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ARQ

Software Engineer, Java

ARQ

Backend Java Engineer building scalable APIs and microservices for ARQ’s cross-border fintech infrastructure. Developing payment, treasury, transaction, and crypto-liquidity systems.

Posted 8/24/2026full-timeLondon • 🇬🇧 United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

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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 fintech engineering team.

Highest-signal resume keywords
Backend DevelopmentJava 25PostgreSQLSpring BootREST 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 LearnerAmbitiousResults Driven
Tools & Technologies
Spring Boot
Certifications & Qualifications
Bachelor's Degree in Computer ScienceBachelor's Degree in MathematicsBachelor's Degree in PhysicsBachelor's Degree in Engineering
Industry Keywords
FintechCard 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 on the backend 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 engineering team to build fintech infrastructure and products

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
  • Must be based in London, another city in the UK, or another country, as specified in the application form

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