Personal details
Szymon K.
About
I am an experienced Java Tech Lead/Software Engineer with experience in back end and full stack applications.
I'm great in upgrading quality of code, writing fast and testable solutions, keeping big picture in head while still having eye for details.
Work Experience
Consulting practice embedded with teams from early-stage startups through scale-ups to global enterprises. Full
lifecycle ownership: architecture, development, deployment, production. Clients across fintech, banking, payments,
and travel.
Key Achievements:
• Engineered payment gateway microservices achieving 99.99%+ uptime across multi-region deployments
• Redesigned system architecture supporting 10x scale growth for fintech clients
• Architected AI-powered employee companion integrating LLM models with enterprise workflows
• Built global airline reservations service with enterprise-grade security for PII and payment data
• Built real-time trading platform with streaming data and monitoring, improving client retention
• Led cloud migrations reducing infrastructure costs while improving reliability and scalability
• Drove engineering modernization: trunk-based development, TDD, and CI/CD pipelines
• Executed legacy system migrations using Strangler Fig pattern, minimizing business disruption
• Led engineering teams to become highest-performing units; managed cross-functional teams across timezones
• Built technical knowledge bases and mentorship programs adopted across multiple business units