Andrei Statescu
Verified Expert in Engineering
Full-stack Developer
Timișoara, Timiș County, Romania
Toptal member since March 18, 2020
Andrei is a senior software developer and ex-Microsoft engineer with 10+ years of experience developing web, desktop, mobile, and blockchain apps using Ruby, C#, and JavaScript. His products brought $100+ million in total revenue and are used by dozens of millions of users to this day. Being a startup founder himself, Andrei knows exactly what brands need to succeed and how to bridge the gap between business and technology. He is here to help companies grow using the right software and tools.
Portfolio
Experience
- Back-end - 9 years
- JavaScript - 9 years
- Front-end - 9 years
- C#.NET - 9 years
- Java - 7 years
- Ruby on Rails (RoR) - 6 years
- Python - 5 years
- Solidity - 2 years
Preferred Environment
Slack, Git, MacOS, Agile
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
Freelance CTO and Lead Developer for Startups
DX Software
- 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.
Team Lead and Senior Full-stack Developer
A2ZPort LLC
- Took ownership of the product and fixed critical bugs within the existing project setup, making the user's experience smooth and enjoyable.
- Hired a remote team of developers for the client. Led the new and old team members into building the project steadily, quickly meeting deadlines.
- Improved the DevOps setup of the project, reducing costs by 50%. Implemented an efficient CI/CD process that reduced the development time by 30% and removed risks of errors slipping into production.
- Maintained clear communication and expectations with a large number of stakeholders, saving crucial time and increasing the team's performance.
Ruby Web App Developer
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.
Lead Developer
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.
Senior Data Engineer
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.
Senior Software Engineer
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.
Enterprise Application Developer
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.
Full-stack Developer
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.
QA Software Engineer
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.
Experience
Token and NFT Ecosystem
Web Scraper Tool for AI Training
Web Scraper Tool for Academics
Data Processing App
Messaging App with Enhanced Protection
Volunteer Activity App
Education
Master's Degree in Software Engineering
Universitatea Politehnica Timisoara - Timisoara, Romania
Bachelor's Degree in Computer and Software Engineering
Universitatea Politehnica Timisoara - Timisoara, Romania
Skills
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, Vue, JSON API, jQuery, SWT, Entity Framework, REST APIs, Node.js, Web API, React, Web3.js, API Development, Stripe, Google Analytics API, Shopify API, NetSuite API, Google Maps SDK, AWS Amplify, Sidekiq, Gmail API, Handlebars, Redis Queue, WebGL, Babylon.js, WebRTC, Sage
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, Facebook Ads SDK, SendGrid, Microsoft Unit Tests, Bitbucket, Eclipse RCP, GitHub, Jenkins, Microsoft Access, Microsoft Visual C++, Google Analytics, Android Auto, CircleCI, Notion, Retool, Zapier, Oracle ERP, GitLab, Microsoft Power Apps, Claude, Apache, Docker Compose, Apache Maven, Figma, ChatGPT, Ghost, Wix, Prisma, Terraform, Xcode, Pytest, pylint, ANTLR, ELK (Elastic Stack), Microsoft Excel, Microsoft Dynamics, Navision, Expo.io, Android Studio, Slack, Skype, Microsoft Teams, Microsoft Intune, Kibana, Logstash, Microsoft Power BI, Google Kubernetes Engine (GKE)
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#, TypeScript, Kotlin, UML, Visual Basic, Visual Basic .NET (VB.NET), Visual Basic for Applications (VBA), C/AL, SCSS, VBScript, VB.NET, Python 3, Python 2, Solidity, GraphQL, Go, MQL, Swift, Excel VBA, Active Server Pages (ASP), Scala, Rust, Perl
