Senior Software Engineer

Opus Recruitment Solutions; England; Hybrid; GBP 100,000 - 140,000; Full time

Job summary

A recruitment firm is looking for multiple Senior Java Engineers to join a start-up environment in London. You will play a key role in building and maintaining backend infrastructure using Java 21+, focusing on API design and real-time currency features. The package includes a base salary of £100k–£140k, equity, Bupa healthcare, and generous holiday leave. Strong development skills, especially in Java and Spring Boot, are essential. This is a hybrid role with one day onsite in London.

Benefits

Equity

Bupa healthcare

25 days holiday

Dinner vouchers

Qualifications

• 5+ years of experience with Java, preferably in a start-up environment.
• Proficient in building and maintaining backend infrastructure and APIs.
• Strong communications skills for team collaboration.

Responsibilities

• Design APIs to connect mobile app to backend systems.
• Implement real-time currency exchange logic.
• Contribute to greenfield projects.

Skills

Java 21+

Spring Boot

Microservices

PostgreSQL

Excellent communication skills

Tools

AWS

React

CI / CD

Job description

Senior & Lead Java Engineers - London & Hybrid

Java 21, Springboot, Microservices, TDD

Sometimes the simplest ideas are born from everyday struggles. In regions where inflation is soaring, people have long worried about their savings losing value overnight. Out of that challenge came a new kind of e‑wallet, one that allows you to hold money in dollars and protect it from devaluation.

What began as a way to safeguard savings has evolved into a tool for freedom: enabling people to travel, invest, and plan with confidence. It’s not about flashy features or big promises; it’s about peace of mind and a fair chance to participate in the global economy while protecting income.

As a Senior Java Engineer, you’ll play a key role in building this out and maintaining the backend infrastructure. You’ll work with Java 21+, designing APIs that connect the mobile app to backend systems, implementing real‑time currency exchange logic, and contributing to exciting greenfield projects.

Tech stack

Java 21, Spring Boot, Microservices, PostgreSQL, React, CI / CD, AWS.

We’re looking for strong x5 Java developers immediately (version 17+) with excellent communication skills and the ambition to thrive in a start‑up environment. The rest can be learned along the way.

Package

£100k–£140k base salary, plus equity, pension, Bupa healthcare, 25 days holiday, dinner vouchers, and more.

Interested in learning more? Or know people who might be a great fit? Please get in touch via here OR email me with your CV on rebeka.mulk @ opusrs.com.

Please note, we are looking for multiple people and it's one day onsite, in their London office – so should you know people who might be a great fit too, please steer them my way. We offer great referral fees!