Job Openings Senior backend engineer

About the job Senior backend engineer

Role: Senior backend engineer
Job Ref Id: JD-1262
Competence level: 5+ years
Start date: 2026-11-02
End date: 2027-04-30
Extension option: Yes
Scope: 100%
Location: Stockholm
Remote work: On-site
Language: English
Application deadline: 2026-10-25
Number of consultants: 1
Security clearance: No

 

About the assignment

We are looking for an experienced backend engineer with expertise in Node.js and MongoDB to work on one of our core products.

 

Responsibilities

  • Develop and maintain Node.js applications
  • Deploy and release new capabilities, features and fixes
  • Ensure quality standards, including test automation, manage tech debt, etc.
  • Collaborate with product managers to define the product roadmap
  • Write and maintain tech documents, including RFCs, ADRs, postmortems, etc.
  • Own tech roadmap and priorities aligning with product priorities
  • Ensure observability and monitoring match industry standards
  • Proactively address security issues in collaboration with our security department
  • Join and actively contribute to team ceremonies
  • Propose improvements in our SDLC
  • Proactively identify cost saving opportunities

 

Requirements

Mandatory

  • Solid experience with TypeScript/JavaScript/Node.js and MongoDB (Mongoose ODM)

  • Experience with real-time/streaming systems design (e.g. WebSockets, low-latency audio pipelines, etc.)

  • Hands-on experience with Redis / ioredis (caching, rate limiting, pub/sub)

  • Experience with event-driven applications and messaging systems

  • Solid experience with microservices architecture and async programming

  • Experience with observability/metrics tooling (e.g. Prometheus, structured logging)

Nice-to-have

  • Experience with BullMQ and Node's Cluster module, working with workers and subprocesses

  • Experience with LLMs and audio processing (STT/TTS)

  • Experience with Keystone and Express.js

  • Experience with gRPC and Protocol Buffers

  • Experience with NATS (messaging queue)

  • Experience with Docker and Docker Compose

  • Experience with Kubernetes + ArgoCD + Kustomize (multi-region GKE deployments)

  • Experience with Go and WebSocket bridging services

  • Experience with cloud/VoIP telephony and telecom generally

  • Experience with Kamailio / Homer

  • Experience with Asterisk PBX / ARI (Asterisk REST Interface) and SIP/IAX protocols

  • Experience with Firebase Admin / APNs


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