István Mező
Verified Expert in Engineering
JavaScript Developer
Boston, MA, United States
Toptal member since October 1, 2021
Istvan is a tech lead with eight years of experience building applications used by millions of people worldwide. He has been using Angular since its release and can handle back-end tasks in multiple languages, including Node.js, Python, and Java. Istvan has been the lead engineer on a number of projects, working closely with other domain experts while delegating and implementing technical tasks.
Portfolio
Experience
- JavaScript - 7 years
- TypeScript - 6 years
- Angular - 6 years
- Node.js - 4 years
- Express.js - 3 years
- Docker - 3 years
- AngularJS - 2 years
- PostgreSQL - 2 years
Preferred Environment
Ubuntu, MacOS, Visual Studio Code (VS Code), Slack, Jira, Cursor AI, Claude
The most amazing...
...product I've worked on is cozycozy, an accommodation metasearch engine used by millions of people since its launch.
Work Experience
Senior Front-end Developer | Tech Lead
Sharecare
- Worked for an international healthcare tech company. Shipped a new feature for our enterprise clients under a tight deadline while collaborating closely with other team members.
- Transitioned the front-end repositories to a common Nx monorepo, improving the code's structure and the developer's experience.
- Introduced domain-driven design (DDD) and development when planning new features.
- Set up a working E2E test suite and coached junior colleagues on how to develop robust tests.
- Led the design and development of full features while working closely with the product, marketing, and clinical teams.
- Spearheaded the development of a new app and oversaw the closed trial testing on iOS, Android, and the web.
Senior Full-stack Developer
Cozycozy.com
- Developed a significant part of the Angular front-end application during the initial launch.
- Maintained and developed new features of the accommodation deduplication framework, including improving the deployment time by 80%.
- Planned and developed a recommendation framework that sends hundreds of email offers to registered users every day.
- Assisted in SEO internationalization of pages to 25+ languages, including the SEO content pipeline and CMS.
- Created a data pipeline for our production data, including the live monitoring, daily reports, and interface for our business analysts.
Senior Front-end Consultant
Miro Digital Technologies
- Streamlined the internal processes related to the front-end development by increasing productivity and allowing faster iterations.
- Communicated with the external UI/UX team, guided them to technical decision-making, and reviewed their code.
- Created and developed the front-end user stories, including the planning and development of an entire feature.
Front-end Developer
Liligo
- Laid the groundwork for developing a brand new user-facing Angular front-end application, including researching the state-of-the-art practices for the similar progressive web app (PWA).
- Presented the state-of-the-art PWA research findings to other developers during internal meetings, Hungarian meetups, and Barcelona's head office meetings.
- Implemented features in the legacy Liligo application written in native JavaScript and solved the long outstanding bugs, which resulted in increased revenue.
Software Engineer
GE Healthcare
- Acted as a core member of a new Angular front-end team, developing a completely new product for professional athletes.
- Fixed bugs and added new features to a cloud health management application using AngularJS and Spring.
- Performed extensive testing on every level to comply with the regulations for medical devices.
Experience
cozycozy Search Engine
https://cozycozy.comI participated in different parts of this project, from developing the front and back end to taking care of the data infrastructure and building various data pipelines.
ng2-flatpickr
https://github.com/mezoistvan/ng2-flatpickrArticle on a New CSS Solution
Education
Bachelor's Degree in Mechatronics Engineering
Budapest University of Technology and Economics - Budapest, Hungary
Skills
Libraries/APIs
React, REST APIs, Node.js, jQuery, PySpark, RxJS, NgRx, PrimeNG
Tools
Sequelize, Docker Compose, Capacitor, Bitbucket, Slack, GitHub, NPM, Apache Airflow, GitLab, GitLab CI/CD, Spark SQL, IntelliJ IDEA, Nx, Figma, Jira, Cron, Terraform, Claude
Languages
JavaScript, TypeScript, CSS, HTML, HTML5, CSS3, SQL, Java, Python, GraphQL
Frameworks
Angular, Express.js, AngularJS, Ionic, Spring Boot, Spring, Hadoop, gRPC, Angular Material, Bootstrap, Selenium, NestJS
Paradigms
REST, Search Engine Optimization (SEO), E2E Testing, Unit Testing, Test-driven Development (TDD), Behavior-driven Development (BDD), Scrum, Agile, UI Design, UX Design
Platforms
Ubuntu, Docker, MacOS, Kubernetes, Amazon Web Services (AWS), Firebase, iOS, Android, AWS Lambda, Visual Studio Code (VS Code)
Storage
MySQL, PostgreSQL, HDFS, HBase, Hasura, MongoDB, Amazon S3 (AWS S3), NoSQL
Other
Front-end, UI Development, Web Development, Server-side Rendering (SSR), Technical Writing, APIs, Full-stack, API Design, WebSockets, Documentation, API Documentation, Vite, Software Development, Apollo, Teamwork, Integration Testing, Component Libraries, Full-stack Development, Calendars, Google SEO, Organic SEO, Payment APIs, Technical Leadership, Cursor AI
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