Nikola Todorovic
Verified Expert in Engineering
Full-stack Developer
Belgrade, Serbia
Toptal member since August 4, 2015
Nikola is an experienced Ruby on Rails developer with over 15 years in software development. He graduated from the best computer science faculty in Serbia. Since then, he's been working on a variety of technologies and companies on projects for the US and EU markets. Nikola has even started his own companies and learned a lot about what is needed for a business to succeed. Currently, his passions are Ruby on Rails, blockchain, and startups.
Portfolio
Experience
- PostgreSQL - 14 years
- JavaScript - 14 years
- Ruby on Rails (RoR) - 11 years
- Full-stack - 10 years
- Ruby - 10 years
- Lean Startups - 4 years
- Oracle PL/SQL - 4 years
- React - 1 year
Availability
Preferred Environment
Sublime Text, Git, Linux, MacOS
The most amazing...
...thing I've built is a payroll algorithm with more than 10,000 bug-free code lines that do payroll for thousands of Serbians at healthcare places.
Work Experience
Software Developer
Innovation Center, Faculty of Mechanical Engineering
- Worked on several projects, some of them pilot projects. The biggest were built for a thermal coal power station in Serbia (TE Kostolac).
- Built one app using Ruby on Rails, PostgreSQL as a database, and React as a front-end framework. The application shows a map of various businesses in Belgrade and a user can filter them, click on a pin on the map, and see all sorts of information.
- Created another app using Ruby on Rails and Oracle as a database. It keeps track of more than 7,000 types of spare parts for all kinds of vehicles and keeps track of which vehicle can use which part. Users are able to edit parts and filter them.
- Wrote procedures in Oracle PL/SQL for one application to calculate the average fuel consumption for excavators, bulldozers, and other vehicles on the open pit.
- Led the entire development process, including talking to the end customers, building functionalities, testing, deployment, and more.
- Gained experience in handling a demanding freelance schedule and workload.
Full-stack Ruby on Rails Developer
Mondial Software
- Worked on a reporting system for a general ledger accounting software.
- Integrated AWS Cognito authentication for login purposes.
- Made reports available in HTML, PDF, and Excel form. PDF was done using LaTeX.
Ruby on Rails Developer
Traveling Spoon (via Toptal)
- Worked in an Agile environment with other team members.
- Implemented many features using Ruby on Rails, Angular, and Backbone.
- Worked with Stripe, PayPal, Mailgun, and Google Maps.
Ruby on Rails Developer
TintManager, LLC (via Toptal)
- Worked on multiple tasks to add new functionalities to the application.
- Made significant improvement in application performances.
- Implemented Handlebars using JSON in a Ruby on Rails application.
- Implemented a multi-tenancy feature within the Ruby on Rails application.
CEO
Phixio
- Developed Phix.io, a startup company, completely by myself.
- Worked on the back end, front end, and deployment.
- Set up payment processing for the company with 2checkout.
- Utilized Cloudinary.com for cloud-based image storage.
- Integrated DigitalOcean for the server hosting platform.
CEO
Warrantly
- Scored a $10,000 investment and joined StartupYard, an accelerator in Prague, Czech Republic.
- Gained new communication skills, pitching for many VCs and angel investors in Prague, Amsterdam, Split, and Belgrade.
- Learned about business development, customer development, and startup metrics; having a great team is a key point for success, and being able to communicate well within the team is a must. Building a product is a rewarding and challenging endeavor.
- Discovered that UX is as important as any other part of building a product, maybe even more important.
- Developed the application itself into a complex solution (Warrant.ly) with v2 currently in progress. It has an API on the back end using Rails, Angular on the front, authentication, authorization, and more.
Software Developer
Deploy, Inc.
- Contributed to two projects, one of which was a complex Android app and the other of which was a Java application for Royal Caribbean International.
- Worked in a team with more than twenty developers, each with a specific assignment.
- Coordinated between the dev team in Serbia and HQ in NYC, working flexible hours to be available during US business hours.
- Learned to work under heavy pressure, despite it also being my first Android experience, since we had a very tight deadline.
Software Developer
Micro Business Solutions
- Worked with .NET projects, gaining valuable insight into those technologies.
- Met and negotiated with domestic clients.
- Worked on some legacy projects from the '90s and saw firsthand the importance of using new technologies to get the job done much faster and cleaner.
- Learned some valuable lessons about carefully choosing a working environment where things that I value, like quality and honesty, are valued by the company as well.
Software Engineer
Faculty of Electrical Engineering
- Created a payroll algorithm with more than 10,000 lines of bug-free code which calculated payrolls for thousands of people at healthcare institutions in Serbia.
- Worked from day one on a project called Moneo (part of HELIANT system) for which the algorithm was developed.
- Worked on the core part of HELIANT system, which represents Electronic Health Record systems (EHRs) designed in Java and is used for monitoring the work of doctors as well as keeping records of patients in these health care institutions.
Experience
Phixio
Warrantly
Member, Mensa International
http://www.mensa.orgEducation
Master's Degree in Computer Engineering
School of Electrical Engineering, University of Belgrade - Belgrade, Serbia
Bachelor's Degree in Computer Engineering
School of Electrical Engineering, University of Belgrade - Belgrade, Serbia
Certifications
Blockchain Academy
Toptal
Skills
Libraries/APIs
Ruby on Rails API, jQuery, Devise, Handlebars, Backbone.js, React, CarrierWave
Tools
Notepad++, RSpec, Git, Microsoft Excel, JBuilder, Sublime Text 3, Sublime Text, Apache, NGINX, Redmine, TortoiseSVN, Subversion (SVN), LaTeX
Languages
HTML, SCSS, CSS, SQL, XML, Ruby, Stored Procedure, PL/pgSQL, JavaScript, HTML5, CoffeeScript, C#, Java
Frameworks
ZURB Foundation, Ruby on Rails (RoR), JSON Web Tokens (JWT), Bootstrap, Bootstrap 3, Factory Girl, Angular, .NET, Spring, Hibernate
Paradigms
Model View Controller (MVC), Object-oriented Programming (OOP), Test-driven Development (TDD), Database Design, Object-oriented Design (OOD), Unit Testing, CRUD, Metaprogramming, Scrum, Agile Software Development, Software Testing, Design Patterns
Platforms
Oracle, DigitalOcean, Linux, Blockchain, MacOS, Windows, Windows Mobile, Android
Storage
PostgreSQL, PL/SQL Developer, JSON, Oracle 11g, Oracle PL/SQL, PSQL, SQLite, Redis, Microsoft SQL Server
Industry Expertise
Project Management
Other
Full-stack, APIs, Software Architecture, Lean Startups, Lean Development, Hash, Ajax, Minimum Viable Product (MVP), Back-end, Web Development, Cloudinary, CanCan, Front-end, Product Development, Payment Gateways, Retrieval-augmented Generation (RAG), AI Agents
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring