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April 8, 2026

Senior Full-Stack Developer (with Optimizely)

Senior • Remote

150 - 210 PLN/hr

Warsaw, Poland

We are looking for an experienced Senior Full-Stack Developer (with Optimizely) to join the team of our client. The project focuses on building a modern e-commerce and marketing platform based on composable, headless, cloud architecture, with the goal of delivering a seamless and fully personalized end-to-end customer experience.

Who we are:

We are Inspeerity (part of DevelopX group), a modern software house, providing software development, consultancy, and maintenance services. We specialize in full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people.

TL;DR

Who: Senior Full-Stack Developer (with Optimizely)

Contract Type: B2B

Salary range: Up to 210 PLN/h + VAT

Start date: ASAP

Project lenght: ~12 months, with the possibility of extension.

Company: Software House

Project topic: Building Materials Industry

What you’ll be doing:

  • Developing scalable technical solutions.

  • Building and maintaining automated build and deployment pipelines.

  • Developing features across the full technology stack, from data access and business logic to the user interface.

  • Writing unit tests, fixing bugs, and preparing documentation.

  • Troubleshooting and resolving production issues.

  • Collaborating closely with business stakeholders to translate requirements into effective technical solutions.

You will be the best fit if you have:

  • At least 4 years of practical experience working with Microsoft .NET / ASP. NET Core and SQL Server.

  • Strong understanding of software architecture, design patterns, and engineering best practices.

  • Hands-on experience in full-stack development using C# and web technologies.

  • Solid knowledge of web application performance, quality standards, and security principles.

  • Genuine interest in Generative AI and its application in optimizing and automating the software development lifecycle.

  • Experience working in Agile environments, including CI/CD pipelines, TDD, and peer code reviews.

  • In addition to the stack mentioned above, experience in working with Apache Kafka, Webpack, TailwindCSS, Storybook, Chromatic, Rider, Visual Studio, Git, Github, Gitflow.

  • Experience with React is a plus.

  • English level B2 or higher.

What we offer

  • Remote work model with occasional visits to our client's office in Poznań or Warsaw.

  • B2B contract.

  • You’ll join a collaborative team of 12 specialists.

About process:

  • Step 1 - Call with with someone from our People Team.

  • Step 2 - Meeting with our .NET Team Lead as a technical interviewer.

  • Step 3 - Final stage. A technical interview with the client-side representatives.

Time for your turn! ;)