Mikael Tan

Delivered multiple FinTech analytics and payment platforms for European clients, working within Agile cross-functional teams of designers, analysts, and engineers.  Designed and developed React (Vite, Material UI) frontends and NestJS/Express backends powering real-time transaction dashboards and partner onboarding flows.  Built a payment routing and settlement engine with PostgreSQL, Redis, and AWS Lambda, processing multi-currency transactions under PSD2 compliance.  Led architectural migration from AngularJS to React + TypeScript, introducing shared SASS/SCSS design systems for brand consistency across projects.  Partnered with business stakeholders and product owners to translate requirements into user stories, ensuring iterative delivery through Scrum ceremonies (sprint planning, retrospectives).  Automated CI/CD pipelines using Docker, Terraform, and GitHub Actions, enabling rapid testing and zero-downtime deployments.  Conducted code reviews, technical onboarding, and weekly knowledge-sharing sessions across distributed teams in the Netherlands, Poland, and India.  Mentored junior developers on API design standards, REST versioning, and GraphQL schema governance across client projects.

Contributed to the Neonomics Open Banking Platform, connecting 2 000 + European banks through secure REST and GraphQL APIs.  Implemented Spring Boot and NestJS microservices for data aggregation, transaction processing, and consent validation within Agile squads of 6–8 engineers.  Built the developer portal with React + Vite + Material UI, giving partners API keys, test environments, and analytics dashboards.  Introduced Express middleware for rate limiting, logging, and circuit breaking across 20 + bank connectors, cutting API timeouts by 20 %.  Cooperated closely with QA, DevOps, and compliance teams to ensure regulatory (PSD2/GDPR) adherence, using Kanban boards and daily stand-ups for progress tracking.  Deployed and monitored microservices on AWS ECS, configuring CloudWatch and Grafana for runtime metrics and SLO compliance.  Authored internal documentation and API usage guides, helping new developers onboard to the open-banking ecosystem 50 % faster.

Contributed to the HelloPrint Online Printing Platform, a multi-vendor marketplace for on- demand print and packaging orders.  Implemented storefront and admin features using Vue.js / Nuxt.js with Laravel REST APIs, collaborating daily with UI/UX designers under Agile Scrum methodology.  Developed an Express.js checkout service integrating Stripe and Mollie payments, and Shippo/UPS/FedEx shipping APIs for automated logistics.  Built a GraphQL product catalog API and caching layer on MongoDB, improving page performance and reducing server costs.  Participated in sprint planning, backlog grooming, and QA cycles; contributed actively during retrospectives to improve team velocity and code quality.  Assisted senior engineers in Docker containerization and AWS ECS deployment, introducing automated smoke tests to CI pipelines.

Joined the Vivaldi Browser core team, collaborating with front-end, C++, and QA engineers across Norway and Iceland using Scrum-based release cycles.  Implemented browser modules—bookmarks, tabs, and settings—using C++, Preact, and Chromium Blink APIs, ensuring consistent cross-platform performance.  Built internal Express + GraphQL services for telemetry, build metadata, and performance dashboards used by QA and release management.  Created cross-platform settings sync functionality with WebSockets + PostgreSQL, synchronizing user data across millions of devices.  Assisted QA automation with Node-based test scripts and Vite build tools to reduce regression time per release by 25 %.  Collaborated closely with designers, translators, and localization engineers to ensure browser UI met accessibility and i18n standards.