Kamil Serwata
I’m a Senior Software Engineer with 9+ years of experience building scalable web platforms, specializing in backend systems, cloud infrastructure, and full-stack development.
About
I’m a Senior Software Engineer with 9+ years of experience building scalable web platforms, specializing in backend systems, cloud infrastructure, and full-stack development. I’ve designed and delivered production-grade marketplace, fintech, and SaaS solutions using technologies like Node.js, React, AWS, and event-driven architectures with Kafka.
In my recent roles, I’ve led the development of high-performance systems handling large volumes of transactions, implemented secure payment integrations (Stripe, PayPal), and built modular platforms combining e-commerce and community features such as forums, CMS, and real-time interactions. I’ve worked across startups and enterprise environments, consistently focusing on performance, scalability, and clean, maintainable code.
What sets me apart is my ability to take a product from concept to production with strong architectural thinking, combined with hands-on delivery. I don’t just write code—I design systems that scale, make pragmatic technology decisions, and ensure long-term maintainability while keeping business goals in focus.
- 10 years' experience
- Joined November 2025
Industry experience
- Software & Internet
- Retail
- Financial Services
- Professional Services
Work experience· 4 roles
Designed and implemented a scalable Node.js microservices architecture deployed on AWS EKS for a multi-tenant marketplace handling over 1.5M monthly transactions. Optimized service orchestration and caching to reduce API latency by 38%. Built a full-stack marketplace platform with React, Next.js, and TypeScript, accelerating onboarding and engagement. Integrated secure payments via Stripe and PayPal with webhook-driven event processing and reconciliation achieving 99.98% transaction accuracy. Implemented Kafka-based event-driven workflows for real-time order/inventory updates and user notifications. Architected a modular community platform with REST and GraphQL, JWT/OAuth2 authentication, and RBAC. Built admin dashboard for moderation and analytics; optimized PostgreSQL/Redis; Led CI/CD with GitHub Actions and Docker enabling zero-downtime releases. Collaborated in Agile teams, mentoring engineers and guiding architectural decisions.
Developed full-stack SaaS and marketplace applications using React, Node.js, and TypeScript for international clients with up to 500K active users. Designed RESTful and gRPC services to support high-throughput systems, improving inter-service communication by ~35%. Built modular e-commerce features with cart, checkout, and Stripe payments; implemented real-time updates with WebSockets and Kafka; optimized Redis caching and database tuning for peak loads. Led CMS integrations for dynamic content and content management. Migrated and designed scalable AWS EC2/RDS infrastructure; applied TDD with Jest, reducing production bugs by ~30%. Collaborated with cross-functional teams in Agile environments.
Developed modern web applications using JavaScript, React, and Node.js; built backend services with Express REST APIs; implemented responsive UI and ensured accessibility. Worked with MongoDB and PostgreSQL; integrated third-party APIs for payments, notifications, and analytics. Participated in code reviews and Agile ceremonies to maintain high-quality deliverables.
Education
Hire Kamil Serwata today
Post a job and invite Kamil, or contact them directly. No hidden commission.