Senior Systems Developers (m/f/d)

Lisboa, Portugal

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Knower™ Tech is a brand belonging to the Wellow™ Group that aims to match qualified professionals with the market.

Essential Duties and Responsibilities:
• Work with our networks, implementation and architecture teams, along with other key 
stakeholders to design and implement new features
• Help our infrastructure teams build and maintain high availability infrastructure to 
support the team's software
• Provide solid technical understanding of our codebase - working alongside skilled peers
• Reduce our existing system’s complexity and be willing to tackle application legacy
• Build and maintain our network automation system and surrounding services
• Work with network device APIs and user interfaces
• Understand and improve our network data model
• Improve application efficiency and performance
• Participate in code reviews
• Contribute to improve and develop standards and best practice
• Participate in an on-call rotation for our software
• Act as escalation point for junior members of the team



Escolaridade mínima: Licenciatura Bolonha (3 anos)/ Bacharelato Completo

• Strong knowledge of one of the following languages: Java or C++ or Perl
• Good knowledge of Python (a plus, not a requirement)
• Ability to learn new programming languages and technologies as necessary
• Ability to produce reliable and well tested code
• Knowledgeable with SQL databases
• Strong systems and software engineering skills
• Good knowledge of computer networking technologies (TCP, IPv4/IPv6, HTTP, DNS, etc..)
• In-depth knowledge of Linux and experience with virtualisation and containerisation 
• Version control, CI/CD pipelines
• Excellent troubleshooting and debugging skills
• Attention to detail
• Ability to share knowledge and ideas as well as listening to other’s opinions
• Be fluent in English with good written and verbal communication skills

• Experience with Service Provider networking (IS-IS, BGP, MPLS)
• Experience with Data Centre networking (L2, VXLAN)
• Experience working with distributed modern infrastructure (Docker / Kubernetes)
• Experience with Google Web Toolkit (GWT)
• Ability to mentor the junior developers in our team


What we offer:

  • Salary package and contract compatible with experience and ambitions
  • Benefits (day off on birthday, health insurance, extra vacation days, admission kit, various get-togethers, etc.)
  • Training plan and continuous learning environment
  • Skills development opportunities
  • Excellent work environment




We believe that talent overcomes age, gender identity, ethnicity, political or religious orientations, it overcomes barriers of expression, educational levels and physical limits. Our commitment is to the merit of those who seek to be a better version of themselves every day! For this reason, we seek to ensure that our recruitment and selection process is inclusive and respects the individuality of each person, creating a healthy and happy experience for those who come across us. Learn more about our commitment at!