Igor Stajic
Verified Expert in Engineering
Software Developer
Novi Sad, Vojvodina, Serbia
Toptal member since July 1, 2019
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
Experience
- React - 10 years
- Express.js - 10 years
- HTML - 10 years
- JavaScript - 10 years
- Node.js - 10 years
- REST APIs - 10 years
- TypeScript - 8 years
- Firebase - 6 years
Availability
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
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.
Full-stack JavaScript Developer
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.
Full-stack JavaScript Engineer
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.
Full-stack React/Node.js Developer
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.
Senior Full-stack JavaScript Developer
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.
CTO
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.
Lead Developer
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.
Experience
Home2Market
iCouch
uBegin
Love Wall
Education
Bachelor's Degree (Honors) in Electrical and Computer Engineering
University of Novi Sad, Faculty of Technical Sciences - Novi Sad, Serbia
Certifications
Professional Scrum Master I
Scrum.org
Skills
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, SendGrid
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, Android, iOS, Twilio
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, Leadership, Artificial Intelligence (AI), Cloud Storage, Supabase, 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), General Data Protection Regulation (GDPR), Supabase Auth
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