Alex Rossovsky, Developer in Bangkok, Thailand
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Alex Rossovsky

Verified Expert  in Engineering

Python Developer

Bangkok, Thailand
Toptal Member Since
December 1, 2021

Alex is an accomplished full-stack developer with a distinctive edge in computer security and reverse engineering. His expertise spans developing full-stack web applications and mobile applications for Android. Alex's strong problem-solving skills and diverse technical skillset ensure he delivers optimal solutions for even the most intricate challenges.


Docker, Kubernetes, FastAPI, Python, SQLAlchemy, ChatGPT...
Docker, OpenAI GPT-4 API, Data Analysis, Algorithms, Reverse Engineering...
Rollee SaS
Mobile Apps, Reverse Engineering, APIs, Algorithms, Python, Documentation, ARM...




Preferred Environment

PyCharm, Vim Text Editor, Android Studio, VirtualBox, Interactive Disassembler (IDA), Server Security, Automation, Data Scraping

The most amazing...

...project I've worked on is mobile device management (MDM). It's a complex Django server and Android app solution to control 50,000+ devices.

Work Experience

Senior Python Developer

2023 - 2023
  • Defined a microservices architecture and developed an AI-based project.
  • Integrated the ChatGPT Assistants API and a function-call API into company workflows.
  • Developed AI-based browser automation using the Playwright Library.
  • Managed and mentored a small team of back-end and front-end developers.
  • Developed a back end using FastAPI, Python, PostgreSQL, and RabbitMQ.
Technologies: Docker, Kubernetes, FastAPI, Python, SQLAlchemy, ChatGPT, Artificial Intelligence (AI), Asynchronous Programming, Back-end Development, DevOps, Performance Optimization, CI/CD Pipelines, Database Design, Leadership, Containerization, OpenAI Assistants API, OpenAI, Prompt Engineering, Large Language Models (LLMs), API Integration

Senior Full-stack Developer via Toptal

2023 - 2023
  • Developed an instance of ChatGPT, a clone with its own set of features, and integrated it with the company database.
  • Created the project from scratch using Docker, FastAPI, SQLAlchemy, PostgreSQL, and React for the front end.
  • Determined a set of OpenAI and other data analysis APIs for integration.
  • Leveraged ChatGPT function that calls the API to give AI access to company sources of data: databasea, Excel sheets, Google Sheets, and websites via Playwright scripts. Developed a plugin system for each source.
  • Developed a custom code interpreter plugin for automating company workflows when the CI plugin was not available.
  • Made CI/CD using GitHub Actions to deploy projects to the cloud.
  • Used LlamaIndex and ChatGPT to summarize and store company data.
Technologies: Docker, OpenAI GPT-4 API, Data Analysis, Algorithms, Reverse Engineering, Data Visualization, APIs, FastAPI, React, Cloud, LangChain, Chatbots, Artificial Intelligence (AI), Full-stack, Back-end, Git, OpenAI GPT-3 API, ChatGPT, Python, Asynchronous Programming, Back-end Development, DevOps, Performance Optimization, Database Design, Containerization, OpenAI Assistants API, OpenAI, Prompt Engineering, Large Language Models (LLMs), API Integration

Senior Developer | Reverse Engineer

2023 - 2023
Rollee SaS
  • Reverse-engineered an Android app obfuscated by a commercial tool, Promon.
  • Recovered multiple obfuscated algorithms from native ARM code to Python.
  • Researched API endpoints used by Android apps and created API clients in Python.
Technologies: Mobile Apps, Reverse Engineering, APIs, Algorithms, Python, Documentation, ARM, ARM Assembler, Decompilation, Hex-Rays Decompiler, Android, Cryptography, Git, Back-end Development, API Integration

