Senior Backend Engineer: Node.js & MongoDB Lead (Stockholm)

Aqilea; Stockholms kommun; On-site; SEK 900,000 - 1,170,000; Full time

Job summary

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.

Qualifications

• 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)

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

Skills

Node.js

MongoDB

TypeScript

JavaScript

WebSockets

Redis

Microservices

Observability tooling

Tools

Docker

Docker Compose

Kubernetes

Express.js

gRPC

Protocol Buffers

NATS

BullMQ

ArgoCD

Kustomize

Job description

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.