Senior Software Engineer (Java)

Jackalope Digital LLC; Greater London; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Stock options

Discretionary performance bonus

The latest tools and technology

World-class team

Office policy: 3–4 days in-office

Job summary

ARQ, a fast-growing fintech, is hiring a Backend Engineer in the United Kingdom. You will design and maintain scalable backend systems powering our cross-border money movement products.

You’ll work with a strong team to deliver secure, high-performing services that enable global financial inclusion. The role focuses on greenfield development and improving existing systems, building REST APIs and microservices, and evolving systems like card payments, treasury, and crypto liquidity using Java 25,

Qualifications

• Fluent in backend development with Java
• Bachelor's degree or above in CS/Math/Engineering
• Strong communication skills in English (written and spoken)
• Experience building complex products used in hypergrowth environments

Responsibilities

• Greenfield development and improvement of existing systems
• Build REST APIs and microservices for core fintech features
• Evolve systems including card payments, treasury, transactions booking and crypto liquidity
• Use Java/Spring Boot with PostgreSQL, emphasize clean code, TDD and CI/CD

Skills

Java

Backend development

REST APIs

Spring Boot

Architecture patterns

Education

Bachelor's degree in Computer Science or related field

Tools

PostgreSQL

Job description

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.

What we're looking for

As a Backend Engineer, you’ll design, develop, and maintain scalable, secure, and high-performing backend systems that power our innovative products. You’ll collaborate with a talented team to create solutions that drive financial inclusion and transform the way people manage their money.

What you'll be doing

• The work will focus on greenfield development and improvement of existing systems

• Projects will include building REST APIs, engineering microservices and evolving a number of systems that our business depends on (e.g. card payments, treasury management, transactions booking, crypto liquidity)

• Our technology stack is based predominantly on Java 25 on the backend with Postgres database

• We rely on Spring Boot for quick and quality delivery

• We have a pragmatic approach to develop our business logic, focusing on clean code, with emphasis on maintainability and fast turnaround with TDD, DDD and continuous integration & delivery

What you'll need

• Demonstrable experience in Backend development, with fluency in Java

• Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or other Engineering / Science disciplines

• Quick learner with an ambitious and results driven personality, with excellent communication skills (english fluency, verbal and written)

• Track record of building complex products that millions of people use in hypergrowth startups

Benefits

• Competitive salary and benefits

• Stock options, so you own part of what you build

• Discretionary performance bonus

• The latest tools and technology

• A world-class team that will challenge and grow your skills

• The opportunity to help build the best fintech app in Latin America

• Office Policy: 3-4 days a week in-office

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