Bartlomiej Obecny, Developer in Szczecin, Poland
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Bartlomiej Obecny

Verified Expert  in Engineering

Full-stack Developer

Szczecin, Poland
Toptal Member Since
April 16, 2014

Bartlomiej is a true enthusiast for unsolved problems. He is a full-stack developer with more than 15 years of professional experience. Bartlomiej enjoys working with people, is not afraid of changes, is very good at interpersonal skills, and is always open to new challenges.


Dolby Laboratories - Main
TypeScript, Chromecast, JavaScript, Front-end, Jira, HTTP Live Streaming (HLS)...
JavaScript, TypeScript, Digital Rights Management (DRM), Video Streaming, WebGL...
Lyra Entertainment Inc.
JavaScript, Node.js, Nginx-rtmp, WebRTC, NGINX, Streaming, Music Streaming




Preferred Environment

Git, IntelliJ IDEA, OS X

The most amazing...

...thing I've coded was Fly3D routing between any points on a map.

Work Experience

Chromecast, TypeScript, and Video Developer

2022 - 2023
Dolby Laboratories - Main
  • Developed and improved the video player by integrating WebSockets player and Shaka player, allowing users to pause, resume, or rewatch live content for an enhanced and seamless experience.
  • Contributed to an XCD project focused on optimizing movie downloads for improved stability, employing three different CDN servers to mitigate potential failures.
  • Architected a new Chromecast-integrated app for NBC, seamlessly integrating with the SKY player and successfully launching it in 2022, replacing the outdated app.
  • Managed and enhanced an existing NBC app for Chromecast, implementing new features and ensuring its functionality.
Technologies: TypeScript, Chromecast, JavaScript, Front-end, Jira, HTTP Live Streaming (HLS), MPEG-DASH, Widevine, WebAssembly

JavaScript and Video Expert

2021 - 2022
  • Developed HBO Max for different platforms (TV, boxes), integrating a video player.
  • Implemented the OIPF player for TV and integrated it with an existing player.
  • Added a pre-caching movie that users can potentially watch to speed up the start time of the video.
  • Architected and refactored many elements of HBO Max.
Technologies: JavaScript, TypeScript, Digital Rights Management (DRM), Video Streaming, WebGL, Lightning Components, Open IPTV Forum (OIPF), Tizen, Visio, SolidJS

Back-end Developer

2020 - 2021
Lyra Entertainment Inc.
  • Created and designed the back end, database, and front end for a new music and video streaming app.
  • Created an admin panel back end and front end with the possibility of converting music and video and uploading automatically to Amazon S3.
  • Managed front-end development, helping recruit developers and perform code reviews.
  • Set up all infrastructure, initially on dedicated servers, and later migrated to AWS.
Technologies: JavaScript, Node.js, Nginx-rtmp, WebRTC, NGINX, Streaming, Music Streaming

Senior JavaScript Developer

2019 - 2021
LightStep (via Toptal)
  • Maintained the OpenTelemetry API in JavaScript for both Node.js and browser.
  • Was one of the main contributors for developing OpenTelemetry JavaScript. Created many parts of OpenTelemetry, including tracing and metrics.
  • Released stable tracing version 1.0 and experimental for metrics.
  • Reviewed many PR from many different contributors.
  • Created all main plugins for the web and also many plugins for Node.js.
  • Created the most popular exporter, Collector Exporter for OpenTelemetry JavaScript for tracking and metrics.
Technologies: TypeScript, JavaScript, Node.js, Analytics, Full-stack, Architecture, Software Architecture

Senior JavaScript Developer

2019 - 2020
Infinity Lending Systems (via Toptal)
  • Created the front-end prototype for a new payment system using TypeScript, Angular 8, and Angular Materials.
  • Created a standalone component for taking payments that can be embedded into any website.
Technologies: Azure, SQL, TypeScript, Angular Material, Angular, Full-stack, Architecture, Software Architecture

React Expert

2019 - 2019
Reddit (via Toptal)
  • Created a video module for the admin panel for approving videos. The video module supported different filters, generating thumbnails without a back end.
Technologies: Canvas, Video Streaming, Redux, React, TypeScript, Architecture, Software Architecture

