Linas is available for hire
Hire LinasLinas Ozeraitis
Verified Expert in Engineering
Augmented Reality (AR) Developer
Vienna, Austria
Toptal member since October 20, 2017
Bio
Linas is a creative full-stack senior developer. With 10+ years of experience in a broad range of software development projects, he focuses intensely on productivity and quality. Linas looks at software development as a craft and constantly works on improving his skills and knowledge.
Portfolio
ARIOT
WebSockets, WebRTC, Mixed Reality Toolkit (MRTK), BIMserver, Xeogl, Three.js...
Freelance
Docker, Firebase, GraphQL, REST, Angular, React, Webpack, HTML5, Node.js...
Apprentice
HoloLens, Unity3D, C#, Unity
Experience
- JavaScript - 12 years
- Augmented Reality (AR) - 5 years
- React - 5 years
- Three.js - 4 years
- TypeScript - 4 years
- HoloLens - 2 years
- Mixed Reality Toolkit (MRTK) - 2 years
- WebXR - 2 years
Availability
Part-time
Preferred Environment
JavaScript, TypeScript, WebXR, Virtual Reality (VR), Augmented Reality (AR), React, Git, Unix
The most amazing...
...I've built: a platform for real-time communication between users and an Arduino robot, playing piano while streaming from the John and Yoko suite in Amsterdam.
Work Experience
Founder | Technical Lead
2018 - PRESENT
ARIOT
- Developed system architecture and implementation for a BIM-based augmented reality software for quality assurance in architecture, engineering, construction, and facility management industries.
- Hired and managed back end, unity, and graphics development team. Was responsible for the strategy of further product development. Directly acquired new partners and potential clients.
- Designed and implemented augmented reality "viewers" for iOS, Android, DAQRI, and Hololens (ARKit, ARCore, MRTK).
- Designed and implemented a 3D front-end dashboard to view visualize 3D IFC facility models and the sensory/QA data associated with that facility.
- Designed and implemented a back-end layer to enable CRUD and real-time communication for the IFC data.
- Investigated and set up a JAVA based BIM server to act as an IFC to geometry converter and revision manager.
- Developed a 'remote expert' application for Hololens and a web app. https://www.youtube.com/watch?v=kMNqXaQVX3c.
Technologies: WebSockets, WebRTC, Mixed Reality Toolkit (MRTK), BIMserver, Xeogl, Three.js, GraphQL, React, Firebase, Node.js, HoloLens, ARKit, ARCore, Augmented Reality (AR), Unity
Freelance Developer
2017 - PRESENT
Freelance
- Created online interactive learning/skill testing tools for Austrian State Agencies.
- Built an online local food delivery system.
- Developed a system with real-time data mining, big-data management, and load balancing for an interactive navigation app.
- Created a browser-based platform for realtime video conferencing.
Technologies: Docker, Firebase, GraphQL, REST, Angular, React, Webpack, HTML5, Node.js, JavaScript, Unity
Hololens Engineer
2020 - 2022
Apprentice
- Developed a Hololens 2 application, creating holograms (drawings, annotations, animated objects, real-time measuring, and a hand recording) for video and image captures for a pharma 4.0 software company.
- Created a Hololens 2 application to train lab workers on using a bio-reactor in a clean room.
- Worked with the DevOps team to devise a solution to configure the Hololens app to use different APIs when installed via MDM (something Microsoft does not provide out of the box).
- Used ArUco markers, azure object tracking, improved voice commands, and improved QR scanning functionality.
- Created onboarding scenes teaching users how to employ the app and Hololens (MRTK) interactions, built UX solutions enabling better interaction experience to boost a worker's performance with the custom windowing system and user handedness selection.
Technologies: HoloLens, Unity3D, C#, Unity
Senior JavaScript Graphics Engineer (AR and 3D)
2019 - 2020
Non Disclosure Agreements Constraints
- Developed a web-based augmented reality player with more than 500,000 views in the first months.
- Optimized the WebGL rendering performance and the pipeline for faster loading of the 3D models.
- Adapted the .basis/ktx format to get a massive reduction in GPU memory consumption.
- Augmented the user experience with 3D special effects.
