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Šime Buljac
Verified Expert in Engineering
Full-stack Developer
Split, Croatia
Toptal member since November 24, 2015
Bio
Šime is an experienced full-stack developer with over 10 years of expertise under his belt. With a love for trying out the latest and greatest technologies, he always pushes the boundaries of what is possible. Šime is highly flexible and feels equally comfortable working solo or as part of a team.
Portfolio
BBC Scotland(via Blockincrement)
TypeScript, JavaScript, Amazon Web Services (AWS), AWS Lambda...
Iotexpad
Solidity, TypeScript, Amazon Web Services (AWS), Blockchain, Ethereum...
Paragen
Solidity, TypeScript, Blockchain, Ethereum, Blockchain & Cryptocurrency...
Experience
- Node.js - 7 years
- JavaScript - 6 years
- RESTful Development - 6 years
- REST APIs - 6 years
- Solidity - 3 years
- Blockchain - 3 years
- MongoDB - 3 years
- React - 1 year
Work Experience
Back-end Developer
2022 - 2022
BBC Scotland(via Blockincrement)
- Developed logic for AWS Lambda that syncs data fetched from external APIs to an in-house database in previously specified time periods.
- Researched the best approach for implementing solutions via serverless architecture.
- Built and updated serverless framework configuration and deployment files for seamless continuous integration and delivery.
Technologies: TypeScript, JavaScript, Amazon Web Services (AWS), AWS Lambda, Serverless Framework, Serverless Architecture, Serverless, Node.js, AWS Command Line Interface (CLI), Back-end, Lambda Functions, Amazon DynamoDB
Smart Contract and Back-end Developer
2021 - 2022
Iotexpad
- Contributed to developing, testing, and deploying various smart contracts required for the dApp.
- Oversaw initial launchpads and wrote automatization scripts.
- Built a back-end API server from AWS as an optimization/caching layer for the dApp.
Technologies: Solidity, TypeScript, Amazon Web Services (AWS), Blockchain, Ethereum, Blockchain & Cryptocurrency, Ethereum Smart Contracts, Smart Contracts, Next.js, JavaScript, MetaMask, Ethers.js, Back-end, APIs, API Development, Token Design, Web3
Smart Contract and Back-end Developer
2021 - 2022
Paragen
- Developed and deployed staking and launchpad smart contracts.
- Deployed the claiming portal and vesting smart contract.
- Wrote the automatization script, including snapshotting and deploying.
Technologies: Solidity, TypeScript, Blockchain, Ethereum, Blockchain & Cryptocurrency, Ethereum Smart Contracts, Smart Contracts, Next.js, JavaScript, MetaMask, Ethers.js, Back-end, APIs, API Development, Token Design, Web3
Full-stack Developer
2018 - 2021
Honu Hr/Sora (via Toptal)
- Set up and refactored a large part of the project for an incoming MVP release.
- Developed staging and production infrastructure on AWS.
- Worked on continuous integration and deployment process.
Technologies: Amazon Web Services (AWS), Terraform, PostgreSQL, Redis, React, GraphQL, Express.js, Node.js, SQL, JavaScript, Back-end, Sequelize, API Integration, Front-end, Full-stack, APIs, API Development, WebSockets, Databases, DevOps, SysOps, CI/CD Pipelines
Smart Contract and Back-end Developer
2020 - 2020
Greenpower
- Developed a system that allows users token migration from GreenPower (fork of Bitshare) blockchain to Ethereum by monitoring token burn process on one chain and then minting new tokens on Ethereum.
- Worked on deploying ERC20 smart contract and contract for batch distribution of ERC20 tokens.
- Set up everything required on AWS for smooth/secure migration.
Technologies: Solidity, Blockchain, Ethereum, Blockchain & Cryptocurrency, JavaScript, MetaMask, Token Design, Truffle, Ganache, Ganache CLI
Back-end/DevOps Engineer
2016 - 2018
Roomi
- Integrated various third-party services (SendGrid, Evident, Sift Science, Twilio, Facebook, Google Maps, etc.).
- Integrated security monitoring, performance monitoring, and logging services/tools.
- Diagnosed and optimized part of the app with performance issues to prepare it for a global scale.
Technologies: Amazon Web Services (AWS), React, AngularJS, RESTful Development, REST APIs, Cloudflare, Docker, Ansible, Terraform, Redshift, Redis, Elasticsearch, MongoDB, Express.js, Node.js, SQL, JavaScript, Back-end, APIs, API Development, Data Queries, Databases, DevOps, SysOps, Analytics, CI/CD Pipelines
Full-stack Developer
2016 - 2017
Rhinogram (via Toptal)
- Worked on the development of a HIPAA-compliant telehealth platform that enables a better patient experience by making remote healthcare possible, simplifying communication, and minimizing interruptions with real-time, text-based patient engagement.
