Functional Programming Engineer

Functional Programming Engineer

Location: London

Working Model: Hybrid – 3 days per week in the office, with flexibility for the candidate to choose which 3 days they work onsite

Contract: 6-month rolling contract, with a further 6-month potential extension

Rate: Open to discussion based on the candidate’s expectations and experience

About the Opportunity

We are working with a leading global banking organisation on a high-profile Front Office technology programme within its Investment Banking / Capital Markets environment.

We are looking for a genuinely senior, hands-on engineer to join a high-calibre engineering team developing and enhancing a business-critical platform used by Front Office teams.

The team is particularly interested in engineers with a strong functional programming background and a solid understanding of modern software design principles.

Kotlin experience is highly relevant, but the team is also open to engineers with strong functional programming experience in languages such as Scala or Clojure who are willing and able to embrace Kotlin.

This is a senior engineering role requiring strong technical depth, experience with Event Sourcing and Event-Driven Architecture, and the ability to work directly with business stakeholders.

Key Requirements

Strong functional programming experience and understanding of functional programming principles
Strong commercial experience with Kotlin, Scala, Clojure or another functional programming language
Willingness and ability to work with Kotlin where it is not already your primary language
Deep hands-on experience with Event Sourcing
Strong understanding of Event-Driven Architecture
Experience with CQRS and modern distributed systems
Senior/VP-level engineering experience
Experience working directly with Front Office / business stakeholders
Strong experience with TDD, XP practices and collaborative engineering
Experience with pair and/or mob programming
Cloud experience, ideally GCP, with technologies such as GKE / Cloud Run
Strong backend engineering experience building reliable, scalable and maintainable systems

What You'll Be Doing

Design, build and evolve highly reliable backend services
Develop systems using Event Sourcing and Event-Driven Architecture
Apply functional programming principles to software design and implementation
Work with Kotlin and contribute to a modern, highly collaborative engineering environment
Work closely with Front Office users and business stakeholders to understand requirements and shape technical solutions
Contribute to technical design and architectural decisions
Develop clean, maintainable and well-tested code using TDD
Work collaboratively through pair programming, mob programming and other XP practices
Support production systems where reliability, correctness and availability are critical
Help shape the engineering approach and share technical expertise across the wider team

What We're Looking For

We are particularly interested in senior engineers who bring strong functional programming expertise, rather than simply looking for candidates based on a specific technology stack.

Relevant backgrounds could include:

Kotlin with strong functional programming experience
Scala / Scala-based backend engineering
Clojure
Other functional programming languages or environments, where the candidate has strong transferable engineering principles

The ability to demonstrate genuine Event Sourcing experience, strong engineering fundamentals and the ability to engage directly with business users will be particularly important.

Key Skills

This is a top-tier senior engineering opportunity for someone who combines strong technical depth with functional programming expertise, modern distributed-systems experience and the ability to work closely with Front Office stakeholders.

Apply Now

Functional Programming Engineer

Job Details