Software Engineer (Java)

ARQ; Kraków; On-site; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Competitive salary

Own the development process that will影

Latest technology to work with

Strong team that will help you improve

Job summary

ARQ is a rapidly growing fintech redefining how people move money across borders. We seek a Backend Engineer to design and maintain scalable, secure backend systems powering our products in Kraków.

You’ll work on greenfield projects and modernize existing platforms, building REST APIs and microservices with Java, Spring Boot, and a Postgres stack, while emphasizing clean code and fast, reliable delivery.

Qualifications

• Proven backend development experience with fluency in Java.
• Bachelor's degree in Computer Science, Mathematics, Physics, or other Engineering/Science disciplines.
• Fast learner with an ambitious, results-driven attitude and strong English communication (verbal and written).
• Track record of building complex products used by millions in hypergrowth startups.

Responsibilities

• Greenfield development and improvement of existing systems.
• Build REST APIs, engineer microservices and evolve systems our business depends on (card payments, treasury management, transactions booking, crypto liquidity).
• Tech stack relies on Java on the backend with Postgres database; Spring Boot for delivery; focus on clean code, maintainability, and CI/CD with TDD and DDD.

Skills

Backend development

Java

Communication skills

English fluency

Education

Bachelor's degree (CS/Math/Physics or related)

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.

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