Software Engineer (Java Backend)

Posted 3 Days Ago
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London, Greater London, England, GBR
Hybrid
Mid level
Fintech • Software • Financial Services
The Role
Design, develop, and maintain scalable backend systems (greenfield and existing). Build REST APIs and microservices for payments, treasury, transaction booking, and crypto liquidity. Use Java 25, Spring Boot, and Postgres with TDD, DDD, and CI/CD to deliver maintainable, high-performance services.
Summary Generated by Built In
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

Skills Required

  • Fluency in Java (Java 25)
  • Backend development experience building REST APIs and microservices
  • Experience with Spring Boot
  • Experience with Postgres (PostgreSQL)
  • Familiarity with TDD, DDD, and CI/CD practices
  • Bachelor's degree in Computer Science, Mathematics, Physics, or Engineering/Science
  • English fluency (verbal and written)
  • Proven track record building complex products at scale in hypergrowth startups
  • Ability to work in-office 3-4 days per week (hybrid)
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The Company
HQ: New York, New York
153 Employees

What We Do

ARQ opens the world's strongest assets and markets to travelers, investors, and professionals in the Americas – so they can grow their money wherever they are.

Why Work With Us

We believe that small teams with the best talent outcompete massive companies with mediocre capabilities. That's why we have gathered a set of people who have done it before at iconic companies. In our quest to reshape the global financial system we have raised tens of millions of dollars from leading investors (Sequoia Capital, Founders Fund, etc)

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