Python Developer

2022 - 2022
US Shipping Company
  • Worked as part of a team to switch the whole company from Python 2 to Python 3.
  • Fixed code for migrating to the newest Django and Python.
  • Corrected CircleCI jobs to support the deployment process for the new Python 3 environment.
  • Fixed many deployment issues related to Kubernetes cluster deployment and the new Python 3 environment.
  • Created Python scripts to perform stress testing to measure the performance of the new Python 3 environment against Python 2.
  • Developed scripts to identify blind points and bugs not covered by automatic tests.
Technologies: Python, Django, Kubernetes, Docker, Stress Testing, CircleCI, Android API, Cloud, Full-stack, Back-end, Git, Back-end Development, DevOps, Performance Optimization, CI/CD Pipelines, Database Design, Containerization, API Integration

Senior Full-stack Flutter Developer

2021 - 2022
  • Built an Android app that communicates with specific Bluetooth earbuds collecting data to derive insights about sleep, seizures, and other clinical cases.
  • Developed the native part in Java and Flutter for UI (as a module over the native app).
  • Created the back-end part in pure Python to act as a scheduler for time-critical push notifications and database manager.
  • Converted multiple designed pages from Figma to Flutter.
  • Developed an emulator that allowed to work on the UI part without having the actual device.
Technologies: Flutter, Cloud Firestore, Python, Docker, Android, Google Cloud Platform (GCP), SQL, Python 3, SSH, Cloud, Full-stack, Back-end, Git, Back-end Development, Containerization, API Integration

Full-stack Flutter and Back-end Developer

2020 - 2021
  • Developed a Flutter app for a big dental company that helps users learn about their healing progress and interact with clinics.
  • Built the back end for an app using Django framework and integration with the internal company database, 1C:Enterprise.
  • Developed an admin panel for app-specific features such as interaction with the user via messages.
Technologies: Flutter, Android, iOS, Django, Python, REST APIs, PostgreSQL, Dart, Mobile, Architecture, Technical Leadership, Mobile Development, CSS, Bash, SQL, Python 3, Django REST Framework, SSH, Full-stack, Back-end, Git, Back-end Development, DevOps, Performance Optimization, Database Design, Containerization, API Integration

Full-stack Developer

2015 - 2021
  • Developed an MDM solution with full use of Android features and back end written in Python and Django.
  • Made Windows-based software for a remote firmware update with the use of Qt framework with Django server as the back end.
  • Built Android apps for different purposes based on customer requirements.
  • Managed and deployed back-end software on multiple Linux servers at DigitalOcean with features for different customers.
  • Reverse-engineered multiple Android and Windows applications and researched USB and TCP-based protocols using Wireshark.
  • Managed a small team of back-end and Android developers.
Technologies: Java, Kotlin, Qt 4, C, Django, Python, DigitalOcean, Linux, REST APIs, Architecture, Mobile Development, HTML, CSS, Bash, WebView, SQL, Python 3, Django REST Framework, SSH, Cryptography, Full-stack, Back-end, Back-end Development, DevOps, API Integration, Amazon Web Services (AWS)

Full-stack Developer

2014 - 2015
  • Developed a front-end app using Backbone.js and Marionette and a back end using Yii PHP framework for a cinema production company.
  • Managed the development process for both back end and mobile. Developed small parts of the iOS application.
  • Developed architecture for offline synchronization between the iOS device and back end for customers with poor internet connection during the production process.
Technologies: JavaScript, PHP, Backbone.js, Yii, Linux, REST APIs, Architecture, Mobile Development, HTML, CSS, Bash, SQL, Python 3, SSH, Android API, Cryptography, Full-stack, Firmware, Back-end, Python, Back-end Development

Reverse Engineer and Software Developer

2010 - 2014
Telecommunications Security Company
  • Reverse-engineered C, ARM, and Java mobile apps with the help of IDA debugger.
  • Researched and developed applications and baseband stack working with GSM protocol (3GPP specs). Developed baseband and Linux Kernel modules in pure C.
  • Debugged apps using hardware debugger (JTAG) and worked with hardware and baseband processor DSP.
  • Developed different apps for Android, using low-level libraries written in C.
Technologies: C, C++, ARM Embedded, Linux, Windows Mobile, Android, JTAG, Reverse Engineering, Mobile, Architecture, Mobile Development, CSS, Bash, WebView, Android API, Cryptography, Firmware, Back-end, Python, Performance Optimization, Database Design

Full-stack Developer

2009 - 2012
Translation Agency
  • Developed software for tracking orders, translators, customers, and payment calculations.
  • Deployed the project as a Windows-based server using MAMP stack.
  • Assured that the server worked at production for more than ten years, as the customers reported.
Technologies: JavaScript, Yii, PHP, MySQL, Architecture, HTML, CSS, Full-stack

Mobile Device Management Solution for Samsung Phones

MDM solution with full use of Android features and a back end written in Django (Python).

