Gergely Újvári
Verified Expert in Engineering
Full-stack Developer
Gergely is a senior full-stack developer with over a decade of experience building robust web applications for quickly changing startup environments and larger clients such as E.ON Energy. He specializes in React and TypeScript for the front-end development, Node.js and Meteor for the back end, Apollo GraphQL, and several database systems, including SQL, MongoDB, and Elasticsearch. Gergely was twice awarded the Codility Golden Award for the Muad'Dibs and the Pair a Coder challenges.
Portfolio
Experience
Availability
Preferred Environment
WebStorm, Slack, Meteor, Jira, TypeScript, Linux
The most amazing...
...solution I've developed is a web application for real-time electricity outage monitoring used in 2/3 of a country by hundreds of active operators.
Work Experience
Senior Full-stack Developer
iContest
- Acted as the principal architect of a web application for real-time monitoring of electricity outages in two-thirds of the country with hundreds of operators.
- Developed a fast React-based Google Maps API integration to efficiently display around 10,000 markers and polylines data on the map.
- Contributed as the tech lead of a web application for an energy data visualization dashboard based on Kibana but with custom modules.
Senior Full-stack Developer
GoEssential
- Developed a feature-rich single-page web application with various service integrations for annotating video content.
- Created a small system for handling finite state machines efficiently to control the lifecycles of entities both for manual and automatic state changes. Used this to build a job marketplace inside the application.
- Rebuilt the video library and video player embedded applications into a configurable, modular, modern React application.
Senior Full-stack Developer
GoEssential
- Developed a web application that allows creating web annotations on any site to highlight relevant information and offers easy ways to share the highlighted page. Used Elasticsearch and Express.js for the back end.
- Migrated the project to Meteor and MongoDB, simplifying the architecture.
- Introduced React into the project and moved to video annotations.
Full-stack Developer
Hypothes.is
- Developed a web application that can be used as a browser plugin; it enables the creation of web annotations on any site, adding the ability to start a discussion or comment on specific parts of the page's content.
- Used a Pyramid-based Python back end with an AngularJS front end written in CoffeeScript. Created a stream page to watch all new annotations in real time.
- Supported the open source Annotator project aimed to be the basic framework for web annotations.
Experience
Web Application for Real-time Electricity Outage Monitor
The application was built for a large electric utility company, has several hundred active users, and monitors the electricity in two-thirds of the country.
Job Marketplace
I created a small package to efficiently define finite-state machines and state transitions to achieve this. It became the controller both for the UI and for the server-side to allow/disallow actions and display data based on the state of a job.
Also, UI tools were created to auto-generate the state-transition graph for the whole job process and show a step-by-step progress bar for a job, for example.
Modular Video Library
The library needed to be inserted into any webpage by a simple HTML snippet. So a loading stub was created, and it only needed a client ID to work.
The library itself was built by modules. A module had configuration options (described in a JSON file) and dependencies to other modules. These configuration files were the single sources of truth. Based on them, the configuration UI page (with forms) was auto-generated, and the module dependency was calculated not to load any unused modules.
The clients could configure if they wanted to embed a single video or a full library, maybe with filters. Both iframe and non-iframe embeds were available. Themes were also introduced.
Education
Master's Degree in Computer Science
Budapest University of Technology and Economics - Budapest, Hungary
Certifications
ISTQB Certified Tester Foundation Level (CTFL)
ISTQB
Skills
Libraries/APIs
React, Node.js, Antd, REST APIs, Google Maps API, MobX, Google Maps
Tools
Git, JSX, WebStorm, NPM, GitHub, Kibana, Slack, Jira, Webpack, Mongoose
Languages
ECMAScript (ES6), TypeScript, JavaScript, HTML, SQL, HTML5, C++, Java, C#.NET, Python, GraphQL, Pascal, T-SQL (Transact-SQL), C, CoffeeScript, CSS, C#, CSS3
Platforms
Meteor, Docker, Linux, Amazon Web Services (AWS)
Storage
Databases, JSON, MongoDB, PostgreSQL, NoSQL, Elasticsearch, Redis, PL/SQL, PostGIS, DB, MySQL
Frameworks
Express.js, Next.js, AngularJS, Redux, Pyramid, Bootstrap, .NET, Jest, Cypress
Paradigms
Testing, Agile Workflow, Scrum, Agile, Database Design, Web Architecture
Other
Programming, Algorithms, Coding, Full-stack, Web Services, UI Components, Front-end, Back-end, Back-end Development, Annotations, Apollo, GitHub Actions, Web UI, Board Games, User Interface (UI), Architecture, APIs, SOAP
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