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Senior Backend Engineer (Research & Development) (m/f/d)

Job ID
516613
Posted since
04-Aug-2026
Organization
Smart Infrastructure
Field of work
Research & Development
Company
Siemens S.A.
Experience level
Experienced Professional
Job type
Full-time
Work mode
Hybrid (Remote/Office)
Employment type
Permanent
Location(s)
  • Amadora - Lisboa - Portugal
Create a better #TomorrowWithUs 🚀

At Siemens, we build technology solutions to shape the world we live in. We transform industries and societies by combining the real and digital worlds. With over 300.000 of the world’s most forward-thinking minds and the power of a presence in more than 190 countries, we make a truly global impact.

Siemens Smart Infrastructure relies on the combination of smart grids and smart buildings by combining physical solutions and digitalization in all areas of electrification and automation. Ingeniously it connects energy systems, buildings, and industries to improve the way we live and work through greater efficiency and sustainability.
Siemens SI has its global headquarters in Switzerland with about 7,400 colleagues who are responsible for the solutions and services business. This makes Siemens SI the market leader in Europe.

Are you ready to be part of the change? Come join us!⭐


Your mission will be…  
  • Design, develop, and maintain AWS-based web applications and microservices using  C# and Golang
  • Ensuring code quality, reusability, modularity, maintainability and security
  • Improving performance and scalability of developed software
  • Participation in requirements elicitation, communication with end customers
  • Improving development processes, including refactoring activities
  • Conduction of code reviews
  • Development and clarification of a system and functional requirements
  • Communicate with the representatives of the end customers and with other platform architects developed by the company


We are looking for someone with…
  • 7+ years of experience in industrial/commercial software development
  • Strong object-oriented programming skills
  • Practical experience with AI-native software engineering (e.g., LLM integration, RAG architectures, prompt engineering, or using vector databases)
  • Experience in designing and optimizing database schemas to support application requirements
  • Proficiency in the С# ecosystem. Solid experience with Golang
  • Experience with relational databases such as PostgreSQL, and cloud database services such as Amazon RDS
  • Proficiency in writing complex SQL queries and procedures
  • Experience with horizontal and vertical scaling technologies for data. Knowledge of methods to optimize database performance with large datasets. 
  • Experience with NoSQL databases such as DynamoDB, MongoDB, Cassandra
  • Experience with RESTful API, WebSockets
  • Experience with spec-first code generation (openapi, protobuf) 
  • Experience with AWS cloud services
  • Knowledge of basic DevOps tools and practices (CI/CD, IaC, Docker, k8s, monitoring & logging tools, automated testing and deployment strategies)
  • Strong Linux user skills
  • Communication skills and readiness to work in a team as well as individually
  • Upper intermediate English proficiency 

Nice to have skills: 
  • Working knowledge of Golang 
  • Experience with semantic web technologies and graph APIs (SPARQL, GraphQL)
  • Understanding of energy and sustainability domain concepts
  • Experience with SOAP APIs
  • Knowledge and experience with data modeling tools such as Enterprise Architect, Erwin, PowerDesigner


What We Offer
  • Belong & Innovate: Work in diverse teams where every idea matters and innovation grows through collaboration and trust.
  • Flexibility that Works: Hybrid model, flexible hours, and a home office budget — because balance fuels performance.
  • Health & Well-being: Comprehensive health insurance, mental health support, and active sports communities to keep you feeling your best.
  • Grow Without Limits: Access world-class learning platforms, mentoring, and continuous development opportunities.
  • Purpose & Perks: Contribute to sustainability and volunteer initiatives, enjoy partner discounts, and take advantage of our convenient shuttle service.

Please attach your CV in English to your application.

#Siemens
 
Siemens is deeply committed to fostering a diverse and inclusive environment. We are proud to be an equal opportunity employer and strongly encourage applications from a wide array of talented individuals!