Igor Stajic, Developer in Novi Sad, Vojvodina, Serbia
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Igor Stajic

Verified Expert  in Engineering

Bio

Igor is an experienced freelancer with over nine years of experience working with JavaScript/TypeScript and has perfected his skills. Lately, he's been focusing on React, Node.js, and Express.js. Igor can build any project from the ground up and is known for writing well-designed, testable, and efficient code using best practices. Igor is a hardworking, responsible professional who can work independently and in teams.

Portfolio

Pfizer
React, Front-end, TypeScript, Node.js, REST APIs, Git, Jira, Bitbucket, Jest...
Freelance
Node.js, React Native, React, Ember.js, JavaScript, GraphQL, MySQL, PostgreSQL...
Hartree Works LTD
React, Firebase, RSS Feeds, XML, Podcasting, Chrome Extensions, Node.js, HTML...

Experience

React - 10 yearsExpress.js - 10 yearsHTML - 10 yearsJavaScript - 10 yearsNode.js - 10 yearsREST APIs - 10 yearsTypeScript - 8 yearsFirebase - 6 years

Availability

Part-time

Preferred Environment

MacOS, Visual Studio Code (VS Code)

The most amazing...

...project I've worked on is the digitization of site intelligence processes for Pfizer.

Work Experience

Senior React Developer

2020 - PRESENT
Pfizer
  • Digitized the site intelligence and selection workflow by building a streamlined web-based application, replacing the previous manual Excel-based process.
  • Architected and built a React application from scratch using MUI.
  • Worked in a team with other Toptal developers. Used Jira for task management and sprint tracking.
Technologies: React, Front-end, TypeScript, Node.js, REST APIs, Git, Jira, Bitbucket, Jest, Material UI, HTML, ECMAScript (ES6), JSX, Code Review, Source Code Review, Web Development, REST, HTML5, CSS, JSON, Chrome Developer Tools, Responsive UI, Architecture, CI/CD Pipelines, MERN Stack, CTO, NPM, Maps, OpenAI, AWS Lambda, Serverless, DevOps, Storybook, Application State Management, Responsive Web Apps, React Redux, GitHub, Vite, NGINX, Software Architecture, Testing, Automated Testing, UI Testing

Full-stack JavaScript Developer

2016 - PRESENT
Freelance
  • Contributed to many projects using React, Ember.js, and Node.js.
  • Worked mostly with startups, in small teams, and involved in all of the project lifecycle phases.
  • Architected and developed complex solutions using both NoSQL and SQL databases.
  • Integrated and worked with many third-party API services like Stripe, Algolia, Intercom, Zendesk, FirstPromoter, social network APIs, and more.
  • Used both the AWS and Google Cloud Platforms.
Technologies: Node.js, React Native, React, Ember.js, JavaScript, GraphQL, MySQL, PostgreSQL, Firebase, MongoDB, TypeScript, Google Cloud Platform (GCP), Amazon Web Services (AWS), Git, REST APIs, REST, Figma, Full-stack, Full-stack Development, HTML, ECMAScript (ES6), JSX, Web Development, Firebase Realtime Database, HTML5, CSS, JSON, Chrome Developer Tools, Responsive UI, Stripe API, SQL, Stripe, Electron, APIs, Architecture, Tailwind CSS, Vercel, Prisma, Google Cloud, Auth0, NPM, Startups, Minimum Viable Product (MVP), OpenAI, AWS Lambda, Serverless, Amazon DynamoDB, HIPAA Compliance, HIPAA Electronic Data Interchange (EDI), GDPR, DevOps, Storybook, Application State Management, Responsive Web Apps, GitHub, NestJS, Cloud Firestore, Redux, NGINX, Software Architecture, Automated Testing, UI Testing

