Luka Blažecki, Developer in Zagreb, Croatia
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Luka Blažecki

Verified Expert  in Engineering

Software Developer

Zagreb, Croatia
Toptal Member Since
September 12, 2015

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.


Rimac Automobili
Amazon Web Services (AWS), Protobuf, Apache Kafka, InfluxDB, PostgreSQL...
Amazon Web Services (AWS), PostgreSQL, GraphQL, Node.js
Amazon Web Services (AWS), PostgreSQL, Node.js




Preferred Environment

GitHub, WebStorm

The most amazing...

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

Work Experience

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: Amazon Web Services (AWS), Protobuf, Apache Kafka, InfluxDB, PostgreSQL, TypeScript, GraphQL, 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: Amazon Web Services (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: Amazon Web Services (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

Node.js APNs Driver

The project involved building a Node.js module for sending notifications via Apple Push Notification service (APNs). Some main advantages include obtaining quick delivery reports after the last notification is sent, a more streamlined sending process, the ability to send bulk messages, and simplicity of use.

Because of the slow and unreliable modules, I created, tested, and put in production a new one. This module uses the APNs error report to find the last notification sent and thus confirm the reception of all prior notifications.


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


Express.js, Grails, AngularJS


Node.js, Protobuf


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


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


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


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

2011 - 2013

Master of Science in Computing Degree in Software Engineering and Information Systems

University of Zagreb Faculty of Electrical Engineering and Computing - Zagreb

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