Tech Lead Fullstack with .NET and Angular (f/m/x)

Senior • Remote

Bialystok, PD, Poland

We are looking for an experienced Tech Lead to join a European team working on a custom-built solution for the industrial/manufacturing sector. The application supports an end-to-end process—from logistics, through production, to final shipment—ensuring full traceability and process control. This role is strongly backend- and cloud-focused and requires a pragmatic, delivery-oriented mindset.

Your tasks

Design, develop, and maintain backend-centric fullstack solutions using .NET and Angular
Take ownership of technical decisions with a strong focus on backend architecture and cloud-based solutions
Build and evolve systems based on Domain Driven Design and Clean Architecture
Design, develop, and maintain microservices, APIs, and integration layers
Ensure code quality through unit tests and architectural consistency
Plan and realistically deliver roadmap items, focusing on feasibility, prioritization, and execution

Requirements

Minimum 7 years of commercial experience in .NET development, including senior or tech lead responsibilities
Strong backend expertise combined with hands-on experience as a Fullstack Developer (Angular)
Solid understanding of cloud-native architectures and modern backend systems
Solid understanding of Domain Driven Design, Clean Architecture, microservices, and API design
Practical experience using AI tools in daily development work (e.g., AI copilots, AI-assisted coding, AI-driven workflows)
Pragmatic, realistic engineering mindset focused on delivery, planning, and rational decision-making
Ability to take ownership of complex topics and drive them to completion
Fluency in English
Residing in Poland required

Sii

Sii is a company recognized as a "Great Place to Work" since 2015, thanks to employee feedback and the implementation of new ideas. Established in 2006, Sii has demonstrated financial stability with a revenue of 2.1 billion PLN and no debts. The company shares its profits with employees, having allocated over 76 million PLN for this purpose since 2022. Sii offers a rich benefits package, including private healthcare, a cafeteria platform, and discounts on cars. Employees can work in comfortable A-class offices or remotely. Sii is involved in numerous fascinating projects for prestigious global brands and invests 1 million PLN annually to support employee passions and volunteer actions. The company emphasizes personal development through meetups, webinars, a training platform, and a technology blog. Sii is characterized by a fantastic atmosphere created by its "Sii Power People."

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