Backend .NET Engineer (USSD & Telco Charging)

TL;DR

Backend .NET Engineer (USSD & Telco Charging): Designing and building large-scale backend services for telco charging and USSD applications across Africa with an accent on high-throughput services and MNO integrations. Focus on implementing real-time charging engines, optimizing system reliability, and ensuring compliance with Rwandan regulatory standards.

Location: On-site in Rwanda

Company

hirify.global is a leading omnichannel technology solutions provider to the Sportsbook & iGaming industry with a strong presence and focus on emerging markets.

What you will do

• Design and implement scalable backend services from scoping through deployment and optimization.
• Tune high-throughput services focusing on concurrency, rate limiting, and circuit breaking to ensure high uptime.
• Develop USSD menus, short-code flows, and integrate with Rwandan MNOs like MTN and Airtel.
• Build charging engines for real-time balance checks, refunds, and idempotency.
• Create secure, low-latency APIs and adapters for USSD gateways and wallet providers.
• Improve engineering quality through code reviews, CI/CD, and automated testing.

Requirements

• 6+ years of advanced C#/.NET Core development experience.
• Proven experience delivering USSD services and/or telco charging integrations in Rwanda (must-have).
• Strong SQL skills for schema design and complex stored procedures.
• Hands-on experience with Docker, CI/CD, and public cloud (AWS preferred).
• Experience with Redis or similar NoSQL stores.
• Must be able to work on-site in Rwanda.

Nice to have

• Experience with Mobile Money integrations, SMPP/SMS gateways, or OAuth2/OpenID Connect.
• Familiarity with observability tooling such as Prometheus, Grafana, and OpenTelemetry.
• Knowledge of other African markets and telco integration specifics.

Culture & Benefits

• Opportunity to build high-impact products for emerging African markets.
• Collaboration with cross-functional Product, Design, and BI teams.
• Focus on modern engineering patterns and continuous quality improvement.
• Work environment within a leading iGaming technology provider.