Andrei is available for hire

Andrei Statescu

Verified Expert in Engineering

Full-stack Developer

Location

Timișoara, Timiș County, Romania

Toptal Member Since

March 18, 2020

Andrei is a senior full-stack developer, former Microsoft and Deliveroo software engineer, reputable freelancer, and founder of DX Software, with 10 years of experience developing web, desktop, and mobile applications using Ruby on Rails, C#, and JavaScript. The software he created brought $10+ million and is used by tens of millions of users. Andrei is here to help companies strengthen their business using the right software and tools.

Algorithms Front-end Back-end Full-stack Web Scraping Data Scraping Integration Mobile App Development Cryptocurrency JSON C#.NET CSS SQL REST APIs HTML5

Portfolio

DX Software

Algorithms, Android, React Native, React, JavaScript, WordPress, PHP, .NET, C#...

Camber Partners Management LLC

Ruby on Rails (RoR), Web Scraping, CAPTCHA, Charting, PostgreSQL, Heroku, APIs...

JG Environmental Ltd

VBScript, SQL, REST APIs, C#, C#.NET, ASP, ASP.NET, Microsoft SQL Server, Teams...

Experience

C#.NET - 9 years Front-end - 9 years Back-end - 9 years JavaScript - 9 years Java - 7 years Ruby on Rails (RoR) - 6 years Python - 5 years Solidity - 2 years

Availability

Part-time

Preferred Environment

Slack, Git, Android Studio, Visual Studio, Eclipse, Atom, Visual Studio Code (VS Code), MacOS, Agile, Microsoft Teams

The most amazing...

...software I've developed is the core of WHS, the US Golf Association's system that computes handicaps for over 10 million golfers worldwide on a daily basis.

Work Experience

Owner and Full-stack Developer

2018 - PRESENT

DX Software

Founded DX Software in 2018 and spearheaded a team of highly skilled developers and designers. Worked closely with the CEOs of small and medium-sized enterprises to devise software solutions to drive their business growth and success.
Created the central system for WHS, used by the US Golf Association to calculate millions of golfers' handicaps worldwide. Used technologies like Ruby on Rails, React, PostgreSQL, and AWS. More info at https:/www.randa.org/WorldHandicapSystem.
Built a personalized access management system for a Fortune 500 German corporation. It used Java and Microservices to coordinate employee permissions seamlessly across multiple tools while improving the company's security.
Created a unique booking website designed as a social platform where guests can reserve accommodations and share their travel stories with friends. The website was developed using React and Ruby on Rails and is hosted on Heroku.
Developed a customized food ordering application for a large office complex in Bucharest, which included several nearby restaurants. The system had a PHP back end, a React Native mobile app, a WordPress website, and integration with an ERP system.
Created ArtekaLabs' blockchain-based NFT collections powered by Ethereum/Polygon solidity and React/Web3.js. Learn more at https://www.artekalabs.com/.
Built a members section for a blockchain startup that enables users to make purchases using their crypto wallet. Our team then converted it into a white-label SaaS using top-of-the-line technologies such as React, Node.js, AWS, and Ethereum.
Led the creation of a mobile app that transformed a mid-sized company's sales team interactions. Our use of React, Node.js, and AWS resulted in up to 20% performance improvement for employees and up to 3% sales increase for the company.

Technologies: Algorithms, Android, React Native, React, JavaScript, WordPress, PHP, .NET, C#, Ruby on Rails (RoR), C#.NET, Python 3, Python, Python 2, SQL, CSS, Java, Architecture, Blockchain, Cryptocurrency, Solidity, Ethereum, Scraping, Back-end, Front-end, HTML, Node.js, Agile, Android Studio, Amazon Web Services (AWS), Docker, PostgreSQL, Figma, Google Cloud Platform (GCP), Firebase, Next.js, Web Scraping, MySQL, HTML5, Artificial Intelligence (AI), iOS, Full-stack, ChatGPT, APIs, Gmail API, OpenAI GPT-3 API, OpenAI GPT-4 API, Security, Mapbox, Tailwind CSS, Drupal, Ghost, Handlebars, Blogging, OpenCart, Visualization, Integration, Sidekiq, Vue, CI/CD Pipelines, Apollo, GraphQL, DevOps, Angular, Azure, Cloud Firestore, Full-stack Development, NoSQL, Technical Leadership, JSON, TypeScript, Jupyter Notebook, AWS Lambda, Amazon EC2, Kotlin, API Development, API Integration, Push Notifications, Mobile App Development, Team Leadership, Azure SQL, WiX, Web3.js, Secure Multi-party Computation, WebAuth, JSON REST APIs, UML, Django, WhatsApp, OpenAI, REST APIs, B2B

