Software Engineer (Java Backend)

Jackalope Digital LLC; Greater London; Hybrid; GBP 75,000 - 110,000; Full time

Benefits offered by this job

Competitive salary

Sign-on stock options bonus

Discretionary performance bonus (stock

Paid annual leave

Own the development process that will

Job summary

ARQ is seeking a Backend Engineer to design and maintain scalable, secure backend systems powering our fintech products. You will collaborate with a talented team to deliver high-impact solutions for global financial inclusion.

The role focuses on greenfield work, building REST APIs and microservices, with Java and Postgres at the core, and Spring Boot to ensure fast, quality delivery in a hypergrowth environment.

Qualifications

• Demonstrable experience in backend development with fluency in Java.
• Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or related field.
• Excellent communication skills and English fluency (verbal and written).
• Track record of building complex products used in hypergrowth startups.

Responsibilities

• Greenfield development and improvement of existing systems.
• Build REST APIs, engineer microservices, and evolve critical systems (e.g., card payments, treasury management, transactions booking, crypto liquidity).
• Backend stack centers on Java with Postgres; Spring Boot used for rapid, quality delivery.
• Emphasizes clean code, maintainability, and fast turnaround with TDD, DDD, and CI/CD.

Skills

Backend development

Java

English fluency

Startup experience

Education

Bachelor's degree in CS/Math/Physics or related field

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

• Sign-on stock options bonus, so you become part of the success of the company

• 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