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Open nowFirst seen 45 hours ago

Senior backend engineer

Aqilea51 open roles

Where
Stockholm, Sweden
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Your applicationOpen nowSenior backend engineerAqilea · Stockholm, Sweden

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Share of postings closed within
  1. 2.1%1 day
  2. 4.4%3 days
  3. 11.8%7 days
  4. 18.6%14 days
  5. 35.6%30 days
  6. 45.1%60 days
This job: first seen 45 hours ago

The posting

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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