Senior Fullstack Engineer

• Location: London (hybrid, 1 day/week in the office)
• Rate: €120 per hour
• Duration: Until 31st December 2025 (possible extensions)

About the Role

We’re looking for a Senior Software Engineer I to join our growing technology team. This role is ideal for an experienced engineer who thrives on solving complex problems, driving technical strategy, and building high-quality software that makes a real impact.

As a Senior Engineer, you’ll work across the stack with a focus on frontend technologies (~80%), while also contributing to backend, infrastructure, and system design. You’ll own services end-to-end, mentor teammates, and play a key role in shaping the technical direction of business-critical projects.

What You’ll Do

• Build and maintain scalable software applications using modern technologies.
• Take ownership of systems end-to-end, from design to deployment and monitoring.
• Solve live production issues quickly while implementing long-term reliability improvements.
• Influence architectural decisions, ensuring solutions are robust, secure, and future-proof.
• Drive continuous delivery and experimentation to deliver customer value.
• Mentor and support less experienced engineers, helping raise the technical bar across the team.
• Collaborate with cross-functional teams to identify opportunities for innovation and process improvements.

What We’re Looking For

• 5–7 years’ experience delivering complex software solutions in a senior role.
• Strong full stack development skills, with a frontend focus.
• Proven ability to design and implement scalable, reliable, and secure systems.
• Experience working in collaborative, agile environments with a strong ownership mindset.

Core Tech Stack (Must-Haves)

• Frontend: TypeScript, React, Harness
• Backend/Infrastructure: Node.js, GraphQL (Apollo), Git, Kubernetes, Docker

Nice-to-Have Skills

• Perl, Java
• SQL and database technologies

About You We’re looking for someone who:

• Is proactive and brings forward new ideas.
• Demonstrates ownership and accountability for outcomes.
• Can work independently as well as in collaborative team environments.
• Welcomes feedback and strives for continuous growth.
• Communicates effectively with both technical and non-technical stakeholders.

Why Join?

• Opportunity to work on impactful, business-critical projects.
• A collaborative environment where your ideas are valued.
• Flexibility to shape technical strategy and influence cross-team initiatives.
• A culture that supports learning, experimentation, and professional growth.