Luka Blažecki, Software Developer in Zagreb, Croatia
Luka Blažecki

Software Developer in Zagreb, Croatia

Member since September 16, 2014
Luka is a team leader and software engineer focused on building back-end solutions with infrastructure integrations. With a professional experience of more then six years, he's fluent with Node.js, SQL, and NoSQL databases as well as AWS. Achieving great solutions for him means building a great team with standardized procedures like PR-s, CI/CD, testing, linting, and immutable deployment.
Luka is now available for hire


  • Rimac Automobili
    Protobuf, Apache Kafka, InfluxDB, PostgreSQL, TypeScript, GraphQL, AWS, Java...
  • KidzToPros
    AWS, PostgreSQL, GraphQL, Node.js
  • IvySpace
    AWS, PostgreSQL, Node.js



Zagreb, Croatia



Preferred Environment

GitHub, WebStorm

The most amazing...

...project I've created is a heavy reliable, highly scalable, queue-based, multi-component Node.js service.


  • Senior Software Engineer/Team Lead

    2018 - PRESENT
    Rimac Automobili
    • Led the rebuild process to a new system based on AWS cloud supporting both mobile and web requirements using GraphQL.
    • Managed the migration of the vehicle to back-end communication from the old proprietary WebSocket protocol to the new MQTT protocol.
    • Build several services written in Java and Node.js/TypeScript.
    Technologies: Protobuf, Apache Kafka, InfluxDB, PostgreSQL, TypeScript, GraphQL, AWS, Java, Node.js
  • Team Lead

    2018 - 2018
    • Led the rebuild process from an older inadequate system to a new that could fulfill clients' needs and business requests.
    • Migrated data from unstructured MongoDB to PostgreSQL.
    • Rewrote the whole API layer to new GraphQL so clients' requirements could be easily extendable.
    Technologies: AWS, PostgreSQL, GraphQL, Node.js
  • Software Developer/Team Lead

    2015 - 2018
    • Worked in a small, remotely-based team that built from scratch to production.
    • Monitored and led new team members on the back end and infrastructure.
    • Built up architecture for the back end with pre-commit hooks for code quality rules (ESLint) and testing (unit and integration).
    • Connected the project to GitHub with continuous integration and testing done on Codeship and AWS. Made a CI/CD infrastructure with end-to-end testing using Selenium.
    • Configured services on AWS like EBS, Routing, Databases (RDS, DynamoDB), and Lambda.
    Technologies: AWS, PostgreSQL, Node.js
  • Software Engineer/Team Leader

    2014 - 2015
    The Hyperactive
    • Led technical initiatives on a client-based startup project.
    • Contributed to various projects, mostly front-end oriented.
    • Set up the architectural design for a medium-sized project and worked it until production.
    • Introduced Agile methodology for organizational purposes (Scrum, JIRA).
    • Developed a company mobile site and various front-end responsive widgets.
    Technologies: Couchbase, AngularJS, Android, Node.js
  • Software Engineer

    2012 - 2014
    • Worked on a back-end part of the system containing of business logic, data stores, and logic for handling communications with mobile libraries and front-end.
    • Deployed and provided administration for the back-end in production.
    • Administered and worked on handling data in MongoDB and Cassandra.
    • Collaborated with a highly motivated team adopting Scrum methodology with two-week sprints.
    • Communicated with clients in an earlier phase of project.
    Technologies: Elasticsearch, Kibana, Grails, Cassandra, Redis, MongoDB, Node.js


  • A Node.js Guide to Actually Doing Integration Tests (Publication)
    Your software isn’t fully tested until you write integration tests for it. While unit tests help ensure that functions are properly written, integration tests help ensure that the system is working properly as a whole. In this article, Toptal Software Engineer Luka Blažecki uses Node.js to explain why integration testing is important for every development platform and how to write clean, composable integration tests.


  • Languages

    JavaScript, SQL, Sass, GraphQL, TypeScript, Java, Bash
  • Frameworks

    Express.js, Grails, AngularJS
  • Libraries/APIs

    Node.js, Protobuf
  • Tools

    Git, Sequelize, Codeship, Mongoose, Jira, IDEA IDE, WebStorm, GitHub, Kibana
  • Platforms

    Amazon Web Services (AWS), Android, Apache Kafka, Unix
  • Paradigms

    Functional Programming, Agile Software Development, Scrum, Test-driven Development (TDD), Continuous Integration (CI), Object-oriented Programming (OOP)
  • Storage

    NoSQL, PostgreSQL, MongoDB, Elasticsearch, Couchbase, InfluxDB, Redis, Cassandra
  • Other



  • Master of Science in Computing degree in Software Engineering and Information Systems
    2011 - 2013
    University of Zagreb Faculty of Electrical Engineering and Computing - Zagreb

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