Senior/Staff Java Engineer

Quidax; City Of London; Remote; GBP 70,000 - 90,000; Full time

Job summary

A leading crypto finance company based in London is seeking a Senior Java Engineer to enhance their core backend systems. The role involves building and scaling services, collaborating with product and engineering teams, and solving performance challenges. Ideal candidates should have over 8 years of experience, primarily with Java and SpringBoot, and a passion for impactful system design. This position offers a remote-first environment with competitive pay and unlimited paid time off.

Benefits

Competitive salary

Unlimited paid time off

Flexible working hours

Personal development fund

Health and life coverage

Quarterly team hangouts

Qualifications

• 8+ years in software engineering with a focus on Java and SpringBoot.
• Experience architecting solutions to ambiguous problems.
• Proficiency in writing scalable and performant code.

Responsibilities

• Build and scale core backend services for Quidax.
• Lead improvements for latency and reliability.
• Collaborate with product and engineering teams.

Skills

Java 8+

SpringBoot

System design

Microservices architecture

Distributed systems

Relational databases (MySQL)

Job description

About Quidax

Quidax is where money meets limitless possibilities. We’re making it super easy for individuals, businesses, and fintechs in Africa to access crypto. Our goal? Providing real value for our customers today while shaping the future of money.

About the Role

We’re hiring Senior / Staff-level Java Engineers who love building performant backend systems that run 24/7 and power millions in crypto and fiat transactions. You’ll be joining the core backend team that underpins every Quidax product — from deposits and swaps to merchant payments and our API rails. It’s a high-trust, high-impact role for engineers who want to do the best work of their careers.

What You’ll Be Owning

• Build & Scale Core Services
  • First 30 days: Understand our architecture and take ownership of one core service (deposits, swaps, or settlements)
  • By month 3: Lead improvements that reduce latency or improve reliability across one critical flow
  • By month 6: Design and implement a new microservice (or refactor an existing one) that handles high-volume traffic across fiat and crypto rails
  • Articulate a long term vision for maintaining and scaling our backend systems and the teams running them.

• Solve for Performance, Reliability & Observability
  • By month 2: Contribute to platform observability initiatives
  • By Q1 2026: Drive cross-team initiative to scale platform performance across all critical user flows

• Collaborate with Product & Engineering Teams
  • Actively lead and participate in architecture reviews, sprint planning, and retros
  • Pair with frontend, mobile, and devops engineers to solve cross-functional challenges
  • Support junior engineers via reviews, mentoring, and documentation

• Biggest Challenges You’ll Tackle
  • Architect and develop distributed systems
  • Provide technical structure to teams and work closely with management and stakeholders to define strategic roadmaps
  • Manage individual projects priorities, deadlines and deliverables with your technical expertise
  • Write high quality, well tested code to meet the needs of your customers
  • Shipping often while keeping a high bar for quality and security

• What We’re Looking For

  You write clean code. You sweat the small stuff when it matters. You obsess over system design. And you care about impact.

  • 8+ years in software engineering, primarily working with Java 8+ & SpringBoot in production
  • Experience architecting and developing solutions to ambiguous problems with significant impact
  • Experience writing and maintaining highly scalable and performant code
  • Strong grasp of system design, microservices architecture, and distributed systems
  • Proficiency in relational databases (MySQL)
  • Bonus if you’ve worked in fintech, crypto exchanges, or high-availability systems

• Nice-to-haves:
  • Familiarity with blockchain integrations or custody wallets
  • Experience working in a remote startup environment
  • Contributions to open-source projects or technical writing

• Reporting Line

  You’ll report to the Engineering Manager. You’ll jam regularly with senior engineers, product managers, and mobile/frontend teammates to build the backbone of our infrastructure.

Why Quidax

At Quidax, we’re building the future of finance in Africa through crypto. You’ll have the freedom to innovate, the space to lead, and the backing to build something that truly scales. If you’re ready to build an engineering org that delivers excellence at scale—let’s talk.

What’s In It For You

When you join Quidax, you’re not just taking a job — you’re jumping into a community that’s bold, remote-first, and building for the future. Here’s what you get:

• Fair Pay + Ownership
  Competitive salary based on your skills and experience; annual merit-based reviews to keep your growth visible and rewarded

• Growth That’s Real
  Annual performance reviews + clear promotion cycles; recognition for great work — from shoutouts to milestone rewards
• Personal development fund (courses, books, conferences); study leave so you can keep learning

• Work That Works For You
  Fully remote forever + flexible working hours

• Time Off That Respects Life
  Unlimited paid time off + Nigerian national holidays
  Parental, sick, compassionate, and life event leave — we show up for you

• Connection That Feels Real
  Quarterly remote team hangouts + annual offsite; interest-based communities (SIGs)
• Regular engagement surveys — your voice matters
• Health & life coverage in select locations

TL;DR: You’ll do meaningful work, grow fast, and have the flexibility to live your best life — all while building something big with people who care.

Let’s build the future of finance together

How to apply

We love seeing applications that speak directly to us. It’s easy for your application to get lost in a sea of generic ones, especially when we’re sorting through dozens of them. So, make yours stand out! Show us your personality, your passion, and why you’re the perfect fit. We appreciate the effort it takes to create something thoughtful and unique.

If you make it through to the next stage, you’ll likely get a pre-interview questionnaire. Think of it as a chance to show us how you’d approach the challenges we face here at Quidax. Imagine you’re already part of the team and walk us through your thought process as you tackle the problems we throw your way.

What our hiring process looks like

It’s a four-step process!

1. First Connect (with the Recruiter) - 30 mins. Let’s talk about your experience, your story, and how you might fit at Quidax.

2. Skills Assessment - Work through a practical scenario; show us your process.

3. Technical Interview - 60 - 90 mins. Show us how you solve problems, live with the team.

4. Culture Chat - 45 - 60 mins. Get to know Quidax culture and the people you’ll work with.

Stay connected with Quidax through LinkedIn and Instagram for the latest updates.