Software Engineer 2 (.NET/C#) - OneBox Backservices

• Impact at Scale: We are part of Allegro, developing high-performance IT systems for OneBox backend.
• Massive Scale: Design and build high-availability systems used by tens of thousands of users. This is high-performance engineering in practice.
• Modern Tech Stack: Work with a world-class environment using C#, .NET Core, ASP.NET, REST, PostgreSQL, Azure, Docker, Kubernetes, EntityFramework, and Redis.
• True Ownership & Autonomy: We live by a "you build it, you run it" philosophy. You'll join an autonomous team with full ownership of the services you create, from design to deployment.
• Complex Challenges: You will tackle complex backend problems, using technology to solve real-world business challenges.

Join the team building the backend powering our OneBox network! Imagine walking down the street, spotting a OneBox parcel locker, and knowing that your code helps drive it – that's the kind of impactful project you'll be working on. Our systems process millions of parcels, operating at high scale, high complexity, and deep integration close to the hardware.

In this role, you will work with physical machines, shape our backend architecture, and scale our infrastructure to support a continuously growing fleet of OneBoxes. We prioritize high reliability, modern engineering practices, and a supportive team culture, offering you a unique opportunity to solve complex real-world challenges at scale.

• Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work.
• The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost):
• PLN 14 600 - 20 825
• Annual bonus based on your annual performance and company results.
• Our team is based in Warsaw.

What's in it for you:

• Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms).
• A 16" or 14" Dell with Windows and all the necessary accessories.
• A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers).
• English classes that we pay for related to the specific nature of your job.
• A training budget, inter-team tourism (see more here), hackathons, and an internal learning platform where you will find multiple trainings. 
• An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. 
• Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy.

And that's just the beginning! You can read more about the benefits here.

We are looking for people who have:

• Core Backend & Architecture: Solid proficiency in C# and .NET Core / ASP.NET for building reliable, maintainable backend systems; practical experience in building and consuming REST APIs according to industry standards; comfortable participating in architectural discussions and contributing to overall system design.
• Data & Distributed Systems: Practical experience with relational databases like PostgreSQL, including data modeling and basic performance tuning; hands-on work with asynchronous messaging systems (Azure Service Bus or similar message brokers); understanding of caching concepts and tools like Redis to support system performance.
• Cloud & IoT Infrastructure: Hands-on experience with cloud-native tooling such as Docker and Kubernetes; experience with - or open, excited, and aware of working with - large IoT device networks and ecosystems (a plus).
• Delivery, Culture & Languages: Enjoy sharing knowledge and encouraging good engineering practices; eager to grow toward end-to-end task ownership across the software development lifecycle with mentorship from senior engineers; proficient in Polish and English (at least B2 level).