Senior Software Engineer/Team Leader

SigmaSoftware2

Warsaw, Masovian Voivodeship, Poland Remote permanent

Posted: March 4, 2026

Required Skills

Job Description

Ready to take the lead while staying hands-on with cutting-edge code? Join Sigma Software as a Senior Software Engineer / Team Lead and help shape innovative cybersecurity solutions that protect high-value information assets across multiple sectors.

This is a full-time role, remote across Europe. You’ll lead a small, talented engineering team while working on high-impact, scalable systems.

At Sigma Software, we value freedom to make an impact, technical excellence, and a dynamic culture where experimentation and learning are encouraged. Join us to grow your leadership skills while staying close to the code.

CUSTOMER

Our customer is a leading cybersecurity company developing advanced security solutions that provide autonomous governance, real-time operational enforcement, and protection of high-value information assets. They focus on safeguarding both digital and operational environments, working with compliance-heavy industries such as finance, healthcare, and government, and are known for integrating AI-driven anomaly detection into security protocols.

PROJECT

The project delivers comprehensive visibility and autonomous governance over dynamic execution patterns, enforcing real-time operational protocols to safeguard high-value information assets and neutralize systemic anomalies. You’ll work on scalable solutions, rapid prototypes, and high-security systems in a fast-paced environment.

• Lead and mentor a team of 3 engineers through code reviews, design critiques, career mentorship, and collaboration with integration teams
• Design and build scalable solutions, balancing production-quality code with rapid PoC development
• Own sprint planning and quarterly roadmap execution
• Act as final escalation point for complex technical issues
• Rapidly learn and implement new technologies, strategically managing technical debt

• 5+ years of software engineering experience with strong CS fundamentals, OOP, data structures, algorithms
• Proficiency in Go (preferred) and/or vanilla JavaScript
• Strong SQL skills
• Experience building/maintaining Microservices
• Proven leadership experience while remaining hands-on
• Upper-intermediate+ English

WILL BE A PLUS

• Experience with dashboard development and/or modern UI frameworks
• Background in Cybersecurity or AdTech
• Experience with PCI DSS or other high-security standards

PERSONAL PROFILE

• Hands-on leader who enjoys coding and mentoring
• Comfortable making architectural decisions and driving technical direction
• Adaptable, fast learner, thrives in dynamic environments

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