Role Description We're hiring a Mid-Level Java, Spring Boot Engineer to work on the core backend systems that power how customers trade, move money, and interact with the Quidax platform. You'll join a team working on the flows that matter most: APIs, integrations, transaction processing, and the reliability of systems that real customers depend on every day. It's a great role for an engineer who's ready to go deeper, take real ownership, and grow fast in a fintech environment. What You’ll Be Owning - Learn and Contribute - First 30 days: Get across the core Java/Spring Boot services, understand the critical flows, and ship your first meaningful fix. - By month 3: Own specific features or services end to end, with support from the team where needed. - By month 6: Independently investigate and resolve reliability issues across APIs, integrations, and transaction flows. - Reliability and Code Quality - Reduce recurring issues: stuck transactions, failed callbacks, unclear states, and manual escalations. - Improve test coverage across critical flows and leave every area you touch cleaner than you found it. - Add observability where it's weak: better logging, alerts, and debugging hooks. - Team and Growth - Participate in code reviews, share what you learn, and support engineers around you. - Grow your understanding of transaction heavy systems: idempotency, retries, state machines, and reconciliation. Biggest Challenges You’ll Tackle - Working on backend systems where failures have real customer impact. - Debugging complex, transaction heavy flows that aren't always well documented. - Balancing new feature work with improving the stability of existing systems. - Learning fintech and crypto infrastructure concepts on the job and applying them quickly. Qualifications - 3 to 5 years of Java Spring Boot backend experience in production environments. - You write clean code, debug with patience, and care about how your work affects real users. - Comfortable with REST APIs, background jobs, database design, testing, and debugging. - Methodical debugger: you trace flows, read logs, and find the real root cause. - You improve code incrementally without defaulting to a full rewrite. Requirements - Bonus: Experience in fintech, payments, crypto, or transaction heavy backend systems. - Nice to Haves: - Familiarity with transaction concepts: idempotency, retries, reconciliation, state machines. - Experience working in a remote startup environment. - Any exposure to crypto exchanges, payment providers, bank integrations, or Java ecosystem tools like Kafka, JPA, or Hibernate. Reporting Line You'll report to the Engineering Manager and work closely with senior engineers, product managers, and mobile and frontend teammates to build and strengthen the core of our backend infrastructure. Benefits - Competitive salary based on your skills and experience; annual merit-based reviews to keep your growth visible and rewarded. - 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. - Fully remote forever + flexible working hours. - Unlimited paid time off + Nigerian national holidays. - Parental, sick, compassionate, and life event leave; we show up for you. - Quarterly remote team hangouts + annual offsite; interest-based communities (SIGs). - Regular engagement surveys; your voice matters. - Health & life coverage in select locations. 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. What our hiring process looks like - First Connect (with the Recruiter) - 30 mins: Let’s talk about your experience, your story, and how you might fit at Quidax. - Technical Chat - 120 mins: Talk us through your real wins, show us how you solve problems, live with the team. - Culture Chat - 45 mins: You get the chance to meet members of our leadership team and y’all can talk shop.

• Design, develop, and maintain scalable backend services and APIs using C# and .NET 10 • Build and maintain secure, reliable integrations with third-party systems and external APIs • Define and implement resilient and fault-tolerant API communication patterns • Troubleshoot and resolve complex backend and API issues, including connectivity and data consistency problems • Ensure systems are observability-first through effective logging, metrics, monitoring, and alerting • Create and maintain clear API integration documentation for internal and external stakeholders • Collaborate closely with Product Managers, QA Engineers, Designers, and Data teams to deliver high-quality features • Champion engineering best practices across testing, CI/CD, secure coding, and maintainability • Mentor junior developers and contribute to overall engineering excellence • Support ongoing platform scalability, integration, and performance improvement initiatives • Contribute to the evolution of the company’s API platform and backend architecture

• Design and develop scalable back-end systems and APIs. • Deliver production-ready code, driving forward new features and capabilities. • Own the full software development lifecycle, from initial design through long-term maintenance. • Ensure all components are built to withstand high volume and real-time demands. • Collaborate cross-functionally to align technical execution with product goals.

• Design, develop, and maintain high-performance database systems • Write complex PL/SQL queries and optimize database performance • Build secure storage structures to support business applications • Develop, optimize, and maintain database code for Oracle and MS SQL Server platforms • Perform index rebuilds, update statistics, and optimize schema structures • Monitor database growth, fragmentation, and query performance • Review, analyze, and optimize complex SQL queries • Design, manage, and maintain database objects • Develop and maintain stored procedures, functions, and packages • Manage database indexing strategies with application teams • Implement data archival, purging, and retention strategies • Perform cleanup of unused database objects • Assess and validate database changes • Coordinate database changes during SDLC, Agile, and DevOps release cycles • Analyze database resource utilization and support capacity planning • Perform impact analysis for schema modifications • Collaborate with System DBA and application teams • Ensure compliance with regulatory and audit requirements