The solution consists of two main parts:

• The Django-based back end acts as a server for device enrollment, management of device policies, and remote application installation.
• The Android application, written in Java, is the client app for performing server-controlled actions and utilizing features of MDM (Samsung Knox)

Dental Care Management App
Full-stack Flutter and Django back-end app helping customers of a dental company to track their progress in healing, see their expenses, and communicate with clinic administration. The most challenging process was integrating the existing database and passing data into the Flutter app, which was solved by developing a middle service written in Django.

Firmware Flashing Solution

A remote software flashing tool used to update firmware on Qualcomm and MTK-based mobile phones and it consists of a Windows tool written in Qt 4 framework (C++) and Django back end (Python) to track software update states.

The Windows tool used low-level serial communication via com port and protocols acquired by reverse-engineering existing flashing tools (x86) and device software (ARM).

The Django back end was used to build and store different firmware depending on customer requirements. The firmware was then downloaded by Windows tool and flashed to phones.

Smart Home Automation App

Worked on Flutter Android and iOS app for smart home automation system built on top of Home Assistant. Improved the existing system architecture and team development environment. Implemented integration for different kinds of smart home devices.

Brain Conditions Monitoring App

Developed an Android app with Flutter UI that communicates with a Bluetooth device to monitor and collect EEG data from the brain and notify users about different clinical studies. Developed the back end on Python to handle database-specific tasks and serve time-critical push notifications to users' smartphones.
2006 - 2012

Engineer's Degree in Computer Science

Peter the Great St. Petersburg Polytechnic University - Saint Petersburg, Russia


Android API, REST APIs, Playwright, OpenAI Assistants API, Backbone.js, Vue, React, SQLAlchemy


Vim Text Editor, Git, PyCharm, WebView, Figma, ChatGPT, Android Studio, VirtualBox, Interactive Disassembler (IDA), Celery, CircleCI


Django, Qt, Flutter, Django REST Framework, Yii, Flask


C, Python, Bash, JavaScript, C++, Java, Dart, CSS, HTML, Embedded C, SQL, Python 3, PHP, Kotlin, ARM Assembler, TypeScript


Automation, Mobile Development, REST, Microservices, Asynchronous Programming, DevOps, Database Design, Stress Testing, Real-time Systems


Linux, Android, Mobile, Embedded Linux, Docker, Firebase, Windows Mobile, DigitalOcean, iOS, Google Cloud Platform (GCP), Kubernetes, Amazon Web Services (AWS)


MySQL, PostgreSQL, Cloud Firestore


Software Development, Reverse Engineering, APIs, Web Scraping, Architecture, SSH, Cryptography, Cloud, Chatbots, Full-stack Development, Full-stack, Firmware, Web Development, Back-end, Back-end Development, Proxies, API Integration, ARM Embedded, Qt 4, Wireless Protocols, Minimum Viable Product (MVP), Technical Leadership, Internet of Things (IoT), Embedded Systems, Embedded Development, Documentation, Telegram Bots, Data Scraping, OpenAI, OpenAI GPT-4 API, FastAPI, Artificial Intelligence (AI), Cloudflare, OpenAI GPT-3 API, Graphical User Interface (GUI), Browser Automation, Performance Optimization, Containerization, Prompt Engineering, Large Language Models (LLMs), Computer Security, JTAG, MDM, ARM, Mobile Apps, Algorithms, Decompilation, Hex-Rays Decompiler, Data Analysis, Data Visualization, LangChain, Server Security, CI/CD Pipelines, Leadership

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