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

Project overview

Tech Stack:

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.

• Node.js
• Golang (microservices, gRPC-based services)
• Python (ETL-related components)
• PostgreSQL
• Redis (Key-Value stores)
• gRPC & REST APIs
• Docker & Kubernetes
• AWS (cloud infrastructure)
• RabbitMQ / AWS SQS (event-driven architecture)
• NestJS
• 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

Requirements

• 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 details

• Start: ASAP
• Location: Remote, Wrocław, Germany, DE, Brussels, PL
• Rate: 150-220 EUR/h