Senior Software Engineer, Java

ARQ

Senior Java Engineer building scalable backend systems for ARQ’s cross-border fintech platform. Developing APIs, microservices, and financial infrastructure with Java, Spring Boot, and PostgreSQL.

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

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 practices, TDD, and DDD. Experienced in building REST APIs and microservices to support financial applications and enhance user experience.

Highest-signal resume keywords

Java 25PostgreSQLSpring BootBackend DevelopmentREST API Development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentJava 25PostgreSQLREST API DevelopmentMicroservices EngineeringClean CodeTest-Driven Development (TDD)Domain-Driven Design (DDD)Continuous IntegrationContinuous Delivery

Soft Skills

Excellent Communication SkillsQuick LearnerAmbitiousResults Driven

Certifications & Qualifications

Bachelor's Degree in Computer ScienceBachelor's Degree in MathematicsBachelor's Degree in PhysicsBachelor's Degree in Engineering

Industry Keywords

Financial InclusionMoney ManagementCard 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 and PostgreSQL
Use Spring Boot for delivery
Develop business logic with clean code, TDD, DDD, and continuous integration and delivery
Collaborate with a talented team to create solutions that drive financial inclusion and transform money management

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