Mahmood Yousef
Senior Software Engineer
Summary
Senior backend engineer with 5 years of experience building and maintaining large-scale production systems. Specialized in databases, infrastructure, and reliability. At Maqsam, I lead the team responsible for the core VoIP product — designing systems for high availability, horizontal scalability, and zero-downtime deployments. I care deeply about observability, cost efficiency, and building things that don't break in production.
Experience
Technical Lead — Maqsam
Jul 2023 — Present · Amman, Jordan
- Led the team responsible for the main VoIP product, maintaining Rails, Node.js, Redis, and PostgreSQL infrastructure on AWS.
- Designed and implemented a critical production traffic handling system with horizontal scalability.
- Custom-built stateful load balancing for WebRTC and SIP, enabling infinite scaling with high availability.
- Increased customer satisfaction from 83% to 97% by revamping observability with Quickwit and Prometheus, adding automated end-to-end testing with CI/CD.
- Optimized server-to-client WebSocket communication for improved message delivery speed and reliability.
- Rebuilt the company's interviewing process across all seniority levels.
Software Engineer — Maqsam
Aug 2021 — Jul 2023 · Amman, Jordan
- Cut company costs by over 40% by co-leading a team to build a multi-threaded, event-driven programmable voice service (similar to Twilio) using Node.js, PostgreSQL, and Redis.
- Transitioned the billing system from post-payment to pre-payment with a resilient migration strategy, fault-tolerant architecture, and data consistency guarantees.
- Reduced intermittent disconnections by 15% by overhauling the presence model using Redis, overcoming browser throttling.
- Built an internal tool that reduced support ticket resolution time by 30% and lowered engineering workload by 40%.
Skills
Languages & Frameworks
Ruby on RailsNode.jsGoPythonJavaTypeScript
Databases & Messaging
PostgreSQLRedisElasticsearchMongoDBDynamoDBRabbitMQgRPC
Infrastructure
AWS (EC2/S3/RDS)DockerKubernetesPrometheusGrafanaAnsible
Education
B.Sc. in Computer Engineering
2016 — 2021 · German University in Cairo, EgyptCoursework: Computer Architecture, Comparison of Learning Algorithms, Computational Theory