Open to opportunities

Marcin Nguyen

@marcinnguyen

Message

Senior software engineer building scalable TypeScript full-stack web platforms with resilient APIs and faster delivery.

Poland

Message

What I'm looking for

I’m looking for a team that values code quality, resilient API design, and automated testing. I want to own architecture and CI/CD, improve performance and observability, mentor engineers, and collaborate with strong stakeholder communication.

I’m a Senior Software Engineer with more than 10 years building and shipping scalable full stack web platforms, specializing in TypeScript/JavaScript and modern React.js + Next.js architectures. I design and implement resilient REST and GraphQL APIs, set up CI/CD with GitHub Actions, and operate automated releases on AWS with Docker and Kubernetes.

I champion code quality and testing with Jest and Cypress (including TDD), and I mentor engineers while driving architecture decisions. In recent roles, I’ve cut lead time by 53%, improved deployment frequency to tri-weekly, increased performance (e.g., faster page loads), and strengthened observability and operational reliability across services.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

ProtecWise Inc

Aug 2023 - Present (2 years 8 months)

Led architecture and implementation of a modular Node.js/Nest.js backend, enabling 3x faster feature delivery across 6 services for 200k monthly active users. Migrated the frontend to React with Next.js/TypeScript and improved CI/CD (tri-weekly deploys, -53% lead time) while reducing API latency 47% and MTTR 40% through caching and end-to-end observability.

Node.Js Nest TypeScript React Next.js PostgreSQL Redis AWS CodeDeploy Lambda S3 Docker Kubernetes NodeJS

Full Stack Engineer

Concirrus

May 2019 - Apr 2023 (3 years 11 months)

Drove company-wide TypeScript adoption, cutting runtime type errors 33% and improving onboarding 25%, then built a React/Redux/TypeScript customer portal that increased engagement 27% and improved trial-to-paid conversions 12%. Delivered backend services (Node.js/Express to Nest.js) supporting 1,500 req/s, improved automated testing (48% to 82% coverage, -41% production incidents), and migrated fr

TypeScript React Redux Node.Js Nest PostgreSQL MongoDB Jest Cypress Terraform NodeJS

Full Stack Developer

VentureCraft

Dec 2017 - May 2019 (1 year 5 months)

Designed React single-page applications and increased session duration 18%, then built Node.js/Express REST services integrating payments and messaging for 30k monthly transactions with secure flows. Optimized PostgreSQL (connection pooling and query tuning) to cut heavy dashboard load times 34% and improved security via OAuth2 hardening, reducing abuse events 78%.

React Node.Js Express REST APIs AWS Elastic Beanstalk Docker PostgreSQL OAUTH2 Cloudwatch Mocha Selenium NodeJS

Frontend Developer

VNG Corporation

Nov 2016 - Nov 2017 (1 year)

Improved frontend performance by reducing page weight 22% and increasing mobile load times 30% using ES6/HTML5/CSS3/JavaScript, and built interactive components in Vue.js. Built a reusable component library and style guide to reduce UI inconsistencies 64%, improved accessibility (Lighthouse score 56 to 87), and localized for SEA markets to cut localization defects 71% while increasing session rete

Javascript (ES6)HTML5 CSS3 Vue.Js Webpack CircleCi Responsive UI