Lead Software Engineer, Java

ARQ

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

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

Core Competencies

Role fit

Core Competencies

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Proficient in Backend Development with a strong focus on Java, REST APIs, and microservices. Demonstrates expertise in TDD, DDD, and continuous integration and delivery, contributing to the development of scalable fintech solutions.

Highest-signal resume keywords

Backend DevelopmentJavaREST APIsMicroservicesTDD

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentJavaPostgresSpring BootREST APIsMicroservicesTDDDDDContinuous IntegrationContinuous Delivery

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

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 and engineer microservices
Evolve systems supporting card payments, treasury management, transaction booking, and crypto liquidity
Develop business logic with a focus on clean, maintainable code
Collaborate with a talented, world-class team to create fintech solutions that drive financial inclusion
Contribute to rapid delivery through TDD, DDD, and continuous integration and 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
Proficiency with Java 25, Postgres, and Spring Boot
Experience with REST APIs and microservices
Experience with TDD, DDD, and continuous integration & delivery
Based in London or another city in the UK, as indicated by the application options

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