Software Engineer (Java)

jobr.pro; Kraków; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Competitive salary

Latest technology

Strong team support

Job summary

ARQ is seeking a Backend Engineer to design, develop, and maintain scalable, secure backend systems powering our fintech products in Kraków. You will build REST APIs and microservices using Java 25 and PostgreSQL, with Spring Boot driving fast, quality delivery.

Join a team that values maintainable code, TDD, and a pragmatic approach to business logic. This role offers a hands-on opportunity to shape products used by millions while growing with a fast-growing fintech.

Qualifications

• Fluency in English (verbal and written) and strong communication skills.
• Bachelor's Degree or above in CS, Math, Physics, or related field.
• Demonstrable experience in backend development with Java."
• Track record of building complex products used in hypergrowth environments.

Responsibilities

• Greenfield development and improvement of existing systems.
• Build REST APIs and engineering microservices for multiple business-critical systems.
• Evolve systems such as payments, treasury, and transactions booking.
• Work with Spring Boot, Postgres, and test-driven development practices.

Skills

Java

Backend development

English communication

Hypergrowth experience

Education

Bachelor's degree in CS or related field

Tools

Spring Boot

PostgreSQL

REST APIs

Microservices

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

• 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