Technologies: Augmented Reality (AR), Three.js, React
Senior Software Developer
2014 - 2017
ovos.GmbH
- Designed and developed an augmented reality framework to be used on LAN connected devices.
- Collaborated with "Volkswagen" on implementing augmented reality training scenarios for an assembly line (http://www.arvida.de).
- Introduced and optimised new workflows to work with browser-based 2D and 3D content.
- Working with Bank Austria implementing various tools, from interactive chart services (https://rechner.bankaustria.at/100_EUR_Chart/index.php) to user interfaces for ATM machines for Bank Austria.
- Collaborated with "Karlsruhe Institute of Technology" in implementing and testing principles of "Semantic web" in practical applications.
Technologies: NGINX, Apache, CSS, HTML5, JavaScript, Unity
Software Developer
2010 - 2014
ovos.Gmbh
- Worked on various websites, including award-winning Austrian online Pavilion for World Expo.
- Collaborated with "Steinway and sons" implementing award-winning online piano tool.
- Consulted and worked on PHP code and MySQL routines optimisation to bring websites to blazing speed.
Technologies: AS3, Flash, Apache, CSS, HTML5, JavaScript
Senior developer
2009 - 2010
iMeal.eu
- Led a team in building an online food delivery service.
Technologies: CSS, HTML, JavaScript, Apache
Freelance Web Developer
2003 - 2009
Freelance
- Worked with organizations from around the world, developing websites that include eCommerce, booking, portfolio, blog, and multilingual functionalities.
- Increased traffic and enhanced page ranking by improving website structure, performing Search Engine Optimization (SEO) and Search Engine Marketing (SEM) for local improvements.
- Developed UI/UX strategies that include wireframes and mockups and for small and medium-sized companies.
- Designed and implemented .NET interface for local newspaper archiving platform.
- Designed and developed several content management systems based on LAMP stack.
Technologies: JavaScript, Flash ActionScript, XML, HTML, .NET, Unity
Web Developer
2001 - 2003
IDEA "Interaktyvi reklama"
- Built state of art (for that time) websites.
- Developed and maintained in-house CRM and CMS.
- Designed web-based games with Flash (AS2/AS3).
Technologies: JavaScript, HTML, Apache
Experience
AR-AQ-Bau — Use of Augmented Reality for Acceptance and Quality Assurance on Construction Sites
https://nachhaltigwirtschaften.at/en/sdz/projects/ar-aq-bau.phpI developed an augmented reality application for quality assurance in the AEC industry.
The project consists of two main parts:
- The dashboard is a web app where the user can upload/view/manage their building information models (BIM).
- The augmented reality (AR) app is an app where the user can precisely position and track virtual models within the actual environment.
The project consists of two main parts:
- The dashboard is a web app where the user can upload/view/manage their building information models (BIM).
- The augmented reality (AR) app is an app where the user can precisely position and track virtual models within the actual environment.
HoloLens Remote Expert
https://www.youtube.com/watch?v=kMNqXaQVX3cI developed and customized a remote-expert system for HoloLens and web platforms.
The remote expert enables a person to see and 'feel' the environment of another person wearing HoloLens.
Features:
- Two-way audio/video communication.
- Spatial geometry streaming from HoloLens and rendering in the web app.
- Freehand drawing tool in AR.
- Screen sharing: PC to HoloLens.
- File sharing: PC to HoloLens.
- Remote screen recording (record HoloLens video/audio/holograms and instantly save on remote PC).
The remote expert enables a person to see and 'feel' the environment of another person wearing HoloLens.
Features:
- Two-way audio/video communication.
- Spatial geometry streaming from HoloLens and rendering in the web app.
- Freehand drawing tool in AR.
- Screen sharing: PC to HoloLens.
- File sharing: PC to HoloLens.
- Remote screen recording (record HoloLens video/audio/holograms and instantly save on remote PC).
Senior JavaScript Graphics Engineering (AR and 3D)
I developed a web-based augmented reality player with more than 500,000 views in the first months.
I also optimized the WebGL rendering performance and the pipeline for faster loading of the 3D models and adapted the .basis/ktx format to get a massive reduction in GPU memory consumption.
I also optimized the WebGL rendering performance and the pipeline for faster loading of the 3D models and adapted the .basis/ktx format to get a massive reduction in GPU memory consumption.