Full-stack Engineer

2018 - 2019
FastSwims (via Toptal)
  • Built a working product from scratch to organize swimming competitions in the USA.
  • Created a whole back end using Node.js and Sequelize.
  • Created a front-end SPA using React, Redux, and Saga.
  • Integrated with payment systems and Mixpanel analytics.
  • Created converters for swimming results that comply with USA Swimming Data Interchange format.
  • Created auto import of swimming results from an external web page.
Technologies: Amazon Web Services (AWS), Sass, PostgreSQL, Relational Database Services (RDS), Sagas, Redux, React, Sequelize, Node.js, Full-stack, Architecture, Software Architecture

Senior JavaScript Developer

2018 - 2018
Video Chat
  • Created a Video.js plugin for WebRTC livestreaming video integrated with Wowza Servers.
Technologies: Video.js, Wowza, JavaScript, WebRTC, Full-stack, Architecture, Software Architecture

Senior JavaScript Developer

2016 - 2018
  • Created DOWNStream for Electron, an open-source project for downloading DASH movies.
  • Created a desktop app for downloading movies based on Electron and React.
  • Worked on ongoing development of PRESTOPlay for browsers.
  • Implemented smooth streaming.
  • Created a video tracking plugin for Video.js.
  • Integrated analytics for "conviva" and "nice people at work."
  • Implemented Chromecast sender and receiver.
  • Created util for processing subtitles which were images using canvas and then to be able to change the color of subtitles.
Technologies: Encrypted Media Extensions (EME), Node.js, Electron, Video Streaming, JavaScript, Full-stack, Architecture, Software Architecture

Freelance Node.js Developer

2016 - 2016
Slash-hyphen (via Toptal)
  • Added a few new features to a Slack bot.
Technologies: JavaScript, Node.js, Emacs, Botkit, Full-stack, Architecture, Software Architecture

Freelance Senior JavaScript Application Engineer

2016 - 2016
Placester (via Toptal)
  • Created a Node.js service for importing contacts.
  • Created a new extendable modal.
  • Integrated with Localytics.
  • Created a module for partner scripts so that they can inject HTML fragments and custom scripts.
  • Fixed many bugs and improved stability in the admin panel.
Technologies: Node.js, PHP, CSS3, HTML5, Less, Marionette.js, Backbone.js, JavaScript, Full-stack, Architecture, Software Architecture

Owner and Freelance Developer

2013 - 2016
  • Developed an AngularJS app for file sharing.
  • Worked on presentations for a mobile conference.
  • Worked on video and audio streaming based on Node.js and DynamoDB.
  • Worked on a document data flow app, using Node.js and AngularJS.
  • Created a finance report and statistics web app using Node.js, AngularJS, PostgreSQL, and HighCharts.
  • Worked on a new responsive web app for ING Bank Śląski using Marionette, Backbone, and Node.js.
Technologies: Python, Thymeleaf, Java, Linux, Git, jQuery, PHP, Bootstrap, Sass, CSS, HTML5, Bower, Gulp, Grunt, AngularJS, Full-stack, Software Architecture

Freelance Senior Front-end Developer

2014 - 2015 (via Toptal)
  • Created a vanilla JS library for for toggling and shuffling elements on the page.
  • Improved the build process using Gulp, Jasmine unit tests, and documentation using JSDoc.
  • Integrated with and Mixpanel.
  • Used a TypeForm to collect data about pet quizzes and then presented aggregated data on a custom SVG chart.
  • Refactored campaign pages and brand pages.
  • Optimized the generation of emails using improved SQL queries and stored procedures.
  • Built a pure CSS solution for star ratings.
  • Refactored the Ouibounce library (exit intent) to work on mobile, also adding some improvements.
  • Integrated action forms.
Technologies: JSDoc,, Jinja,, Highcharts, Bash, CircleCI, Karma, Jasmine, Mixpanel, Google Analytics, MySQL, Python, Django, Handlebars, Gulp, Backbone.js, AngularJS, Sass, Stylus, CoffeeScript, JavaScript, Full-stack, Architecture, Software Architecture

Freelance Developer

2014 - 2014
FindTheBest (via Toptal)
  • Created a prototype app using AngularJS.
  • Integrated with family search API using a third-party SDK.
Technologies: Bootstrap, AngularJS, JavaScript, Full-stack, Architecture, Software Architecture


