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ARQ

Senior Software Engineer, Java

ARQ

Backend Engineer focusing on developing secure backend systems for fintech products. Collaborating on REST API and microservices using Java technology stack in a hybrid work setup.

Posted 8/3/2026full-timeKrakow • 🇵🇱 PolandSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Proficient in Backend Development with a strong focus on Java, REST API construction, and microservices architecture. Demonstrates expertise in clean code practices, TDD, DDD, and continuous integration & delivery methodologies.

Highest-signal resume keywords
Backend DevelopmentJavaREST API DevelopmentSpring BootPostgres Database

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend DevelopmentJavaREST API DevelopmentMicroservices ArchitectureClean Code PracticesTest-Driven Development (TDD)Domain-Driven Design (DDD)Continuous IntegrationContinuous DeliveryDatabase Management
Soft Skills
Quick LearnerResults DrivenExcellent Communication SkillsVerbal CommunicationWritten Communication
Tools & Technologies
Spring BootPostgres
Certifications & Qualifications
Bachelor's Degree in Computer ScienceBachelor's Degree in MathematicsBachelor's Degree in PhysicsBachelor's Degree in Engineering
Industry Keywords
Greenfield DevelopmentCard PaymentsTreasury ManagementTransactions BookingCrypto LiquidityHypergrowth Startups

Tech Stack

Tools & technologies
JavaMicroservicesPostgresSpringSpring BootSpringBoot

About the role

Key responsibilities & impact
  • 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

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

Benefits

Comp & perks
  • Competitive salary and benefits
  • 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
  • Office Policy: 3-4 days a week in-office