Lead Software Engineer(Java)

ARQ; United Kingdom; On-site; GBP 70,000 - 120,000; Full time

Benefits offered by this job

Stock options

Discretionary performance bonus

Latest tools & technology

World-class team

Job summary

ARQ is seeking a Backend Engineer to design, develop, and maintain scalable backend systems powering our fintech products. You will work with a talented team to deliver secure, high-performing services and APIs in a fast-moving startup environment.

The role focuses on greenfield projects and improving existing systems, with Java on the backend, Spring Boot, and Postgres. Expect TDD, DDD, and CI/CD to drive quality and speed.

Qualifications

• 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 ambitious and results-driven personality, with excellent communication skills (English fluency).
• Track record of building complex products used by millions in hypergrowth startups.

Responsibilities

• Engage in greenfield development and evolution of existing systems.
• Build REST APIs, engineer microservices, and evolve critical backend components.
• Support systems such as payments, treasury, transactions booking, and crypto liquidity with scalable solutions.
• Deliver with a pragmatic approach, clean code, maintainability, and fast CI/CD cycles.

Skills

Backend development

Java

REST APIs

Microservices

TDD

DDD

Education

Bachelor's Degree in Computer Science, Mathematics, Physics or related engineering/science

Tools

Spring Boot

PostgreSQL

Job description

About ARQ

ARQ 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 systems

Projects 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 database

We rely on Spring Boot for quick and quality delivery

We 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