2012 - 2013
  • Created an HTML text editor in vanilla JS.
  • Developed a web app for taking notes using PHP 5, JavaScript, and Python.
  • Prototyped an e-learning platform using Java and HTML5.
  • Prototyped using
Technologies: MySQL, PostgreSQL, Apache, Debian Linux, Git, jQuery, Python, PHP 5, JavaScript, CSS, HTML5, Full-stack, Architecture, Software Architecture

Senior Engineer

2009 - 2012
Nokia Gate 5
  • Worked on creating a route between points on a map using JavaScript.
  • Developed a traffic data visualization and public transportation routing using JavaScript and REST.
  • Developed Flying 3D, a simulator for any route, using JavaScript.
  • Developed an interface for on-map weather information, using Java, Python, and JavaScript.
  • Developed a build stats tool for Jenkins in Python.
  • Tested with Jasmine, JBehave, and Cucumber.
  • Applied continuous integration using Jenkins, Maven, and Puppet.
Technologies: Varnish, Splunk, Git, Subversion (SVN), Continuous Integration (CI), Puppet, Jasmine, JBehave, Behavior-driven Development (BDD), Test-driven Development (TDD), jQuery, Scrum, Agile, Apache Maven, Python, Java, JavaScript, CSS, HTML, Full-stack, Architecture, Software Architecture

Senior Developer

2009 - 2009
Web Solutions
  • Helped develop a search module for over 500 domains.
  • Developed a multi-threading service for domain search using C# IIS.
  • Developed an administration panel for office support.
  • Developed a payment gateway with credit cards, using REST and C#.
  • Used Mono framework.
Technologies: EPPlus, XML, SMTP, HTTP, Web Services, MySQL, C#, Visual Basic, Mono, ASP.NET, Visual Basic for Applications (VBA), Microsoft Visual Studio, Ajax, Test Cases, JavaScript, XHTML, Subversion (SVN), IIS, .NET, Full-stack, Architecture, Software Architecture

Team Leader

2007 - 2009
Where Are You Now
  • Implemented a new mailbox using data migration, C#, and JavaScript.
  • Developed geolocations—a map point and Google Maps—creating a new database for towns from all over the world.
  • Developed contact imports from an address book, optimizing an existing mechanism.
  • Implemented full search using Visual Basic and MS SQL.
  • Developed Carbon Footprint, calculating the amount of GHG (greenhouse gas) emissions caused directly and indirectly by traveling around the globe.
  • Developed Friends Book, a module for keeping in touch with friends. Implemented many changes and optimizations.
Technologies: XML, SMTP, HTTP, Web Services Description Language (WSDL), Scrum, FTP, Web Services, CSS, Visual Basic 6 (VB6), OpenVPN, MySQL, ASP.NET, Microsoft SQL Server, Active Server Pages (ASP), Subversion (SVN), Ajax, SQL, JavaScript, XHTML, SOAP, IIS, .NET, Full-stack, Architecture, Software Architecture

Web Developer

2006 - 2007
Where Are You Now
  • Worked on an integration with Virtual Earth and Google Maps, using JavaScript.
  • Developed a trip profile page and a travel guide using JavaScript and CSS,.
  • Worked on integration with third parties using web services and SOAP.
Technologies: XML, SMTP, HTTP, Web Services Description Language (WSDL), FTP, Web Services, CSS, Visual Basic 6 (VB6), OpenVPN, MySQL, ASP.NET, Microsoft SQL Server, Active Server Pages (ASP), Subversion (SVN), Ajax, SQL, JavaScript, XHTML, SOAP, IIS, .NET, Full-stack, Architecture, Software Architecture

Owner and Freelance Developer

2000 - 2007
  • Developed a web application for document flows inside the company, using PHP, JavaScript, CSS, and Ajax.
  • Built client/server applications for managing documents flows between architects, such as time sheets, costs, reminders, reports, LAN chat, and progress for each project, using Delphi and dBase.
  • Created a data warehouse for a company which sells steel pipes. Used PHP, JavaScript, CSS, and MySQL.
  • Programmed applications to generate statistics for the National Lottery. Used Delphi and dBase.
  • Developed a client/server application for managing and controlling the computers in an Internet Café. Used Delphi, TCP/IP, and UDP.
  • Built an application for managing a cemetery, using Delphi and dBase.
Technologies: dBASE, Apache, CSS, HTML, JavaScript, Ajax, MySQL, PHP, Software Architecture

