Open to opportunities

Krzysztof S

@krzysztofs

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Senior Full Stack Engineer with 11+ years of experience.

Poland

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What I'm looking for

I am looking for a role that fosters innovation and collaboration, where I can leverage my full stack expertise to drive impactful projects and mentor others.

I am a Senior Full Stack Engineer with over 11 years of experience in designing and delivering high-performance, scalable systems across various domains including e-commerce, platform infrastructure, and fintech. My expertise lies in leading architectural modernization efforts, focusing on containerization, real-time systems, and cloud-native microservices. I have a proven track record of improving system performance and developer experience through innovative solutions such as GraphQL API adoption and reusable component development.

Throughout my career, I have successfully re-architected legacy systems into modern microservices, significantly reducing downtime and aligning services with business objectives. My hands-on leadership style emphasizes values-driven mentoring and collaboration within agile, globally distributed teams. I am passionate about leveraging my technical skills in Node.js, Go, and React to create impactful solutions that drive business success.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

BEIT

Feb 2024 - Present (1 year 5 months)

Re-architected legacy monoliths into containerized microservices, cutting system downtime by 30% and aligning services with business objectives. Led backend design in Node.js and Go, orchestrating asynchronous workflows using GCP Cloud Tasks and Pub/Sub.

Node Go)Cloud Tasks Pub Sub GraphQL React TypeScript Tailwind AWS Cloudwatch Terraform GitHub Actions ArgoCD Docker Kubernetes

Senior Software Engineer

ViSenze

Jan 2020 - Present (5 years 6 months)

Led design of multi-tenant GraphQL APIs, supporting 20+ B2B client integrations across major e-commerce platforms. Engineered payment microservices in Go, enabling 5K+ concurrent orders and reducing latency by 15%.

Go)React Next.js PostgreSQL GraphQL AWS Shopify Magento WooCommerce OAuth Stripe Redis Django Flask

Full Stack Developer

Shopee

Aug 2014 - Present (10 years 11 months)

Delivered web interfaces in React, Angular, and Vue for vendor portals and catalog tools, driving early platform adoption. Developed backend APIs in Node.js and Django, implementing robust web services with authentication and caching.

React Angular Vue Node Django MySQL WebSockets Docker REST JavaScript

Education

Degrees, certifications, and relevant coursework

Singapore Management University

Bachelor of Computer Science, Computer Science

Studied Computer Science, gaining foundational knowledge and practical skills in various aspects of computing. Completed a comprehensive curriculum that prepared for a career in software development and related fields.