Ruby Web App Developer

2020 - 2021

Camber Partners Management LLC

Utilized Ruby on Rails, Heroku, and PostgreSQL to create tools that expertly extracted vital information from the internet. This information empowered our clients to make informed business decisions, saving them millions of dollars.
Ensured that all business requirements were met and deliverables were completed in the appropriate sequence in collaboration with the founder.
Made certain that the DevOps pipeline was managed with the utmost efficiency throughout our partnership. This involved ensuring timely delivery, maintaining streamlined operations during downtimes, and ensuring uninterrupted uptime.

Technologies: Ruby on Rails (RoR), Web Scraping, CAPTCHA, Charting, PostgreSQL, Heroku, APIs, Ruby, MySQL, HTML5, Full-stack, Security, Visualization, Integration, Sidekiq, CI/CD Pipelines, DevOps, Full-stack Development, JSON, API Development, API Integration, JSON REST APIs, REST APIs, B2B

Developer

2020 - 2021

JG Environmental Ltd

Served as a lead developer and worked closely with the CEO to achieve the business objectives. Created top-notch tools that significantly improved user experience and employee performance using C#, .NET, Java, JavaScript, React, and React Native.
Implemented a range of tools to significantly reduce expenses and generate new streams of income for the client. The software was expertly installed on the client's exclusive servers, ensuring seamless operation and maximum efficiency.
Collaborated closely with the operations, finance, and delivery teams to maximize the advantages of the tools I created. Their invaluable input enabled me to improve the software and propel the business to unprecedented levels of success.
Integrated the client's internal software with several external tools such as Google Maps, Google Ads, and Adobe. The result was a seamless real-time solution that automated business decisions with unparalleled success.
Took charge of software maintenance when the previous development team became unavailable and made essential upgrades to the systems. Carried out continuous maintenance and ensured a seamless handover process.

Technologies: VBScript, SQL, REST APIs, C#, C#.NET, ASP, ASP.NET, Microsoft SQL Server, Teams, Google Maps, Google Ads, Algorithms, Java, .NET, Amazon Web Services (AWS), HTML5, Full-stack, APIs, Security, JavaScript, CSS, React, Visualization, Integration, CI/CD Pipelines, DevOps, Full-stack Development, Technical Leadership, JSON, TypeScript, AWS Lambda, Amazon EC2, API Development, API Integration, Mobile App Development, Team Leadership, Node.js, WebAuth, Microsoft Azure, JSON REST APIs, B2B

Data Engineer

2020 - 2020

Ferma Flooring

Developed logistics and accounting tools tailored to the client's objectives, seamlessly integrating millions of data entries. Used C# and .NET to cut down significantly on manual input and error expenses, saving over $500,000.
Designed the system's architecture on my own, based on the PM's specifications. Helped the PM during the launch by testing everything and ensuring everything was functioning properly.
Connected the C#.NET application with a standalone Python application and the Quickbooks Desktop application, utilizing APIs to synchronize all data into a single location.

Technologies: Desktop App Development, SOAP, Relational Databases, C#, Java, C++, Amazon EC2, Data Engineering, Intuit QuickBooks, Algorithms, C#.NET, .NET, Docker, Python, Full-stack, APIs, Security, Integration, CI/CD Pipelines, DevOps, Full-stack Development, JSON, API Development, API Integration, JSON REST APIs, Django, REST APIs, B2B

Senior Software Engineer

2017 - 2018

Microsoft

Developed cutting-edge software tools utilizing C#, .NET, and Microsoft SQL Server that significantly enhanced Bing Maps Directions services' performance by up to 10%. As a result, the service will remain competitive and relevant in the long run.
Created the pipeline architecture for the tools, designed the data flow, and transformed it into a fully automated performance-tracking system. This system evaluates the results of the core development team every month.
Developed an approachable JavaScript front end to effectively visualize the tool's input and comprehensively evaluate performance against historical data, custom scenarios, and competitors.