Software Developer

2005 - 2006
Agryf S.A. - Animex Group
  • Created reports with a custom app, implemented with Delphi, dBase, and Firebird.
  • Made reports for various departments, using Delphi, dBase, Firebird, and Oracle 8i.
  • Administrated the company network, using Novell, DHCP, and SSH.
  • Developed a dedicated application for reading wages using Assembly, PASCAL, and dBase.
Technologies: SMTP, FTP, Assembler, Novell NetWare, XML, Pascal, Firebird, TCP/IP, Oracle, SSH, OpenVPN, DHCP, SQL, HTTP, Delphi

Software Developer

2005 - 2005
Public Hospital
  • Developed various small apps using Delphi and dBase.
  • Performed server administration in Novell, UNIX, Oracle, and Informix.
  • Developed the web page using JavaScript, CSS, HTML, MySQL, and PHP.
  • Implemented a daily work scheduler using PHP, Delphi, MySQL, and JavaScript.
Technologies: CSS, HTML, JavaScript, PHP, Linux, IBM Informix, Unix, SMTP, FTP, Novell NetWare, TCP/IP, Oracle, Ethernet, SSH, OpenVPN, DHCP, SQL, HTTP, Delphi

IT Technician, Software Developer

2001 - 2002
Aeris Computers
  • Created web pages using JavaScript, HTML, and CSS.
  • Built new workstations.
  • Helped with computer software and harder IT tasks.
  • Developed a desktop app for updating warehouse, in Delphi and MySQL.
Technologies: CSS, HTML, JavaScript, PHP, SQL, Delphi

A framework for collecting traces and metrics from applications. I am the maintainer for this open-source project for an OpenTelemetry API in JavaScript and TypeScript, both Node.js and browser. I created and designed the exporters, metrics, core, SDK, and plugins for auto instrumentation, including:
• XMLHttpRequest
• Fetch
• GraphQL
• Fastify
• Document load
• User interactions


Created the front-end prototype for a new payment system using TypeScript, Angular, and Angular Material.

Video Admin Module

Created a video module in the admin environment for moderating users' videos. Added various filters and controls to be able to manipulate the content. Added a module for generating thumbnails on the fly without a back end.

Tech stack: TypeScript, React, Redux, Canvas

I built the FastSwims website from scratch including the back front end.

WebRTC Video Chat

Created a WebRTC client to be used with Wowza Server for live streaming with very short response time. WebRTC client has been developed as a plugin that can be easily used with Video.js.

PRESTOPlay for Browsers

Worked on PRESTOPlay for Browsers, a video player for playing dash, smooth streaming, and HLS protected content through popular browsers.

DOWNStream for Electron
An open-source project for downloading DASH movies.

Technologies: JavaScript, Node.js, Electron

I worked on the admin panel for, which is a data company in the real estate industry. I have also created a new service in Node.js for importing contacts.

Responsive Web App for ING Bank Śląski

Worked on a new responsive web app for ING Bank Śląski using Marionette, Backbone, and Node.js.

Consumer Affairs

I worked on the Consumer Affairs website, which includes consumer news, recall information, and tens of thousands of pages of consumer reviews.

Family Tree Builder

I created a prototype integration with Family Search API using AngularJS.

Video Live Streaming

An app that shows live video streams on the web.

Back-end tech: Node.js, AWS, Elastic Beanstalk, Amazon SDK, EC2, Powershell, DynamoDB, FFMpeg, Wowza

Front-end tech: Angular, HTML5, Canvas, AudioContext, FFMpeg, Web sockets, Web workers

Document Data Flow

An app for document flow in a company with some reports. Used Node.js, PostgreSQL, Angular, HighCharts, and a dedicated server with Proxmox openVZ.

Finance Reports and Statistics

A web application for generating reports for finance metrics and statistics. Used AngularJS, Node.js, HighCharts, and PostgreSQL.

File Sharing

I built a front-end app for file sharing. Used Angular, Grunt, Karma, Jasmine, and Bootstrap.


I created a startup, a web app for taking notes.

Nokia Maps

I helped develop, now known as Mostly worked on routing.

Danish Domain Registrar
I worked on a web-based system for internet domain registration and management.

