Senior Software Engineer

Department: Engineering

Employment Type: Permanent employee

Schedule: Full-time

Seniority: Experienced

Location: Warsaw, Lublin

• Design, develop, test, and deliver high-quality software features end-to-end, taking ownership of complex functionality across the full stack.
• Actively leverage agentic AI tools in daily development workflow to accelerate delivery, improve code quality, and explore innovative solutions.
• Participate in architectural and technical design discussions, contributing ideas and helping evaluate trade-offs alongside the Technical Lead.
• Collaborate with Product Manager and Product Designer to understand requirements, clarify acceptance criteria, and provide technical input on feasibility and estimates.
• Conduct thorough code reviews, share knowledge with team members, and mentor junior engineers to raise the overall engineering quality of the team.
• Participate in customer support topics and escalations, helping diagnose and resolve technical issues in a timely manner.
• Continuously improve engineering practices by identifying bottlenecks, proposing process improvements, and staying current with relevant technologies.

MUST  HAVES

• Bachelor’s or Master’sDegree in an applicable field, such as Computer Science, Software Engineering, or a related discipline.
• 7+ years of professional experience as a Software Engineer.
• Strongproficiencyin one or more of the team’s core technology stack areas (.NET, MSSQL, modern JavaScript/TypeScript frameworks).
• Deep understanding of data structures, algorithms, and computational complexity withthe abilityto apply them to real-world performance problems.
• Strong knowledge of concurrency, multithreading, and asynchronous programming patterns.
• Experience with performance profiling, optimization techniques, and designing systems for high-load scenarios.
• Proficiencyin designing and building RESTful APIs and working with relational databases, including advanced queryoptimizationand indexing strategies.
• Proven ability to apply software design patterns, clean code principles, and testing practices in production systems.
• Fluency with CI/CD pipelines and version control workflows (Git).
• Ability to work autonomously on complex tasks while communicating progress and blockers effectively.

NICE TO HAVE

• Understandingcloud-native application development and PaaS (preferably Microsoft Azure).
• Experience working in teams with established DevOps culture.
• Experience with enterprise software development and IT Service Management (ITSM) platforms.
• Hands-on experience with containerization technologies (Docker, Kubernetes).
• Practical experience with agentic AI tools like Claude Code, Google Gemini CLI, or OpenAI Codex.

At Matrix42, you'll join cross-functional product squads that tackle complex challenges for our customers and businesses — building solutions that make a real difference in how organizations manage their digital workspaces. 

We actively invest in engineering productivity by embracing agentic AI tools as a core part of our development workflow. Our engineers are encouraged to use agents like GitHub Copilot and Claude Code daily — not as an experiment, but as an established practice that accelerates delivery, improves code quality, and frees up time for creative problem-solving. 

If you are passionate about writing well-crafted software, growing your expertise in a team that values both technical excellence and knowledge sharing, and working at the intersection of modern engineering practices, this is an exciting opportunity for professional growth and impact.We could tell you about the great coffee, parking lot next to the office, and flexible hours. Or that hybrid and remote work are part of the deal. But honestly? That’s just standard. 
Here’s what makes working with us extra special: 

• Work from (almost) anywhere– Want to change your scenery? Go on a workation and take your job with you.
• Time for growth– A career framework to support your professional and personal growth with up to 6 extra days off per year for your development.
• Social Day– One paid day per year to give back to your community or support a cause you care about.
• Poland Sport Card: Use your gym whenever you like! 
• Private medical care
• Development possibilities such as a language learning platformor training subsidies
• Lunch Subsidy (LUBLIN)

Hybrid work is a natural part of how we operate, but we also believe in the power of coming together. That’s why we regularly connect in the office - whenever it makes sense. 
And that’s just the beginning. Ask us what else is waiting for you! Send us your application, including your salary requirements and earliest possible starting date, directly through our online portal via the "APPLY NOW" button. If you have any questions, please do not hesitate to contact Irina Neculae. 

We ask for your understanding that MATRIX42 can only accept applications online via the applicant portal in connection with our applicant management system due to the currently valid EU data protection regulations.