Senior .NET Back-End Developer

As Polish outsourcing company with Scandinavian roots, we particularly appraise values such as Scandinavian , this all comes in a Scandinavian work culture. energy, logic and experience.

Our philosophy is not just a word - it is a way of thinking. We take care of your needs, adapt solutions and take appropriate care of everything. "CARE"

B3 Consulting Poland is not just a workplace, it is a community of enthusiastic people 🙌🙌 If you want to be part of our crew, we invite you on a journey to a galaxy far, far away 🚀

We are currently looking for Senior .NET Back-End Developer

who will join the project and and help develop scalable back-end cloud services (AWS)

Role focus areas:

• Designing and developing high‑performance back-end services in .NET (C#) in an AWS cloud environment, with a strong focus on scalability, reliability, and performance.
• Building and maintaining solutions based on AWS (including cloud services and NoSQL databases such as DynamoDB) and integrating the back end with other systems and interfaces.
• Collaborating with Front-End, QA, and business stakeholders: taking part in architectural decisions, code reviews, sprint planning, and supporting less experienced engineers.

What you need to join us:

Must have:

• At least 5 years of commercial experience in back-end development with .NET (C#) at Senior level, covering the full software development lifecycle.
• Hands-on experience with AWS in production environments, including cloud services and NoSQL databases (e.g. DynamoDB).
• Strong back-end engineering fundamentals: API design, integrations, performance, maintainability, and solid system architecture.
• Experience with Git and modern code review workflows, as well as working in an Agile environment (Scrum/Kanban).
• Very good communication and teamwork skills, availability to work with a Poland-based team (PL/EU working hours), and a degree in Computer Science or a related field (or equivalent experience).
• English - B2/C1
• You need to live in Poland and/or be eligible to work here

Nice to have:

• Knowledge of TypeScript/JavaScript (e.g. when collaborating with Front-End or in tooling/testing support).
• Familiarity with testing tools such as Playwright or Selenium and an understanding of QA methodologies and release processes.
• Experience or education in Electrical Engineering or a related technical field.
• A mentoring mindset: enjoys sharing knowledge, coaching others, and reinforcing good practices through code reviews, pairing, and pragmatic guidance.

On board with B3 you will receive:

• Health and sports benefits tailored to your needs
• Free running and swimming training, internal triathlon team, joint competitions (Warsaw)
• Tailor-made development activities to deepen expert knowledge
• Cyclical initiatives allowing development in IT fields other than the current one