Technologies: Azure, Microsoft SQL Server, JavaScript, .NET, C#, Algorithms, SQL, CSS, C#.NET, Architecture, Back-end, Front-end, HTML, React, HTML5, Full-stack, APIs, Visualization, CI/CD Pipelines, DevOps, Full-stack Development, JSON, API Development, API Integration, Azure SQL, Azure Cosmos DB, Microsoft Azure, Azure PaaS, JSON REST APIs, UML, REST APIs

Enterprise Application Developer

2016 - 2017

BTC Embedded Systems

Researched new ways of converting natural language requirements into formal language, thus automating the processing of requirements. Reduced requirement processing by up to 16% for key customers like Daimler.
Developed a module within a larger enterprise Java application that would allow car manufacturers to define specific modules for testing their electronic devices, reducing manual entry costs and error risk by up to 25%.
Screened candidates and mentored interns, training them to become reliable team members and use the company's frameworks accordingly.

Technologies: SQL, JavaScript, SWT, Eclipse RCP, CSS, Java, Back-end, HTML, MySQL, APIs, Full-stack Development, API Integration, UML, REST APIs

Full-stack Developer

2015 - 2016

Deventure

Developed a web platform for the training of air pilots, where managers could assign mandatory courses to their personnel. The courses had content such as videos and quizzes. Used technologies include C# and ASP.NET.
Designed the architecture for the platform and implemented the basic structures.
Used GitHub for code versioning and Microsoft SQL for modeling the database.

Technologies: Razor, JavaScript, ASP.NET, .NET, C#, C#.NET, SQL, CSS, Back-end, Front-end, HTML, Full-stack, APIs, Full-stack Development, JSON, API Development, API Integration, Microsoft Azure, JSON REST APIs, UML, REST APIs

QA Software Engineer

2013 - 2014

ACI Worldwide

Created test scenarios for payment fraud tools and integrated them into the more extensive testing tools.
Collaborated with the development team and the business analysts to define the critical areas of the fraud detection system and ensure testing coverage according to the delivery schedule.
Implemented automated tests using Selenium-like tools and ensured the success of the company's software.

Technologies: Java, Unit Testing, Selenium, MySQL, APIs

Experience

Token and NFT Ecosystem

As the CTO and lead developer of a Web3 startup, I created and established an ecosystem for a meme coin. The system was comprised of a decentralized exchange and two NFT collections in addition to the coin itself. I put in tremendous effort to ensure that the project was delivered successfully and would be maintained over the long term.

Web Scraper Tool for AI Training

A Python web scraper was successfully implemented to scrape movie pages on IMDb and extract a large amount of data. The scraper and the obtained data were delivered to the client and subsequently utilized for machine learning and AI training without any issues.

Web Scraper Tool for Academics

I developed a powerful Java/Scala web scraping tool capable of gathering essential business data from numerous companies. This exceptional application was successfully sold to a prestigious economics university in Switzerland, where it serves as an invaluable asset to professors and students alike, aiding them in their research endeavors.

Data Processing App

I developed a Java desktop application that streamlines accountant and management tasks through the automated collection of data from multiple .xlsx files in accordance with a variety of rules. This tool was successfully sold to a local branch of a Fortune 500 company, effectively automating up to 10 hours of work per month for each of the team members involved.

Messaging App with Enhanced Protection

I successfully implemented and deployed an Android messaging application, enabling users within a specific organization to send direct messages and create group chats. The app also provides a feature for encrypting secret messages, which can only be decrypted by the recipient through the manual application of a key code.

Volunteer Activity App

I developed an Android application that effectively managed the volunteer activity for a local youth organization. The app provided complete transparency and streamlined tracking of individual involvement, giving the organization's president a comprehensive overview of each member's contributions.