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, Angular, .NET, Selenium, Next.js, Express.js, Android SDK, .NET 6, ASP.NET Web Forms, Spring R, JSF, Jakarta Server Pages (JSP), Tailwind CSS, GStreamer, Ionic, Flutter, SwiftUI, Unity, NestJS, Django REST Framework, .NET MAUI, Flask
Paradigms
Automation, REST, DevOps, Test-driven Development (TDD), Windows App Development, Desktop App Development, Unit Testing, Microservices, RESTful Development, Agile, Functional Programming, B2B, Concurrent Programming, Testing, Mobile Development, Requirements Analysis, API Architecture, CQRS
Platforms
Visual Studio 2016, Visual Studio Code (VS Code), Visual Studio 2017, Google Ads, Bing Ads, Google Cloud Platform (GCP), Windows, Azure, Azure Service Fabric, Jakarta EE (Java EE or J2EE), Android, WordPress, MacOS, Heroku, Social Media Advertising, Ethereum, Blockchain, Mapbox, Vercel, Twilio, Shopify, Desktop, DigitalOcean, Microsoft, Webflow, JVM, Windows Server, Docker, Arduino, Raspberry Pi, Linux, Amazon Web Services (AWS), Firebase, Amazon EC2, iOS, Jupyter Notebook, AWS Lambda, Azure PaaS, Blockchain Platforms, MetaTrader, MetaTrader 5, Apache Kafka, Kubernetes, Windows Server 2012, PostHog, Eclipse, Drupal, OpenCart, WooCommerce, Databricks, Xamarin, Windows Server 2022, Sage Intacct
Storage
JSON, Redis, Spring Data, Spring Data JPA, Azure SQL, Azure SQL Databases, MySQL, PostgreSQL, Microsoft SQL Server, Databases, NoSQL, MongoDB, Elasticsearch, Google Cloud, JSON/XML Schemas, MariaDB, WP Engine, Redis Cache, Relational Databases, Cloud Firestore, Azure Cosmos DB
Industry Expertise
Project Management, High-frequency Trading (HFT), Trading Systems, Marketing
Other
Ruby Gems, Ruby Performance, C# Operators, Jakarta EE Design Patterns, Automation Tools, Webhooks, SOAP, QuickBooks Online, Intuit QuickBooks, Google, 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, Technical Leadership, API Integration, Mobile App Development, Team Leadership, JSON REST APIs, Ethers.js, IT Project Management, Landing Pages, Web Project Management, IT Automation, Invoice Processing, Distributed Systems, Mathematics, Blockchain & Cryptocurrency, ERC-1155, Google Analytics 4 (GA4), Dashboards, Data Visualization, A/B Testing, CTO, Payment APIs, Leadership, Card Payments, Digital Payments, Fintech, Payment Gateways, QR Codes, Stripe Payments, PDF, Customer Relationship Management (CRM), Software QA, Data Aggregation, Large-scale Web Crawlers, Digital Asset Management, Maps, System Administration, Abstract Syntax Trees (AST), Business Analysis, Enterprise Application Development, Electronic Data Interchange (EDI), EDIFACT, Code Review, Source Code Review, Codebase Development, Large-scale Projects, Software Architecture, Data Science, Static Analysis, Application Not Responding (ANR), Performance, Natural Language Processing (NLP), NetSuite, Software Design, Business Requirements, Technical Requirements, Mapping, WebSockets, System Design, Data Architecture, Forms, Workflow, Cloud Services, Cloud, Web Applications, Web Development, Data Processing, Finance, Finance APIs, Front-end Architecture, Front-end Design, Design, API Management, Prompt Engineering, Servers, Crypto, Minimum Viable Product (MVP), Migration, UI Components, Cloud Architecture, HTML Email, Documentation, WinDev, Website Data Scraping, Cursor AI, Windows Services, Bluetooth, Web3, Artificial Intelligence (AI), OpenAI GPT-3 API, OpenAI GPT-4 API, Security, Push Notifications, WebAuth, WhatsApp, OpenAI, Smart Contracts, Ethereum Smart Contracts, Blockchain Design, ÐApp, Forex Trading, MT4 Plugins, kuda, Siri, Mobile Banking, Online Banking, TypeORM, Social Media Apps, 3D, Responsive Web Apps, AI Model Integration, Cloud Platforms, Orchestration, Large Language Models (LLMs), Containerization, AWS DevOps, AI-enabled Applications, AI Tools, Agentic AI, Teams, CAPTCHA, Charting, Excel 365, Machine Learning, Polygon, Apollo, Secure Multi-party Computation, Options Trading, Gatsby, Trading, Brokers, Profit & Loss (P&L), Stable Diffusion, Web Server (IIS)
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