Software Engineer, Java Backend

ARQ

Backend Engineer building Java microservices, APIs, and transaction systems for ARQ, a global fintech. Developing secure infrastructure for payments, treasury, crypto liquidity, and cross-border money movement.

Posted 9/10/2026full-timeLondon • 🇬🇧 United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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

Proficient in Backend Development with a strong focus on Java 25, PostgreSQL, and Spring Boot, emphasizing clean code and best practices like TDD and DDD. Experienced in building REST APIs and microservices to support financial systems and enhance user experience.

Highest-signal resume keywords

Java 25PostgreSQLSpring BootBackend DevelopmentREST API Development

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Backend DevelopmentJava 25PostgreSQLREST API DevelopmentMicroservices EngineeringTDDDDDContinuous IntegrationContinuous DeliveryClean Code Practices

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 LiquidityHypergrowth Startups

Tech Stack

Tools & technologies

JavaMicroservicesPostgresSpringSpring BootSpringBoot

About the role

Key responsibilities & impact

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
Develop predominantly with Java 25 on the backend and PostgreSQL
Use Spring Boot for delivery
Develop business logic with emphasis on clean, maintainable code
Apply TDD and DDD
Use continuous integration and delivery
Collaborate with a talented team to create solutions that drive financial inclusion and transform how people manage money

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

Benefits

Comp & perks

Competitive salary
Sign-on stock options bonus
Discretionary performance bonus (stock options)
Paid annual leave
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