AR Research Project for VW
https://ovos.at/de/projekte/volkswagen-setzt-auf-augmented-reality-fur-interaktives-training/Research project for Volkswagen, implementing educational training with AR glasses for an assembly line.
React/Redux Page — Oegreissler
http://www.oegreissler.at/Oegreissler is a platform for farmers and their clients to provide the best experience for delivering local products to nearby neighborhoods.
Gentics Mesh UI
https://github.com/gentics/mesh-uiAn Angular CLI-based UI for a headless content management system.
React/Redux Page — Online Test
http://onlinetest.unternehmerinmachtschule.atA website for an Austrian state agency to test the skills of young people to determine if they are ready to become an entrepreneur.
Piano for Peace — Amsterdam
https://ovos.at/en/projekte/piano-for-peace-amsterdam-2/A live stream in memory of the legendary bed-in by John Lennon and Yoko Ono
On March 26, 2012, a live stream of the “Piano for Peace” campaign recalled the legendary bed-in by John Lennon and Yoko Ono in the Hilton Hotel in Amsterdam. The microsite linked the event with the online community. From March 23-25, users could play their songs via a virtual piano on the microsite and optionally save a picture of themselves.
On March 26, 2012, a live stream of the “Piano for Peace” campaign recalled the legendary bed-in by John Lennon and Yoko Ono in the Hilton Hotel in Amsterdam. The microsite linked the event with the online community. From March 23-25, users could play their songs via a virtual piano on the microsite and optionally save a picture of themselves.
Always up for a Challenge
It's a Chrome experiment with a Halloween cam. Transform your face into ghost mime using face detection and WebGL filters. It can be used for Chrome and Firefox only and needs good lighting conditions.
• Edit: Now Edge, Safari, Android, and iOS. For iOS, it only has image uploads.
• Edit: Now Edge, Safari, Android, and iOS. For iOS, it only has image uploads.
Fluent in Manipulating Pixels on Your Browser
A browser-based game with some awesome nostalgia graphics and sounds.
It came out as a weekend project just for practicing game development on pixel shader skills. Graphics and audio used for the game were already in the public domain.
Stack used: JavaScript/Canvas/PhaserJS
It came out as a weekend project just for practicing game development on pixel shader skills. Graphics and audio used for the game were already in the public domain.
Stack used: JavaScript/Canvas/PhaserJS
Spermex | Educational Game
https://www.youtube.com/watch?v=k1EWrZzghCMSpermex is an educational, tap-fast-as-you-can game for "Österreichische Gesellschaft für Familienplanung."
iOS: https://goo.gl/PhjG0g
Android: https://goo.gl/SMRxtj
iOS: https://goo.gl/PhjG0g
Android: https://goo.gl/SMRxtj
Education
2005 - 2007
Bachelor's Degree in Computer Science
Vilnius Gedinimas Technical University - Vilnius, Lithuania
2001 - 2004
Bachelor's Degree in Computer Science
Vilnius Business College - Vilnius, Lithuania
2002 - 2003
Erasmus Exchange in Computer Science
University of Bedfordshire (Erasmus) - Luton, UK
Skills
Libraries/APIs
Three.js, WebXR, React, Node.js, WebRTC, WebGL, OpenGL
Tools
8th Wall SDK, Canvas, Angular CLI, Adobe Photoshop, HoloLens, Sketch, Git, Apache, NGINX, Flash, Webpack
Languages
Sass, CSS, HTML5, C#, JavaScript, TypeScript, AS3, HTML, XML, Flash ActionScript, GraphQL, SQL, Java, Python
Frameworks
Angular Material, Unity3D, .NET, Angular, Unity, Redux, Chrome, ARKit
Platforms
Firebase, Docker, Unix, Visual Studio Code (VS Code), iOS, Android, ARCore
Storage
MongoDB, NoSQL
Paradigms
Unit Testing, REST, Testing
Other
WebSockets, Augmented Reality (AR), Virtual Reality (VR), Mixed Reality Toolkit (MRTK), Basketball, Mixed Reality (MR), Xeogl, BIMserver, Games, Education, Browsers, HTTP Live Streaming (HLS), Headless Software, Artificial Intelligence (AI)
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