- Refactored front-end part of the application in Angular.
- Refactored back-end part of the application in Node.js/Express.
Technologies: Amazon Web Services (AWS), Heroku, React, Angular, MySQL, CouchDB, Node.js, SQL, JavaScript, Back-end, Front-end, Full-stack, APIs, API Development
Web Developer
2012 - 2015
MORH
- Helped design and develop new features.
- Wrote unit and E2E tests.
- Developed a responsive AngularJS application.
- Wrote scripts for the automation of system maintenance tasks.
- Made several performance optimizations to existing code.
Technologies: Socket.IO, Mongoose, MongoDB, Angular Material, CSS, HTML, JavaScript, AngularJS, Express.js, Node.js
Software Developer
2009 - 2012
MORH
- Improved old features and created new ones.
- Fixed bugs on the existing code.
- Wrote technical documentation.
- Handled system and network administration.
- Mentored new team members.
Technologies: CSS, jQuery, HTML, JavaScript, PostgreSQL, Hibernate, Java
Project History
Sora
Onboarding for growing teams.
Roomiapp
A mobile platform that helps people find a flexible, affordable co-living solution.
Rhinogram
https://app.rhinogram.com/loginRhinogram’s HIPAA-compliant, telehealth platform enables a better patient experience by making remote healthcare possible, simplifying communication and minimizing interruptions with real-time, text-based patient engagement–with no patient app to download.
Live Air Picture Distribution
Web application for distribution of a joint air picture, used by different units across the whole organization.
The application was wholly built on MEAN stack. I was included in all project development phases from the initial application architecture design and managing the development team to the implementation itself.
The application was wholly built on MEAN stack. I was included in all project development phases from the initial application architecture design and managing the development team to the implementation itself.
Near Real-time Tracking System
Originator and participant in almost all project development phases of the project for position tracking. The system ensures that data is collected from different sources (GPS, radar, open source) establishing a unique database (PostgreSQL, Hibernate ORM). The system is designed using client-server architecture, with the possibility for the client to manipulate tracked data and with an automatic correlation system that ensures unique identification of data tracked from different sources.
Remote Radio Control System
An application for centralized remote control and administration of multiple radio transceivers (also enabled transceiver to communicate mutually). As a part of the small team, I was included in all parts of development and testing.
Education
2003 - 2009
Master's Degree in Computing (Software Engineering)
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB) - Split
Certifications
OCTOBER 2022 - OCTOBER 2025
AWS Certified Developer - Associate
Amazon Web Services (AWS)
JUNE 2018 - PRESENT
Toptal Blockchain Academy
Toptal Academy
Skills
Libraries/APIs
REST APIs, Node.js, Lodash, React, API Development, Socket.IO, jQuery
Tools
IntelliJ IDEA, Vim Text Editor, React Apollo, Sequelize, Git, Mongoose, Ansible, Terraform, MetaMask, AWS Command Line Interface (CLI), Ganache, Ganache CLI
Languages
ECMAScript (ES6), JavaScript, TypeScript, Solidity, GraphQL, HTML, CSS, SQL, HTML5, Java
Frameworks
Express.js, AngularJS, Hibernate, Angular Material, Angular, Next.js, Serverless Framework, Truffle
Paradigms
RESTful Development, Object-oriented Programming (OOP), Unit Testing, Functional Programming, DevOps, Serverless Architecture
Storage
MongoDB, Redis, Elasticsearch, PostgreSQL, MySQL, Redis Cache, Amazon S3 (AWS S3), CouchDB, Redshift, Amazon DynamoDB, Databases
Platforms
Amazon Web Services (AWS), Blockchain, Ethereum, Linux, MacOS, Heroku, Docker, AWS Elastic Beanstalk, AWS Lambda, Visual Studio Code (VS Code)
Other
Back-end, Apollo, Apollo Server, Blockchain & Cryptocurrency, APIs, Cloudflare, Amazon Route 53, Ethereum Smart Contracts, Smart Contracts, Ethers.js, Serverless, Code Deployment, Codebase Development, AWS Certified Developer, Lambda Functions, API Integration, Front-end, Full-stack, Token Design, WebSockets, Web3, Data Queries, SysOps, Analytics, CI/CD Pipelines
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