Sándor Rakonczai, Developer in Budapest, Hungary
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Sándor Rakonczai

Verified Expert  in Engineering

Full-stack Developer

Budapest, Hungary
Toptal Member Since
December 17, 2021

Sandor fell in love with web development as a child and has been passionately involved since. He has extensive training from Morgan Stanley on financial technology and specializes in modern, full-stack applications. He excels with React and has been a fan of the framework since its inception. He built a custom CRM for the Hungarian Film Academy, reworked the ID verification workflow at Wise, and received an award at Morgan Stanley for a presentation outlining an optimized business solution.


JavaScript, TypeScript, React, Gatsby, Storybook, Figma, Styled-components...
Java, JavaScript, Fintech, Web Development, Slack, MacOS, Git, Docker...
Morgan Stanley
Python, JavaScript, Web Development, Git, Automation, Linux, Angular, Bash...




Preferred Environment

MacOS, Visual Studio Code (VS Code), Slack, Google Meet, TypeScript, React, Git, Node.js

The most amazing...

...tool I've built is AgroSense, an IoT project that helps agricultural organizations monitor crops and lands remotely and be alerted for anomalies.

Work Experience

Co-owner and Lead Developer

2020 - PRESENT
  • Delivered design systems according to the Atomic Design methodology and respective web applications to a steadily growing number of SMEs.
  • Designed the TypeScript and React application architecture that became the company standard based on client feedback.
  • Led a team of developers doing code reviews to achieve maintainable and high-quality code.
Technologies: JavaScript, TypeScript, React, Gatsby, Storybook, Figma, Styled-components, GraphQL, Strapi, REST APIs, Git

Full-stack Product Engineer

2019 - PRESENT
  • Replaced a monolithic application written in PHP used for financial crime prevention with a React-based application.
  • Delivered an appealing customer-facing application after many deactivation occurrences. Before that, we used emails to ask for the required information.
  • Participated in reworking the ID verification workflow to increase conversion rate and prevent people from using possibly fake proof of identities.
  • Developed new and improved time complexity for existing machine learning model feature calculations.
  • Implemented new data-gathering and prediction pipelines to exceed our KPI targets year after year despite the company's exponential growth.
Technologies: Java, JavaScript, Fintech, Web Development, Slack, MacOS, Git, Docker, Spring Boot, Apache Kafka, Automation, Angular, TypeScript, React, Bash, Functional Programming, Node.js, Next.js, SaaS, Platform as a Service (PaaS), REST APIs, MongoDB, PostgreSQL, MySQL, MariaDB

Technology Associate

2017 - 2019
Morgan Stanley
  • Integrated many third-party services into a business unit-wide platform written in Python.
  • Improved the user experience by tackling slowdowns or jump arounds.
  • Delivered a data source agnostic domain-specific language for defining forms where fields can have a dependency on each other.
Technologies: Python, JavaScript, Web Development, Git, Automation, Linux, Angular, Bash, Platform as a Service (PaaS), REST APIs, MongoDB, Elasticsearch

Technology Analyst

2017 - 2017
Morgan Stanley
  • Assisted other teams with their front-end efficiency problems.
  • Delivered a solution from scratch for a real business problem as a team of three in just four weeks.
  • Awarded the Most Creative Person certificate for our project presentation.
Technologies: Linux, Java, Python, TypeScript, Web Development, Git, Angular, Bash, Spring Boot, REST APIs

Technology Intern

2016 - 2017
Morgan Stanley
  • Developed tens of new features resulting in an efficiency increase of the operations people.
  • Tracked, documented, and fixed various bugs.
  • Split the inherited codebase into parts to clearly understand it and propose changes regarding efficiency and need.
Technologies: JavaScript, Web Development, Git, Linux, Bash

Qatar Football Association Rebrand

The Qatar Football Association is the governing body of football in Qatar.

In preparation for the 2022 FIFA World Cup, we rebranded their web and mobile applications presence with our renowned atomic design system.

V-GO Apps

V-GO is a program of a non-profit governmental organization to educate children aged between 6-18 about various energy sources and climate change-related issues.

I created a mobile application for iOS and Android using a platform-independent framework called Expo, built around the React Native ecosystem. Later, the requirements changed, and I had to provide a web-optimized layout for the app as well.

Custom CRM for the Hungarian Film Academy

The Hungarian Film Academy is an association of actors, producers, and directors.

I was in charge of creating the user interface for an internal application that helps them account for the royalty payment of a given rights owner.


AgroSense is an IoT project to help agricultural organizations monitor their crops and lands remotely and be alerted for various anomalies in the data stream.

For example, there is a device that takes multiple pictures per day of a pheromone-infused paper. Users are responsible for marking the appearing pests, and then the software provides trend-based alerts about needed intervention.

Internal Monitoring Tool for BalaSys IT

BalaSys IT is a Hungarian firm that provides various services around IT security.

Their requirement was an internal application that they could sell to their clients to monitor an already existing software solution for access logs.
2013 - 2017

Bachelor's Degree in Computer Science

Eotvos Lorand University - Budapest, Hungary


Technology Analyst Program

Morgan Stanley


React, Node.js, REST APIs


Git, Expo, Slack, Figma


JavaScript, Java, Python, TypeScript, Bash, GraphQL


Automation, Functional Programming


Visual Studio Code (VS Code), MacOS, Linux, Apache Kafka, Docker, Firebase


MongoDB, PostgreSQL, MySQL, MariaDB, Elasticsearch


Spring Boot, Next.js, React Native, Angular


Web Development, Fintech, SaaS, Platform as a Service (PaaS), Google Meet, Gatsby, Storybook, Styled-components, Strapi

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