Senior Backend Engineer (NodeJS/Golang/Python)

Job description

1. CDN Optimization & Routing

• Build dynamic routing services across in-house & third-party CDNs (BytePlus, Gcore, etc.) based on real-time conditions (ISP, bandwidth, cost, QoS).
• Implement feedback loops using QoE metrics for automatic CDN selection.

2. Experimentation & Config Platform

• Develop APIs/services for real-time A/B testing, feature flagging, and config-based behavior without redeployments.
• Collaborate with data engineers to design pipelines and stores for variant analysis.

3. Engagement Platform

• Design backend systems for omnichannel messaging (push, in-app, email) using real-time user segmentation.
• Integrate with messaging providers and build routing/logging systems for reliability.

4. Transcoding System Integration

• Build control panels for configuring backend services, transcoding profiles, and routing rules.
• Ensure role-based access, audit logging, and fail-safe designs.

5. Core Engineering Practices

• Design clean APIs, asynchronous workers, and scalable microservices with observability (metrics/logs/traces).
• Write automated tests (unit/integration/load), CI pipelines, and infrastructure-as-code when required.

Your skills and experience

• Bachelor’s degree or higher in IT, Software Engineering, Computer Science, or related field.
• At least 4 years of experience as a Backend Engineer
• Hands-on experience building products serving millions of users
• Experience deploying and developing services on cloud platforms (GCP, AWS, etc.)
• Experience in media processing/CDN routing is a plus
• Strong understanding of programming fundamentals: common algorithms, data structures, etc.
• Proficient in microservices, event-driven architecture, and real-time messaging
• Skilled in building and optimizing API performance
• Languages: Golang, Node.js, Python
• Infrastructure: Kubernetes, Docker, Redis, Kafka
• Databases: Postgres, MongoDB, MySQL
• Cloud/CDN: GCP, AWS
• Tooling: GitHub Actions, Prometheus, Grafana
• Ability to work under pressure, independently and in a team; capable of explaining technical concepts clearly and simply.

Why you'll love working here

• Insurance based on 100% of Gross salary.
• Working hours: Monday to Friday, 8:30 AM – 5:30 PM (1-hour lunch break).
• 14 annual leave days.
• Provided with working equipment (Macbook).
• Parking area available.
• Year-end PMP bonus (depending on company performance & individual KPIs).
• Annual health check-up.
• Internal activities and employee engagement programs.