Angular i18nT
This is an Angular translation module, with custom filters for different languages and support for different grammar cases.

Intelligent House

My thesis in technical school: “Using Computers to Manage Domestic Appliances at Home."

I created and designed some electronic devices, which you could connect in clusters of up to 8. Six of them were similar to on/off switches, and two also had possibilities to change the power.

This electronic device cluster was plugged into computers using parallel ports, and windows-based application were able to manage those 8 devices. There were several possibilities for automatic management, including randomized signals. The main idea was to protect the user's home against burglars while he was away.

I received the "Technician of the Year" state award in Poland for this project, in 2000.

Technologies: C++, Bascom, Assembler, Dbase, Protel, Circuit Simulator


I worked on improvements for Slackbot.
2000 - 2005

Master's Degree in Computer Science and Econometrics

University Of Szczecin - Szczecin, Poland

1995 - 2000

College Degree in Electronics

Technical School in Slupsk (College) - Slupsk, Poland


React, jQuery, Node.js, REST APIs, WebRTC, Redux-Saga, Shaka Player, HTML5 Web Workers, Backbone.Marionette, Underscore.js, Backbone.js, EPPlus, Handlebars, Highcharts,, Marionette.js, Google Cast API, Puppet.js, Amazon API, React Redux, Nginx-rtmp, WebGL, SolidJS


Webpack, Git, Stylus, Gulp, Slack, GitHub, Karma, Bower, Mercurial, Grunt, Sequelize, Jira, Apache, Puppet, Subversion (SVN), Splunk, Varnish, Microsoft Visual Studio, OpenVPN, Novell NetWare, IntelliJ IDEA, Google Analytics, CircleCI,, Emacs, Canvas, Botkit, Wowza, Adobe Photoshop, Apache Maven, Eclipse IDE, NGINX, Visio


Video.js, Jasmine, Bootstrap, AngularJS, Redux, Jinja, Ionic, JBehave, Express.js, Yii, Angular Material, Angular, Electron, Lightning Components, .NET, ASP.NET, Django, Hibernate, Spring, Mono, Thymeleaf, Jest


Sass, TypeScript, ECMAScript (ES6), SQL, Less, HTML5, CSS, JavaScript, HTML, JavaScript 6, JavaScript 5, CSS3, PHP, Bash Script, CoffeeScript, Markdown, PHP 5, XHTML, Visual Basic for Applications (VBA), XML, Active Server Pages (ASP), Visual Basic 6 (VB6), Web Services Description Language (WSDL), Delphi, Pascal, Assembler, dBASE, Bash, Java, C#, Python, Visual Basic


Responsive Web Design (RWD), Scrum, Design Patterns, Continuous Deployment, Continuous Integration (CI), Unit Testing, Agile Software Development, Object-oriented Programming (OOP), Web Architecture, Database Design, Testing, RESTful Development, Test-driven Development (TDD), Behavior-driven Development (BDD), E2E Testing, Continuous Delivery (CD), Continuous Development (CD), Agile, MEAN Stack


MacOS, iOS, Amazon EC2, AWS Elastic Beanstalk, Linux, Debian Linux, Tizen, Oracle, Unix, OS X, Mixpanel, Azure, Web, Windows, WordPress, Amazon Web Services (AWS), Music Streaming


PostgreSQL, MySQL, SQL Architecture, Firebird, IBM Informix, Amazon DynamoDB, Memcached, Microsoft SQL Server, NoSQL

Industry Expertise

Open IPTV Forum (OIPF)


HTML5 Video, Media Source Extensions, Encrypted Media Extensions (EME), Web App Development, Code Architecture, Architecture, RESTful Web Services, Full-stack, Web Development, Over-the-top Content (OTT), Software Architecture, Chromecast, HTTP Live Streaming (HLS), Smooth Streaming, Video Streaming, UI Testing, UI Frameworks, Team Leadership, Smart TV, Lighting, IIS, Test Cases, Ajax, Web Services, HTTP, SMTP, SOAP, FTP, DHCP, SSH, TCP/IP, Ethernet, JSDoc, Sagas, Relational Database Services (RDS), UX Architecture, Scraping, Technical Leadership, Analytics, Computer Science, Electronics, Streaming, Digital Rights Management (DRM), Front-end, MPEG-DASH, Widevine, WebAssembly

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