We are looking for a Backend .NET Engineer to help build large-scale products across Africa, with a focus on USSD and telco charging in Rwanda.

YOUR IMPACT

• Design and build backend services at scale, owning work from scoping and design through implementation, testing, deployment, and optimisation.

• Maintain a high-performance platform with strong uptime and speed, tuning high-throughput services (concurrency, rate limiting, back-pressure, circuit breaking).

• Lift engineering quality through design discussions, code reviews, and modern tools and patterns.

• Improve reliability, security, and developer workflows with better CI/CD, test automation, and tooling.

• Partner with Product, Design, and BI to deliver business-critical features for users across Africa.

• Design and build USSD menus, applications, and short-code flows for Rwanda, handling timeouts, languages, and device differences.

• Integrate with Rwandan MNOs (e.g., MTN Rwanda, Airtel Rwanda) for USSD, charging, and Mobile Money, and build charging engines (real-time charging, balance checks, refunds, retries, idempotency).

• Create secure, low-latency APIs and adapters for USSD gateways, charging platforms, and wallet providers, ensuring compliance with RURA, privacy, KYC/AML, and operator rules.

OUR REQUIREMENTS

• 6+ years of advanced C#/.NET development experience (strong in .NET Core).

• Recent, proven experience delivering USSD services and/or telco charging integrations in Rwanda (must-have).

• Strong SQL skills (schema design, complex queries, stored procedures).

• Solid knowledge of service architecture: stateless services, caching, messaging, RESTful APIs.

• Hands-on experience with Docker and CI/CD; comfortable with automated testing.

• Production experience on a public cloud (AWS preferred).

• Experience with Redis or a similar NoSQL store.

• Strong performance diagnostics and tuning skills (profiling, memory/CPU, DB and cache).

• Proactive, results-driven, and a clear communicator in English.

NICE TO HAVE:

• Experience with Mobile Money integrations, SMPP/SMS gateways, OAuth2/OpenID Connect.

• Familiarity with observability tooling (Prometheus, Grafana, OpenTelemetry) and resiliency patterns.

• Knowledge of other African markets and telco integration specifics.

WHAT WE OFFER:

• Competitive salary and benefits package.

• Opportunity to work in a dynamic and growing industry.

• Career growth opportunities within the Dev team.

• Exposure to a global team and innovative technologies.