Software Engineer (Java)

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

Benefits offered by this job

Competitive salary

Own development process

Latest technology

Strong team

Job summary

ARQ is seeking a Backend Engineer to design, develop, and maintain scalable Java-based backend systems powering our fintech products. You will build REST APIs, microservices, and work on systems like payments and treasury management. Strong emphasis on TDD, DDD, and CI/CD.

You should have a Bachelor's degree in CS/Math/Physics or engineering, fluent English, and a track record of delivering complex products used by millions in hypergrowth startups. Competitive salary and modern tech.

Qualifications

• Demonstrable Backend development experience with Java.
• Bachelor's degree in CS/Math/Physics or engineering/science.
• Fluent English in speaking and writing.
• Proven track record building complex products used by millions in hypergrowth startups.

Responsibilities

• Focus on greenfield development and improving existing systems.
• Build REST APIs and microservices; evolve systems critical to business (payments, treasury, transactions, crypto liquidity).
• Backend stack on Java 25 with Postgres; use Spring Boot for rapid delivery.
• Embrace clean code, TDD, DDD, CI/CD and maintainability.

Skills

Java

English fluency

Strong communication

Experience with high-traffic apps

Education

Bachelor's degree in CS/Math/Physics/Engineering/Science

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