Backend .NET Engineer - USSD & Telco Charging at B2Tech

, , Rwanda -

Full Time

Start Date

Immediate

Expiry Date

09 Apr, 26

Salary

0.0

Posted On

09 Jan, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

C#, .NET, USSD Services, Telco Charging, SQL, Service Architecture, Docker, CI/CD, Automated Testing, Public Cloud, Redis, Performance Diagnostics, Communication, Mobile Money, SMPP, Observability Tooling

Industry

Entertainment

Description

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.

Responsibilities

Design and build backend services at scale, owning work from scoping and design through implementation, testing, deployment, and optimization. Integrate with Rwandan MNOs for USSD, charging, and Mobile Money, ensuring compliance with local regulations.