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ARQ

Software Engineer, Java

ARQ

. Design, develop, and maintain scalable, secure, and high-performing backend systems .

Posted 10/26/2026full-timeKrakow • PolandMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in Backend Development with a strong focus on Java, Spring Boot, and PostgreSQL. Capable of designing and maintaining scalable systems while applying TDD and DDD practices in a fast-paced environment.

Highest-signal resume keywords
Backend DevelopmentJavaSpring BootPostgreSQLREST API Development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend DevelopmentJavaSpring BootPostgreSQLREST API DevelopmentMicroservices EngineeringTDDDDDClean CodeContinuous Integration
Soft Skills
Excellent Communication SkillsQuick LearnerResults Driven
Certifications & Qualifications
Bachelor's Degree in Computer Science
Industry Keywords
Greenfield DevelopmentCard 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 and engineer microservices
  • Evolve systems supporting card payments, treasury management, transaction booking, and crypto liquidity
  • Develop business logic with clean, maintainable code
  • Apply TDD and DDD practices
  • Participate in continuous integration and delivery

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, with excellent communication skills (english fluency, verbal and written)
  • Track record of building complex products that millions of people use in hypergrowth startups
  • Fluency in English, verbal and written
  • Experience with Java 25, Spring Boot, and PostgreSQL backend systems

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