Senior backend engineer

Aqilea; Stockholms kommun; Presencial; SEK 900.000 - 1.170.000; Jornada completa

Descripción de la vacante

Aqilea is seeking an experienced Senior Backend Engineer to contribute to a core product stack built with Node.js and MongoDB. The role focuses on building scalable backend services in a highly collaborative environment.

You will own parts of the tech roadmap, drive feature development, and ensure robust observability and security practices across deployments. This position is on-site in Stockholm, with English as the working language.

Formación

• 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)

Responsabilidades

• 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

Conocimientos

Node.js

MongoDB

TypeScript

JavaScript

WebSockets

Redis

Microservices

Observability tooling

Herramientas

Docker

Docker Compose

Kubernetes

Express.js

gRPC

Protocol Buffers

NATS

BullMQ

ArgoCD

Kustomize

Descripción del empleo

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.

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