Oliver Walerys, Developer in Amsterdam, Netherlands
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Oliver Walerys

Verified Expert  in Engineering

Single-page Applications (SPA) Developer

Amsterdam, Netherlands
Toptal Member Since
October 14, 2019

Oliver is a senior software architect and full-stack web developer with seven years of experience delivering software from quick-release MVPs to million-user web apps. His experience spans various industries, including education, travel, health, and social media. Oliver prides himself on reliable communication and high-quality deliverables.


Multinational Management Consultancy
TypeScript, Sockets, Vue, Drone CI, Continuous Delivery (CD), Realtime...
Codename Labs
Firebase, Cross-platform, Dart, Flutter, PostgreSQL, MySQL, Laravel...
Tactio Health Group
JSON Web Tokens (JWT), InversifyJS, Express.js, Node.js, ES8, Vue, TypeScript...




Preferred Environment

Visual Studio Code (VS Code), MacOS, TypeScript, JavaScript, React, Vue, Node.js, PHP, DigitalOcean

The most amazing...

...software I architected was a web-based, real-time collaborative learning tool for digital training during the pandemic.

Work Experience

Full-Stack Software Architect

2021 - PRESENT
Multinational Management Consultancy
  • Architected the next-gen multiplayer web platform to decrease response times by 80% on a collaborative remote learning tool.
  • Coordinated with product and design to rebuild a legacy app for a scaled delivery.
  • Mentored developers to transition to web development with Vue.js.
Technologies: TypeScript, Sockets, Vue, Drone CI, Continuous Delivery (CD), Realtime, Integration Testing, Tailwind CSS, Responsive, Technical Leadership

Full-stack Software Consultant

2016 - PRESENT
Codename Labs
  • Created a dashboard-style platform for restauranteurs to monitor the performance of their online delivery orders across marketplaces.
  • Prototyped a cross-platform mobile application for the aviation industry to digitize cockpit activities for small-plane pilots.
  • Developed order-processing software for a uniforms distributor that reduced order processing time by 90% and handled over $10,000 in sales volume per month.
  • Overhauled a leading Canadian influencer advertising platform.
Technologies: Firebase, Cross-platform, Dart, Flutter, PostgreSQL, MySQL, Laravel, Single-page Applications (SPA), React, Vue, ECMAScript (ES6), Node.js, TypeScript, Tailwind CSS, Technical Leadership

Full-stack TypeScript Developer

2018 - 2019
Tactio Health Group
  • Architected a modular single-page app stack to replace legacy web architecture.
  • Mentored junior developers to become capable contributors to the new web stack while codifying best practices.
  • Audited back-end security practices and initiated a major rewrite to ensure strict compliance with health data regulations.
Technologies: JSON Web Tokens (JWT), InversifyJS, Express.js, Node.js, ES8, Vue, TypeScript, Technical Leadership

Full-stack Web Developer and Initiative Owner

2016 - 2018
  • Overhauled a failure-prone, outdated, and mission-critical revenue calculator to reduce annual errors by over 90%, resulting in savings of $500,000.
  • Developed a user-friendly single-page web app for which we hired a team of 12 quality assurance agents.
  • Optimized an internal booking search tool to reduce average response time from seven seconds to 300 milliseconds with a significant MySQL load decrease.
  • Led the initial implementation of BI by developing real-time dashboards, administering SiSense, and training other teams for it.
  • Balanced expectations across departments while writing specifications and delivering quality.
Technologies: Sisense, MySQL, Single-page Applications (SPA), Vue, ECMAScript (ES6), JavaScript, PHP, Technical Leadership


Acelerate empowers restauranteurs to make sense of their delivery business through a bespoke platform that gives them visibility on performance across food delivery marketplaces. I delivered a distributed scraping system with a React web portal for this engagement.


Canada's leading influencer advertising platform allows marketers to partner with top Instagram talent across the country.

Captain's Numbers

Captain's Numbers is a mobile application designed to make flight-planning easier for small-plane pilots.

Internet Business Associate



Node.js, Vue 2, Vuex, Vue, React, InversifyJS, Puppeteer, Plaid API, REST APIs, Sockets


Sisense, NPM, Git, GitHub, Plaid, Webpack, Webpack 4, Flink, PhpStorm, Vagrant, Composer


JSON Web Tokens (JWT), Laravel, Bootstrap 3, Tailwind CSS, Next.js, Bootstrap, Flutter, Electron, Nuxt.js, Express.js, Angular, Realtime, Flask


PHP, TypeScript, CSS, PHP 7, ECMAScript (ES6), HTML, ES8, ES7, SQL, JavaScript, HTML5, Dart, Python


RESTful Development, Reactive Programming, REST, Continuous Integration (CI), Continuous Delivery (CD), Responsive, Testing, Agile, Mobile Development, DevOps, Cross-platform


Linux, Docker, Ubuntu, Visual Studio Code (VS Code), DigitalOcean, iOS, Firebase, Amazon Web Services (AWS), Google Cloud Platform (GCP), Mapbox, Azure, MacOS, Ubuntu Linux, Drone CI, Kubernetes


JSON, MySQL, PostgreSQL, Amazon S3 (AWS S3), Databases, Redis, MongoDB, Memcached, Google Cloud


Front-end, Vue Router, Single-page Applications (SPA), Web Scraping, Web Development, Full-stack, Containers, Integration Testing, Responsive Web Apps, APIs, Responsive UI, Proxies, Minimum Viable Product (MVP), Technical Leadership, Cloud, Software Architecture, Queue Management, Mobile App Development, WebSockets, Architecture, Maps, Webhooks, CTO, Development

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