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I am a Senior Full Stack Engineer with over 10 years of professional experience, specializing in multi-tenant SaaS architectures, backend hardening, and payment integration using Stripe Connect and subscription billing. I have a strong background in PostgreSQL row-level security, React, Supabase, and data privacy compliance, delivering scalable platforms that serve thousands of users with 99.9% uptime.\n\nI excel at driving product ownership and delivering secure, maintainable code while collaborating with cross-functional teams to transform demos into production-ready solutions. I also focus on secure coding practices, mentoring junior engineers, and ensuring compliance across complex multi-tenant environments.…I am a Senior Full Stack Engineer with over 10 years of professional experience, specializing in multi-tenant SaaS architectures, backend hardening, and payment integration using Stripe Connect and subscription billing. I have a strong background in PostgreSQL row-level security, React, Supabase, and data privacy compliance, delivering scalable platforms that serve thousands of users with 99.9% uptime.\n\nI excel at driving product ownership and delivering secure, maintainable code while collaborating with cross-functional teams to transform demos into production-ready solutions. I also focus on secure coding practices, mentoring junior engineers, and ensuring compliance across complex multi-tenant environments.

Marcin Pham

Full Stack Developer, Web Developer, Back-End Developer, +2

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I am a Senior Full Stack Engineer with over 10 years of professional experience, specializing in multi-tenant SaaS architectures, backend hardening, and payment integration using Stripe Connect and subscription billing. I have a strong background in PostgreSQL row-level security, React, Supabase, and data privacy compliance, delivering scalable platforms that serve thousands of users with 99.9% uptime.\n\nI excel at driving product ownership and delivering secure, maintainable code while collaborating with cross-functional teams to transform demos into production-ready solutions. I also focus on secure coding practices, mentoring junior engineers, and ensuring compliance across complex multi-tenant environments.…I am a Senior Full Stack Engineer with over 10 years of professional experience, specializing in multi-tenant SaaS architectures, backend hardening, and payment integration using Stripe Connect and subscription billing. I have a strong background in PostgreSQL row-level security, React, Supabase, and data privacy compliance, delivering scalable platforms that serve thousands of users with 99.9% uptime.\n\nI excel at driving product ownership and delivering secure, maintainable code while collaborating with cross-functional teams to transform demos into production-ready solutions. I also focus on secure coding practices, mentoring junior engineers, and ensuring compliance across complex multi-tenant environments.

Available to hire

I am a Senior Full Stack Engineer with over 10 years of professional experience, specializing in multi-tenant SaaS architectures, backend hardening, and payment integration using Stripe Connect and subscription billing. I have a strong background in PostgreSQL row-level security, React, Supabase, and data privacy compliance, delivering scalable platforms that serve thousands of users with 99.9% uptime.\n\nI excel at driving product ownership and delivering secure, maintainable code while collaborating with cross-functional teams to transform demos into production-ready solutions. I also focus on secure coding practices, mentoring junior engineers, and ensuring compliance across complex multi-tenant environments.

Skills

Experience Level

Expert

Expert

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Expert

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Expert

Work Experience

Senior Software Engineer at Devs Data LLC

January 1, 2024 - March 1, 2026

Led the development and production hardening of a multi-tenant SaaS platform for mobile service providers, implementing strict Postgres row-level security policies to enforce tenant data isolation and GDPR compliance. Designed and integrated Stripe Connect payment workflows including subscription billing, transaction fee processing, and payout management, increasing payment reliability by 40%. Conducted comprehensive security audits on Supabase backend services, identifying and remediating vulnerabilities to meet enterprise-grade data privacy and security compliance requirements. Refactored AI-generated codebase to improve maintainability and performance, reducing technical debt by 30% and improving API response times by 25%. Collaborated with frontend teams using React and Lovable to synchronize backend APIs and workflows, ensuring seamless user experience across multi-tenant environments. Implemented automated testing pipelines with Jest and Postman to validate payment flows and secu

Full Stack Engineer at 7N Gdańsk

July 1, 2020 - October 1, 2023

Developed and maintained a Healthcare SaaS platform and its mobile app, implementing secure user authentication and HIPAA-compliant data handling. Built and enhanced an AI Chatbot SaaS platform using Node.js, React, and MongoDB, improving user engagement by 35%. Integrated third-party APIs for payment processing and scheduling, facilitating seamless subscription management and event booking. Implemented RESTful APIs and optimized backend services for scalability and reliability under high concurrent user loads. Collaborated with cross-functional teams in Agile environments to deliver iterative product improvements and bug fixes. Conducted code reviews and enforced coding standards to maintain high code quality and security compliance. Participated in DevOps activities including CI/CD pipeline setup and containerization using Docker.

Full Stack Developer at Merixstudio

March 1, 2018 - April 1, 2020

Contributed to the development of a Social Impact Platform and its mobile version, focusing on scalable backend services and responsive frontend interfaces. Implemented React-based UI components and integrated them with Node.js backend APIs to deliver seamless user experiences. Optimized database interactions using PostgreSQL and Sequelize ORM to improve data retrieval times by 20%. Enhanced platform security by implementing OAuth2 authentication and JWT token management. Collaborated with UI/UX designers to translate wireframes into functional features. Participated in sprint planning and retrospectives, contributing to continuous process improvements. Supported junior developers through code reviews and pair programming sessions to elevate team skill levels.