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ARQ

Software Engineer, Java

ARQ

Backend Java engineer building REST APIs and microservices for ARQ’s cross-border fintech infrastructure. Improving payment, treasury, transaction, and crypto-liquidity systems.

Posted 8/24/2026full-timeKrakow • 🇵🇱 PolandMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Proficient in designing and developing scalable backend systems using Java and PostgreSQL, with a strong focus on clean code, maintainability, and the application of TDD and DDD methodologies. Demonstrates excellent communication skills and the ability to collaborate effectively within a team to drive financial inclusion solutions.

Highest-signal resume keywords
Java 25PostgreSQLSpring BootBackend DevelopmentREST API Development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend DevelopmentJava 25PostgreSQLREST API DevelopmentMicroservices EngineeringClean Code PracticesTest-Driven Development (TDD)Domain-Driven Design (DDD)Continuous IntegrationContinuous Delivery
Soft Skills
Excellent Communication SkillsQuick LearnerResults Driven
Certifications & Qualifications
Bachelor's Degree in Computer ScienceBachelor's Degree in MathematicsBachelor's Degree in PhysicsBachelor's Degree in Engineering
Industry Keywords
Financial InclusionCard PaymentsTreasury ManagementTransaction BookingCrypto Liquidity

Tech Stack

Tools & technologies
JavaMicroservicesPostgresSpringSpring BootSpringBoot

About the role

Key responsibilities & impact
  • Design, develop, and maintain scalable, secure, and high-performing backend systems
  • Focus on greenfield development and improvement of existing systems
  • Build REST APIs
  • Engineer microservices
  • Evolve systems supporting card payments, treasury management, transaction booking, and crypto liquidity
  • Work predominantly with Java 25 and PostgreSQL
  • Use Spring Boot for delivery
  • Develop business logic with clean code and emphasis on maintainability
  • Apply TDD, DDD, and continuous integration and delivery
  • Collaborate with a talented team to create solutions supporting financial inclusion

Requirements

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
  • Excellent communication skills
  • English fluency, verbal and written
  • Track record of building complex products that millions of people use in hypergrowth startups

Benefits

Comp & perks
  • 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