Senior Kotlin​/Scala Engineer

Senior Scala / Kotlin Engineer

6-12 months

Hybrid - London (2-3 days per week on site)

Paying up to £600 per day (Inside IR35)

We are supporting a global tier 1 bank on the hire of a Scala / Kotlin Engineer to join a high‑performing engineering team delivering business‑critical systems. This is a hands‑on engineering role focused on building and evolving distributed backend systems in a high‑performance environment.

You will be working on a distributed calculation engine used for complex index‑level computations based on quantitative models.

• Distributed, manager‑worker architecture.
• Built using Scala and Python components.

High requirements around:

• Performance
• Accuracy
• Security

This is a feature development role, not BAU/support, with significant scope to influence system design and evolution.

• Design, build, and evolve core distributed services.
• Deliver high‑quality code with strong test coverage and reliability.
• Contribute to secure system design and implementation.
• Work closely with engineers and stakeholders to define solutions.
• Participate in code reviews and technical design discussions.
• Own delivery of complex features end‑to‑end.

• Strong experience as a senior backend engineer.
• Proven hands‑on experience with either Scala or Kotlin.
• Strong understanding of type systems, concurrency, functional and/or object‑oriented programming.
• Experience building distributed backend systems.
• Strong engineering practices – clean code, unit and integration testing, CI/CD.

Scala / Kotlin, Python (supporting components), distributed systems architecture, CI/CD and modern engineering practices.

Strong hands‑on engineer who is comfortable working in small, high‑performing teams, able to own delivery independently, and who has experience in financial services or other complex domains is beneficial.