Senior Software Engineer (Java)

Uncover; Greater London; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Stock options

Discretionary bonus

Latest tools and technology

World-class team

Job summary

ARQARQ is seeking a Backend Engineer to design, develop, and maintain scalable backend systems powering our fintech products. You will build REST APIs, microservices, and evolve critical systems like payments, treasury, and transactions with a Java-based stack, Spring Boot, and PostgreSQL.

The role emphasizes clean code, test-driven development, and rapid delivery, with opportunities to impact millions of users in a hyper-growth startup. Office-based with 3–4 days in-office per week in London.

Qualifications

• Backend development experience with Java.
• Degree in CS/Math/Physics or engineering/science.
• Fluent English communication and fast-learning.
• Experience building complex products used by millions in hypergrowth startups.

Responsibilities

• Design, develop, and maintain scalable backend systems.
• Build REST APIs and microservices.
• Collaborate with team to improve systems with clean code and CI/CD.

Skills

Java

Education

Bachelor's degree or higher in CS/Math/Physics or Engineering/Science

Tools

PostgreSQL

Spring Boot

Job description

About ARQARQ is one of the fastest-growing fintechs in the world. Our mission is to redefine how people interact with money across borders, building the infrastructure to move value seamlessly. We’re still early in our journey, which means every person who joins shapes the future of our product, culture, and growth. If you’re excited by big challenges, global impact, and the chance to grow fast with a world-class team, ARQ is the place to do it.

What we're looking for

As a Backend Engineer, you’ll design, develop, and maintain scalable, secure, and high-performing backend systems that power our innovative products. You’ll collaborate with a talented team to create solutions that drive financial inclusion and transform the way people manage their money.

What you'll be doing

The work will focus on greenfield development and improvement of existing systemsProjects 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 databaseWe rely on Spring Boot for quick and quality deliveryWe 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

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

• 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