Senior Backend Engineer (Golang/Python/NodeJS)

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.
• 4+ years of backend engineering experience, preferably in platform, infrastructure, or media-heavy domains.
• Languages: Strong algorithmic thinking & problem-solving are more important than specific languages. Knowing Golang is a plus; experience with Python or Node.js is also valuable.
• Frameworks: gRPC, REST, FastAPI, Express
• Infra: Kubernetes, Docker, Redis, Kafka, Postgres, MongoDB
• Cloud/CDN: GCP, BytePlus, Gcore, Cloudflare, in-house CDN
• Tooling: GitHub Actions, Prometheus, Grafana, Datadog, Airflow
• Strong knowledge of distributed systems, microservices, event-driven architecture.
• Experience with real-time data processing and dynamic API-driven systems.
• Familiarity with CDN technologies, transcoding pipelines, or experimentation platforms is a plus.
• Collaborative mindset, comfortable working with product managers, frontend engineers, and QA.
• Strong problem-solving, communication, and analytical skills.

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 (Laptop/PC).
• Parking area available.
• Year-end PMP bonus (depending on company performance & individual KPIs).
• Annual health check-up.
• Internal activities and employee engagement programs.