Senior Backend Architect - Node.js, Go, AWS

Unravel; Wrocław; On-site; PLN 180,000 - 280,000; Full time

Job summary

Unravel is building an advanced digital twin platform for energy transition, unifying energy and climate data into a single comprehensive solution. You will design and implement scalable backend services in Node.js and contribute to microservices with Golang and Python, collaborating with German-speaking stakeholders to deliver robust data-driven insights.

You will lead a development team of up to 10 and help shape the architecture of distributed systems, including PostgreSQL data models and

Qualifications

• 5+ years of professional experience in backend development at a Senior Software Engineer level.
• Strong commercial experience with Node.js.
• Fluent German (C1/C2) – mandatory, with the ability to communicate confidently with business stakeholders and clients.
• Very good command of English.
• Experience working directly with clients, including requirements gathering and solution discussions.
• Experience designing scalable backend services and microservices.
• Experience with AWS services and cloud-based environments.
• Solid knowledge of PostgreSQL and database design for scalable systems.
• Good understanding of Docker and Kubernetes.
• Experience designing and developing REST and/or gRPC APIs.
• Ability to work independently, take ownership, and drive solutions from concept to delivery.
• Strong communication and problem-solving skills.

Responsibilities

• Design, develop, and maintain scalable backend services using Node.js as the primary stack.
• Contribute to microservices built with Golang and Python.
• Collaborate with German-speaking clients to understand requirements and propose technical solutions.
• Lead a development team of up to 10 members.
• Build and optimize PostgreSQL data models and queries.
• Develop and maintain APIs using gRPC and REST.
• Containerize applications with Docker and manage deployments on Kubernetes (AWS).
• Contribute to architecture decisions for distributed systems.
• Ensure system scalability, performance, and reliability.
• Collaborate with frontend (Angular) and backend (NestJS) teams.
• Work independently from concept to production delivery.
• Participate in agile ceremonies, code reviews, and continuous improvement.

Tools

Node.js

AWS

PostgreSQL

Docker

Kubernetes

gRPC

REST APIs

NestJS

Golang

Python

RabbitMQ

AWS SQS

Angular

TypeScript

Job description

Unravel is building an advanced digital twin platform for energy transition, unifying energy and climate data into a single comprehensive solution. You will design and implement scalable backend services in Node.js and contribute to microservices with Golang and Python, collaborating with German-speaking stakeholders to deliver robust data-driven insights.

You will lead a development team of up to 10 and help shape the architecture of distributed systems, including PostgreSQL data models and