Skills

Languages

Java 9, Java 7, Java 8, Java 6, Java EE 8, Java SE 8, XML, Bash, Bash Script, Java, C#.NET, JavaScript, HTML, CSS, SQL, PHP, C, C++, HTML5, Python, Ruby, C#, Kotlin, UML, VBScript, VB.NET, Python 3, Python 2, Solidity, GraphQL, TypeScript, Scala

Frameworks

Ruby on Rails 3, Ruby on Rails 4, Ruby on Rails 5, .NET 5, .NET 3, .NET 2, .NET 4, .NET Core, ASP.NET MVC, Windows Presentation Foundation (WPF), Redux, Spring Boot, Spring 4, Spring 5, Spring ORM, Spring MVC, Spring Core, ASP.NET Core, ASP.NET Core 2, ASP.NET Core MVC, Entity Framework Core, OAuth 2, Razor Pages, ASP.NET Web Services, Django, Laravel, JUnit, Ruby on Rails (RoR), React Native, Swing, Razor, Bootstrap, ASP.NET, Spring, .NET, Next.js, Spring R, JSF, Jakarta Server Pages (JSP), Angular, Tailwind CSS, ASP, Selenium

Libraries/APIs

Ruby ERB, Ruby on Rails API, Visual Studio SDK, Java RMI, AutoMapper, GitHub API, QuickBooks API, Google API, Google APIs, Google Maps, Google Sheets API, Bing API, Bing Maps, Bing Maps API, Facebook API, Facebook Ads API, Stripe Connect API, Stripe API, Google Maps API, SendGrid API, JSON API, jQuery, SWT, Entity Framework, REST APIs, Node.js, Web API, React, Web3.js, API Development, Sidekiq, Gmail API, Handlebars, Vue

Tools

RubyMine, Visual Studio, Visual Studio 2008, Visual Studio .NET, Visual Studio 2019, Visual Studio 2012, Visual Studio 2013, Visual Studio 2010, Atom, JavaCC, Amazon CloudWatch, SourceTree, Trello, Jira, Git, Subversion (SVN), TortoiseGit, TortoiseSVN, Azure App Service, Microsoft Azure App Service, Facebook Ads SDK, SendGrid, Microsoft Unit Tests, Bitbucket, Eclipse RCP, GitHub, Jenkins, Apache, Docker Compose, Apache Maven, Figma, Ghost, WiX, Android Studio, Slack, Skype, Microsoft Teams

Paradigms

Automation, REST, DevOps, Test-driven Development (TDD), Windows App Development, Desktop App Development, Unit Testing, Microservices, RESTful Development, Agile, Functional Programming, B2B

Platforms

Visual Studio 2016, Visual Studio Code (VS Code), Visual Studio 2017, Bing Ads, Google Cloud Platform (GCP), Windows, Azure, Azure Service Fabric, Jakarta EE, WordPress, Heroku, Social Media Advertising, Ethereum, Blockchain, Mapbox, JVM, Windows Server, Docker, Arduino, Raspberry Pi, Android, Linux, MacOS, Amazon Web Services (AWS), Firebase, Amazon EC2, iOS, Jupyter Notebook, AWS Lambda, Azure PaaS, Eclipse, Drupal, OpenCart

Storage

JSON, Redis, Spring Data, Spring Data JPA, Azure SQL, Azure SQL Databases, MySQL, PostgreSQL, Microsoft SQL Server, Databases, NoSQL, Relational Databases, Cloud Firestore, Azure Cosmos DB

Other

Ruby Gems, Ruby Performance, C# Operators, Jakarta EE Design Patterns, Automation Tools, Webhooks, SOAP, QuickBooks Online, Intuit QuickBooks, Google, Google Ads, Front-end, Back-end, Windows 10, Windows App Design, Desktop App Design, Ajax, Microsoft Azure, OAuth, Software Engineering, API Connectors, Enterprise Resource Planning (ERP), RESTful Microservices, User Authentication, Algorithms, Web Scraping, APIs, eCommerce, Data Engineering, Data, Data Scraping, Scraping, Cryptocurrency, Architecture, Full-stack, Blogging, Visualization, Integration, CI/CD Pipelines, Full-stack Development, API Integration, Mobile App Development, Team Leadership, JSON REST APIs, Windows Services, Bluetooth, Web3, Artificial Intelligence (AI), ChatGPT, OpenAI GPT-3 API, OpenAI GPT-4 API, Security, Technical Leadership, Push Notifications, WebAuth, WhatsApp, OpenAI, Teams, CAPTCHA, Charting, Excel 365, Machine Learning, Polygon, Apollo, Secure Multi-party Computation

Industry Expertise

Project Management

Education

2018 - 2020

Master's Degree in Software Engineering

Universitatea Politehnica Timisoara - Timisoara, Romania

2013 - 2017

Bachelor's Degree in Computer and Software Engineering

Universitatea Politehnica Timisoara - Timisoara, Romania