- Company: The Tonic Technologies (TTT) Limited
- Location: Lagos, Nigeria (Remote)
- Job type: Full-time
- Deadline: 5 November 2026
About the role
The Tonic Technologies (TTT) Limited is a Nigerian FinTech company that provides accessible financial solutions, including gift card trading, virtual dollar cards, and cross-border payments. We are looking for a Senior Backend Engineer to build and maintain the core systems that power these services for over a million users in Nigeria and Ghana.
This is a fully remote, full-time position based in Lagos. You will work with a team that values reliability, security, and user experience, ensuring that financial transactions are seamless and accurate.
Responsibilities
- Build and maintain backend services for payments, wallet funding, withdrawals, KYC, and card funding.
- Design and optimize REST APIs for our consumer app, internal admin dashboard, and partner/B2B platforms.
- Ensure system reliability by handling idempotency, retries, and race conditions in production environments.
- Monitor and debug production issues, including tracing webhooks and optimizing database queries.
- Collaborate with frontend and operations teams to deliver clean, well-documented, and stable services.
Requirements
- 6+ years of experience building backend systems in Node.js with TypeScript.
- Strong understanding of security, authentication, access control, and audit trails.
- Experience integrating third-party APIs and webhooks, with a focus on handling failures and duplicates.
- Familiarity with Docker, GitOps (Argo CD), and Kubernetes deployment workflows.
- Proficiency with tools like Yarn, ESLint, Prettier, and GitHub pull request reviews.
- Ability to explain technical trade-offs to non-technical stakeholders.
How to apply
Interested and qualified candidates should apply online via the link below. Please note that the application will ask for your GitHub or portfolio, along with a short answer about a production bug or incident you have fixed. The application deadline is 5th November, 2026.
