"I've taken applications from Legacy architectures, designed the target-state solution, established the React/.
NET technology stack, implemented deployment strategies, and led engineering teams through successful delivery."]},{
If you're a senior hands-on engineer who enjoys combining architecture, leadership and development expertise while helping shape a long-term strategic programme, we'd love to hear from you.