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Senior Developer (E-commerce Marketplace)


Job Location:

Warsaw - Poland

Monthly Salary: Not provided by the employer
Posted: 19 August 2026 (9 hours ago)
Application Deadline: 16 November 2026
Vacancies: 1 Vacancy

Job Summary

  • Design develop and maintain robust backend solutions Framework 4.8 and C#
  • Take ownership of features throughout the full development lifecycle from requirements analysis to production deployment
  • Develop clean maintainable scalable and well-tested code following engineering best practices
  • Support optimize and troubleshoot distributed messaging and service-oriented systems built with MSMQ and WCF
  • Design and optimize SQL Server database structures queries indexes and stored procedures
  • Implement and maintain distributed caching solutions using NCache or similar technologies
  • Participate in architectural discussions focused on scalability reliability and system performance
  • Collaborate closely with developers QA engineers DevOps specialists and product stakeholders
  • Contribute to system monitoring troubleshooting and production issue resolution
  • Ensure high standards of application performance security and maintainability

Qualifications :

  • 4 years of commercial software development experience and C#
  • Familiarity Framework 4.8
  • Solid understanding of OOP principles system design and software architecture
  • Hands-on experience with MSMQ and WCF or similar technologies
  • Good SQL Server knowledge including relational database design query optimization indexing and T-SQL
  • Experience working with distributed caching solutions such as NCache or similar tools
  • Understanding of distributed systems and event-driven architecture principles
  • Experience with unit integration and performance testing
  • Familiarity with non-functional requirements including scalability security high availability and performance optimization
  • At least Upper-Intermediate English level

Remote Work :

Yes


Employment Type :

Full-time


About Company

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At Sigma Software, we are involved with the clientÂ’s team to contribute to the design and development of a technical solution for their tokenized domain reservation platform. We started by assigning a software architect to design the smart contracts and integrate blockchain into the s ... View more

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