Lead Backend Engineer (Node.js/Golang/AWS) with German

Unravel; Polska; Hybrid; PLN 207,000 - 303,000; Full time

Job summary

Unravel is seeking a Lead Backend Engineer (Node.js/Golang/AWS) who will own the backend of an advanced platform. You will design scalable services, lead a team of developers, and collaborate directly with German-speaking clients to translate needs into robust technical solutions.

The role requires strong Node.js experience, cloud expertise (AWS), and fluency in German, with engagement in agile ceremonies and continuous improvement.

Qualifications

• 5+ years of professional backend development at a Senior Software Engineer level
• Strong commercial experience with Node.js
• Fluent German (C1/C2) mandatory with stakeholders
• Very good command of English
• Experience working directly with clients
• Experience designing and developing scalable backend services and microservices
• Experience with AWS services and cloud 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
• Strong communication and problem-solving skills

Responsibilities

• Design, develop, and maintain scalable backend services using Node.js as primary stack
• Develop microservices with Golang and Python
• Collaborate with German-speaking clients to gather requirements and propose solutions
• Lead a development team of up to 10 members
• Build and optimize PostgreSQL data models and queries
• Develop and maintain APIs with gRPC and REST
• Containerize apps with Docker and deploy on Kubernetes (AWS)
• Contribute to architecture decisions for distributed systems
• Ensure 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 initiatives

Skills

Node.js

Python

Redis

gRPC & REST APIs

AWS

RabbitMQ / AWS SQS

NestJS

Tools

Docker

Kubernetes

PostgreSQL

Job description

Lead Backend Engineer (Node.js/Golang/AWS) with German

• Node.js
• Python (ETL-related components)
• Redis (Key-Value stores)
• gRPC & REST APIs
• AWS (cloud infrastructure)
• RabbitMQ / AWS SQS (event-driven architecture)
• NestJS

Required 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, solution discussions, and ongoing collaboration
• Experience designing and developing scalable backend services and microservices
• Experience with AWS services and cloud-based environments
• Solid knowledge of PostgreSQL and database design for scalable, high-performance 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

Nice to Have:

• Experience with frontend technologies such as Angular, Svelte, and TypeScript is a plus
• Experienced in using AI tools in day-to-day workflow
• Knowledge of the energy or electric energy industry domain
• Experience working within highly agile environments

Project Description:

You will join the development of an advanced digital twin platform for the energy transition, designed to unify energy and climate-related data into a single, comprehensive solution.

The platform supports stakeholders involved in energy transformation by providing data-driven insights and decision-making tools. It addresses key challenges such as CO2 balancing, renewable energy expansion, power grid planning, and municipal heating strategies.

Built on a modular and scalable architecture, the solution enables complex analytics and supports real-time insights in a rapidly evolving energy sector.

Scope of Services:

• Design, develop, and maintain scalable backend services using Node.js as the primary technology stack
• Contribute to the development of microservices built with Golang and Python
• Collaborate directly with German-speaking clients and stakeholders to understand requirements and propose technical solutions
• Leading 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 initiatives

Salary 150 - 220 PLN hourly