Full-stack JavaScript Engineer

2022 - 2022
Hartree Works LTD
  • Built a Node.js API MVP for manipulating RSS feeds.
  • Built a Chrome extension MVP for reading and manipulating Google Calendar data.
  • Worked and communicated directly with the founder on defining the features and architecting solutions based on ideas.
Technologies: React, Firebase, RSS Feeds, XML, Podcasting, Chrome Extensions, Node.js, HTML, ECMAScript (ES6), JSX, Full-stack, Full-stack Development, Web Development, Firebase Realtime Database, REST, HTML5, CSS, JSON, Chrome Developer Tools, Responsive UI, APIs, Architecture, Tailwind CSS, Vercel, CI/CD Pipelines, MERN Stack, NPM, Startups, Minimum Viable Product (MVP), Serverless, DevOps, GitHub, NestJS, Redux, Software Architecture, Testing

Full-stack React/Node.js Developer

2021 - 2022
Talis Protocol
  • Worked on new features and bug fixes on a React application's existing front end (Next.js).
  • Migrated a Node.js API and GraphQL resolvers from using DynamoDB to MongoDB with Mongoose.
  • Built migration scripts for transfers from different third-party API providers.
Technologies: React, Next.js, Node.js, TypeScript, JavaScript, Amazon Web Services (AWS), GraphQL, MongoDB, Mongoose, Full-stack, Full-stack Development, Material UI, HTML, ECMAScript (ES6), JSX, Web Development, REST, HTML5, CSS, JSON, Chrome Developer Tools, Responsive UI, APIs, Architecture, Prisma, MERN Stack, AWS Amplify, NPM, Startups, Minimum Viable Product (MVP), Responsive Web Apps, GitHub, Redux

Senior Full-stack JavaScript Developer

2019 - 2020
Support.com
  • Worked as part of the core development team on the main SaaS product.
  • Designed and developed integrations with complementary third-party systems using OneTrust, HubSpot, and Twilio.
  • Developed data migration scripts for different external systems, importing over 100k user records.
  • Worked in a fully remote team, interfacing with QA, UX, product design, and DevOps teams.
  • Performed design and code reviews, shared knowledge, and contributed to system architecture design decisions.
  • Worked on implementing unit and functional testing.
Technologies: Redis, PostgreSQL, AngularJS, Express.js, Node.js, React, JavaScript, Front-end, User Interface (UI), Website Performance, API Integration, Angular, Twilio API, Material UI, HTML, ECMAScript (ES6), JSX, Code Review, Source Code Review, Web Development, REST, HTML5, CSS, JSON, Chrome Developer Tools, APIs, Architecture, MERN Stack, NPM, GDPR, Responsive Web Apps, Testing

CTO

2018 - 2020
Home2Market
  • Worked on rewriting and redesigning a web SaaS platform called Home2Market.
  • Architected and built the back end using Node.js, Restify, and Firebase.
  • Implemented many SaaS platform-related features and worked on integrating multiple third-party APIs.
  • Architected and built a web application using React and Node.js.
  • Implemented a new design and many features needed for the SaaS platform that real estate agents used to manage and market their listings.
  • Committed to all stages of the development for an enterprise-grade platform—from developing an MVP, reviewing the UI designs, technology choices, getting it ready to release, releasing the platform, and maintaining it.
  • Hired and managed two external contractors for some short-term work, supervising their work and performing code reviews.
Technologies: Firebase, Node.js, React, JavaScript, User Interface (UI), Website Performance, GraphQL, API Integration, Amazon Web Services (AWS), REST APIs, Material UI, HTML, ECMAScript (ES6), JSX, Full-stack, Full-stack Development, Code Review, Source Code Review, Web Development, Firebase Realtime Database, REST, HTML5, CSS, JSON, Chrome Developer Tools, Responsive UI, Stripe API, SQL, Stripe, Architecture, CI/CD Pipelines, MERN Stack, CTO, NPM, Maps, Startups, Minimum Viable Product (MVP), DevOps, Responsive Web Apps, GitHub, Software Architecture

