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ARQ

Senior Software Engineer, Java

ARQ

. Focus on greenfield development and improvement of existing systems .

Posted 10/5/2026full-timeKrakow • PolandSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in Backend Development with a strong focus on Java, REST APIs, and microservices. Proven ability to design and maintain scalable systems while applying best practices in clean code, TDD, and continuous integration.

Highest-signal resume keywords
Backend DevelopmentJavaREST APIsMicroservicesTDD

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend DevelopmentJavaREST APIsMicroservicesTDDDDDContinuous IntegrationPostgresSpring BootClean Code
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
  • 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
  • Design, develop, and maintain scalable, secure, and high-performing backend systems
  • Collaborate with a talented team to create solutions that drive financial inclusion and transform how people manage money
  • Apply clean-code, maintainability, TDD, DDD, and continuous integration and delivery practices

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, including English fluency, verbal and written
  • Track record of building complex products that millions of people use in hypergrowth startups
  • Experience with Java 25, Postgres, Spring Boot, REST APIs, microservices, TDD, DDD, and continuous integration and delivery

Benefits

Comp & perks
  • Stock options, so you own part of what you build
  • Discretionary performance bonus
  • The latest tools and technology
  • A world-class team that will challenge and grow your skills
  • The opportunity to help build the best fintech app in Latin America