Senior Backend Software Engineer

1 week ago


Thessaloniki, Central Macedonia, Greece Onelity Full time €35,000 - €60,000 per year

Your mission:

As a Senior Backend Software Engineer, you'll design and deliver the core services of a new platform, being part of a greenfield project. Your backend expertise will ensure performance, scalability, and reliability at every layer.

In this role, you will:

  • Build APIs and microservices using and Fastify
  • Work with PostgreSQL (via Prisma ORM), caching (Redis), and messaging (RabbitMQ)
  • Design scalable, distributed systems with a focus on performance
  • Write and maintain tests with Jest to ensure reliability
  • Collaborate with frontend, DevOps, and QA teams in an agile setup
  • Contribute to architectural decisions and technical direction

This role is perfect for you if you have
:

  • 5+ years of relevant working experience as a software engineer
  • Academic background (Degree in Computer Science, Business Informatics, or a related IT field)
  • Strong proficiency in and backend frameworks
  • Experience with relational databases and ORMs (PostgreSQL, Prisma)
  • Knowledge of distributed systems and caching (Redis)
  • Experience with message brokers (RabbitMQ)
  • Strong foundation in OOP and design patterns
  • Hands-on experience with API and microservices development
  • AWS, Docker, Kubernetes experience is a plus

Reasons to join us:

  • Be a key contributor to a greenfield platform with no legacy tech
  • Use modern backend technologies and cloud-native practices
  • Join a skilled and supportive team in Thessaloniki
  • Enjoy flexibility, flat hierarchies, and open communication


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