Senior .NET Developer

In Goelett, we are an extraordinary mix of travel industry experts, product, and software engineers, developing a successful online booking tool for corporations and large organizations. Today, as a part of the sector leader S4BT Group, we support 500k+ business users making thousands of bookings a day.

We are seeking a Senior.Net Developer (Back-end) who is keen on working within a product development team, has a background in system and integration analysis, and is ready to take on a dynamic career opportunity by driving requirements analysis, resolving system issues, and enhancing product functionalities!

Work model: hybrid (3 days in the office + 2 days remote / weekly) – office located in Warsaw, PL.

What you will be doing:

• Develop clean, scalable code using . C# / .Net in Micro-service Architecture & Cloud-native.


• Test and deploy system and apps on Azure.


• Monitor and optimize system performance, addressing any issues as they arise.


• Serve as an expert on the system and provide technical support to other Internal teams.


• Work in an agile squad with strong attention to user experience, quality assurance and continuous integration.


• Build engineering practice by learning, sharing knowledge applying best practices.


• Work on projects which directly impact the company’s growth.

What we're looking for:

• 5+ years of professional experience in software development using C#, modern cloud architectures, and related technologies.

• Strong understanding of core software engineering principles and API design.


• Proven expertise in implementing and managing high-performance, containerized applications at scale on Microsoft Azure.


• Proficiency in designing and managing databases using SQL and NoSQL technologies.


• In-depth knowledge of microservices, clean code, clean architecture, and SOLID principles.

• Working knowledge of Angular/AngularJS is a plus.

• Familiarity with AI tools to enhance development processes is an advantage.


• Familiarity with Agile/Scrum methodologies and collaborative development practices.


• Professional proficiency in English.


• Experience in Rail development solutions is nice to have.

What we offer:

• A truly global perspective – develop your international mindset by collaborating daily with colleagues from diverse cultures and backgrounds across the world.


• Real impact – contribute to shaping the future of one of the most user-centric companies in the travel-tech industry. Your ideas and solutions will reach thousands of users globally.


• Medical care – because your well-being matters.


• Multisport card – keep your body as active as your mind.

• Extra days off – celebrate your day with a paid day off for your birthday, and another to give back through volunteering.


• Language courses – grow your communication skills and connect effortlessly in our multicultural environment.


• Team integrations & fun events.


• Lunch vouchers – enjoy your breaks with tasty meals on us.