Senior Software Engineer (Java)

London💼 Full-time🗓 2026-09-21 → 2026-09-25

Core

Design, develop, and maintain scalable, secure, and high-performing backend systems for fintech products including card payments, treasury management, and crypto liquidity.

Role type

Senior IC backend engineer (Java)

Builds

REST APIs, microservices, and core business systems for financial infrastructure

Domain

Fintech / Financial Services

Deliverable

production ML models | product features

Required skills

Java, Spring Boot, Postgres, REST API design, microservices architecture, TDD, DDD, CI/CD

Preferred skills

Experience in hypergrowth startups, building complex products for millions of users

Technologies

Java 25, Spring Boot, Postgres

Responsibilities

Design and develop greenfield backend systems; improve existing systems; build REST APIs and microservices; implement business logic with clean code principles

Seniority

Senior, hands-on IC

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About arq

ARQ is one of the fastest-growing fintechs in the world. Our mission is to redefine how people interact with money across borders, building the infrastructure to move value seamlessly. We're still early in our journey, which means every person who joins shapes the future of our product, culture, and growth. If you're excited by big challenges, global impact, and the chance to grow fast with a world-class team, ARQ is the place to do it.