Senior Backend Engineer, Distributed Systems (London)

Dex; Greater London; Hybrid; GBP 110,000 - 180,000; Full time

Job summary

Dex is recruiting for a London-based, hybrid role in a trusted partner company. You will join one of three engineering squads as a backend-focused Product Engineer, shaping architecture, production metrics, and scalable workflows for AI agents.

The role emphasizes serious distributed systems work, concurrency control, and end-to-end delivery. You should have a proven track record at Senior or Staff level in distributed backend design, with FP experience and comfort in languages like Elixir,

Qualifications

• Proven track record designing and operating distributed backend systems under high concurrency.
• Strong understanding of functional programming concepts and FP languages.
• Ability to balance performance, reliability and product requirements.

Responsibilities

• Architect high-throughput pipelines with strong traceability and auditability.
• Address concurrency and multi-tenant scheduling at scale.
• Build deterministic audit engines linking outputs to source data.
• Define guardrails, test gates, and reliability boundaries for production systems.
• Own features end-to-end from discovery to production monitoring.

Skills

Senior backend design

Distributed systems

Concurrency & latency

Functional programming (Elixir bonus)

Tools

Elixir

Scala

Clojure

Haskell

Job description

Dex is recruiting for a London-based, hybrid role in a trusted partner company. You will join one of three engineering squads as a backend-focused Product Engineer, shaping architecture, production metrics, and scalable workflows for AI agents.

The role emphasizes serious distributed systems work, concurrency control, and end-to-end delivery. You should have a proven track record at Senior or Staff level in distributed backend design, with FP experience and comfort in languages like Elixir,