Software Engineer (Java Backend)

Reposted 7 Days Ago
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Kraków, Małopolskie, POL
Hybrid
Mid level
Fintech • Software • Financial Services
The Role
Design, build, and maintain scalable, secure backend systems for fintech products. Focus on greenfield development and improving existing services (card payments, treasury, transactions, crypto liquidity). Build REST APIs and microservices using Java and Postgres, with Spring Boot. Emphasize clean, maintainable code, TDD, DDD, and CI/CD to deliver high-quality systems.
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

  • Own the development process that will face on the customer's impact

  • Latest technology to work with

  • Strong team that will help you improve your skills

Skills Required

  • Demonstrable experience in backend development
  • Fluency in Java
  • Experience with Spring Boot
  • Experience with Postgres
  • Experience building REST APIs and microservices
  • Familiarity with TDD and DDD practices
  • Experience with Continuous Integration and Continuous Delivery
  • Bachelor's degree in Computer Science, Mathematics, Physics, or related
  • English fluency, strong verbal and written communication
  • Track record building complex products at hypergrowth startups
Am I A Good Fit?
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The Company
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