Lead Developer

2014 - 2016
TMNS Serbia (now Devoteam)
  • Built a SaaS product's front end, from the ground up, using Ember.js.
  • Worked with other team members, provided guidance, and helped them out when they were stuck.
  • Conducted code reviews and enforced coding standards and best practices.
  • Introduced junior developers to the Ember.js framework.
  • Worked with product owners on defining the roadmap and breaking down user stories.
  • Converted an existing AngularJS application to Ember.js.
  • Grew the team from two developers to two front-end team of 2-3 developers, and built the back-end team over a two-year period, interviewing and hiring people as we expanded. I was the development lead and managed both front-end teams at the end.
Technologies: Ember.js, JavaScript, HTML, ECMAScript (ES6), Full-stack, Full-stack Development, Code Review, Source Code Review, Web Development, REST, HTML5, CSS, Linux, JSON, Hiring, Architecture, Python, NPM, Maps, Startups, DevOps, Software Architecture

Home2Market

Home2Market is a SaaS platform used by real estate professionals in the US to help them manage and market their listings. I've contributed to building the platform from scratch, working directly with the founder.

iCouch

https://icouch.me
iCouch is an application that offers secure video, scheduling, client, and document management.

uBegin

uBegin is an online platform that allows people to learn, engage, and celebrate the collective action for 2030 sustainable development goals. It unifies an online social environment with tools for project collaboration and matching resources to project needs.

Love Wall

A mobile app that allows users to leave digital love messages on different locations, send "locked" messages to other users and rate places as more or less romantic.
2009 - 2014

Bachelor's Degree (Honors) in Electrical and Computer Engineering

University of Novi Sad, Faculty of Technical Sciences - Novi Sad, Serbia

MAY 2016 - PRESENT

Professional Scrum Master I

Scrum.org

Libraries/APIs

React, Node.js, React Redux, REST APIs, jQuery, Stripe, Stripe API, Twilio API, AWS Amplify

Tools

GitHub, JSX, NPM, Git, NGINX, Chrome Developer Tools, Auth0, Flow, Jira, Webpack, Docker Compose, GitLab, Bamboo, Trello, GitLab CI/CD, Bitbucket, Figma, Mongoose, Prisma

Languages

TypeScript, JavaScript, HTML5, ECMAScript (ES6), HTML, SQL, GraphQL, CSS, ES7, Sass, SCSS, Less, XML, Python

Frameworks

Next.js, Ember.js, Express.js, Material UI, React Native, Redux, Bootstrap, Jest, Tailwind CSS, NestJS, AngularJS, Angular, React-Bootstrap, Electron

Platforms

Firebase, Amazon Web Services (AWS), Visual Studio Code (VS Code), Linux, Google Cloud Platform (GCP), Vercel, AWS Lambda, Docker, MacOS, Heroku

Storage

Firebase Realtime Database, PostgreSQL, MongoDB, MySQL, JSON, Redis, Elasticsearch, Cloud Firestore, Databases, Google Cloud, Amazon DynamoDB

Paradigms

REST, Scrum, Testing, Automated Testing, Model View Controller (MVC), Functional Programming, HIPAA Compliance, DevOps

Other

Minimum Viable Product (MVP), Front-end, Full-stack, Full-stack Development, Code Review, Source Code Review, APIs, Architecture, MERN Stack, CTO, Startups, Application State Management, Responsive Web Apps, SaaS, Website Performance, API Integration, Responsive UI, CI/CD Pipelines, Maps, Serverless, Storybook, Vite, Software Architecture, UI Testing, Google Tag Manager, Software as a Service (SaaS), SOLID Principles, ParcelJS, User Interface (UI), Interviewing, Hiring, Computer Science, Software Engineering, Web Development, RSS Feeds, Podcasting, Chrome Extensions, OpenAI, HIPAA Electronic Data Interchange (EDI), GDPR

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