Senior Back End Developer

Senior Java / Backend Engineer - Greenfield Fintech (London Hybrid)

Salary: £95,000 – £140,000 + bonus

Location: London (Hybrid)

We’re working with a high-growth fintech accelerator within a major financial services organisation, building brand-new consumer products from the ground up. This is not a legacy transformation programme - these are genuine greenfield builds with a significant roadmap and real product ownership from day one.

We’re looking for Senior and Lead Backend Engineers to help design and build modern, scalable platforms in fast-moving, product-led squads.

Tech environment:

• Java / Kotlin (JVM ecosystem)

• Microservices architecture

• AWS / GCP cloud-native platforms

• Spring / Spring Boot

• Docker & Kubernetes

• Messaging / streaming systems

• Observability & distributed tracing tooling

What you’ll be doing:

• Designing and building resilient, distributed systems at scale

• Contributing to architectural direction across new platforms

• Writing clean, secure, production-ready code

• Driving performance, reliability, and zero-downtime delivery

• Working closely with product and cross-functional engineering teams

What we’re looking for:

• Strong backend engineering experience (Java/Kotlin preferred)

• Experience with distributed systems and cloud environments

• A strong sense of ownership and engineering quality

• Comfort working in fast-paced, evolving product environments

• Collaborative mindset with a focus on continuous improvement

This is a strong opportunity to join early in multiple greenfield builds, influence technical direction, and help shape both engineering culture and product outcomes as the teams scale.

Interested in hearing more? Get in touch with Joely at Synchro!