Publication
Introduction to HTTP Live Streaming: HLS on Android and More
https://www.toptal.com/developers/ios/introduction-to-http-live-streaming-hls
Tomo is currently unavailable
Tomo Krajina
Verified Expert in Engineering
SMPP Developer
Poreč, Croatia
Toptal member since February 5, 2014
Bio
Tomo is a Java, Android, and Golang developer with 13+ years of experience. He has worked on Android, web, and back-end applications, telecommunications, and enterprise and banking systems. He is especially interested in all things GPS related.
Portfolio
SCIO
Firebase, Amazon DynamoDB, AWS Lambda, PHP, Android, Google Cloud, Python, Java...
Globio
Fintech, Go
Storie
Android, iOS, Google Cloud Platform (GCP), Java, Go
Experience
- Java - 14 years
- Google Maps - 7 years
- SMPP - 5 years
- Google Cloud - 5 years
- Go - 4 years
- Android - 2 years
- React Native - 1 year
Work Experience
Owner
2015 - PRESENT
SCIO
- Worked and maintained various open source projects.
- Mantained several websites and their internal microservices.
- Developed an Android application for language learning to help users learn new words by going through 10,000 sentences.
- Created an Android application for numeric sequences and time tracking.
- Developed a news aggregation Android application complete with back-end.
- Integrated Android apps with Firebase and Google cloud back-ends.
- Maintained Trackprofiler, the online GPS track editor.
Technologies: Firebase, Amazon DynamoDB, AWS Lambda, PHP, Android, Google Cloud, Python, Java, Go
Back-end Engineer
2017 - 2017
Globio
- Developed the back-end in Golang.
- Implemented various fintech APIs.
Technologies: Fintech, Go
Back-end Engineer
2015 - 2016
Storie
- Implemented a back-end REST API hosted on Google Cloud.
- Implemented video processing workflow.
- Implemented a variant HLS video streaming solution.
- Helped the development of iOS and Android applications.
- Integrated REST APIs with mobile apps.
- Integrated push notifications with mobile apps.
Technologies: Android, iOS, Google Cloud Platform (GCP), Java, Go
Senior Java Developer
2010 - 2015
Infobip
- Developed enterprise SMS messaging systems.
- Implemented various applications using the SMPP protocol.
- Implemented the GSMA OneApi REST API.
- Developed open-source client libraries for the OneAPI REST API.
- Introduced the Git versioning system and worked on a specific Git workflow to be adopted.
- Introduced Groovy scripting for several applications.
Technologies: Ruby, PHP, SMPP, Web Services, Apache Tomcat, Groovy, Python, Spring, Java
Senior Java Developer
2004 - 2010
Istarska kreditna banka (Istrian Credit Bank)
- Implemented an internet banking back-end system.
- Worked on several web applications for internal use.
- Worked on an application for money laundering prevention.
- Implemented a reporting system.
Technologies: AS400, Web Services, Apache Tomcat, Spring, Java
Lead Developer
2005 - 2009
Aqua d.o.o.
- Implemented a bridge between an application for inventory management and the company's CMS (a WordPress plugin and a Java service).
- Implemented a CMS and web shop.
Technologies: Java, PHP
Math and Informatics Teacher
2000 - 2004
Elementary School Poreč
- Taught kids programming (mostly Python) and mathematics.
- Mentored regional and state level competitions.
- Lobbied for the use of open-source technologies in the educational system.
Technologies: Python
Project History
10,000 Sentences
10,000 sentences an Android app for language learning. It helps users learn new words in a foreign language. The idea is to go through 10,000 sentences in a target language. By exposing users to unknown words in a real context (a sentence) they learn new words.
Gpxpy
https://github.com/tkrajina/gpxpyGpxpy is a Python library for GPS/GPX tracks. It implements all the most common algorithms used to manipulate and analyze GPS track data.
GoLongFuncs
https://github.com/tkrajina/golongfuncsA statical analysis tool to discover long and complex functions in Golang. The user decides which measures of complexity to use, for example: number of variables in scope, number of assignments, nested blocks, cyclomatic complexity, ceomplexity per line of code, etc.
Typescriptify Golang Structs
https://github.com/tkrajina/typescriptify-golang-structsA helper tool and library to seamlessly use Golang models in Typescript.
Trackprofiler
http://www.trackprofiler.com/Trackprofiler is an online GPS track editor intended for hikers, mountain bikers, and outdoor lovers. Users can upload their tracks, fix common GPS errors, split or join tracks, add elevation data, etc. Tracks can be uploaded via email or from Dropbox.
Git Introduction: Uvod u git
An introductory book about Git in Croatian.
GraphAnything
https://github.com/tkrajina/GraphAnythingGraphAnything is an Android application to help users visualize various number sequences. For example: tracking weight, running distance and speed, or time spent on a project. It can also be used as a pomodoro timer.
Ftmpl
https://github.com/tkrajina/ftmplFtmpl is a fast, compiled, and typesafe templating language for Golang.
Geo Elevations: SRTM.py
https://github.com/tkrajina/srtm.pyA Python library for the Shuttle Radar Mission Data (SRTM) and the Earth Gravitational Model (EGM2008).
Education
1993 - 1999
Bachelor's of Science Degree in Math
PMF - Zagreb
Skills
Libraries/APIs
Google Maps, Leaflet, jQuery, JasperReports, jQuery UI
Tools
Firebase Cloud Messaging (FCM), Android Studio, IntelliJ IDEA, Vim Text Editor, LaTeX, Shell, Apache Tomcat, Git
Languages
Go, Python, Java, Groovy, Bash, PHP, Ruby
Paradigms
Agile Software Development, Test-driven Development (TDD)
Platforms
Android, Google App Engine, Firebase, Linux, Google Cloud Platform (GCP), iOS, AWS Lambda, Heroku
Storage
Google Cloud, MySQL, Amazon S3 (AWS S3), Amazon DynamoDB, Memcached, IBM Db2, Microsoft SQL Server
Frameworks
Spring, Apache Struts 2, webapp2, React Native
Other
SMS, SMPP, Web Services, AS400, Fintech
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