Tiberiu is available for hire
Hire TiberiuTiberiu Lepadatu
Verified Expert in Engineering
Software Developer
Constanța, Constanța County, Romania
Toptal member since October 29, 2020
Bio
Tiberiu is a senior developer specializing in building complex architectures on the back end with elegantly simple code and easy-to-use UXs for the front end. His main stack consists of React, Vue, Node.js, and Flask. He worked as a freelancer for eight years, working all around the globe. He's delivered projects for Precision Drilling, Reserve, Bayern AG, Airbus Defence & Space, Enel, and Topflight Apps. Tiberiu has also founded two startups and is now getting back into freelancing.
Portfolio
Toptal Engagement
React, React Native, NestJS, TypeScript
Appworks Studio Corp
Node.js, Back-end, TypeScript, React Native, Large Language Models (LLMs)...
Axion Ray LLC
JavaScript, CSS, React, Node.js, D3.js, Full-stack, Data Visualization...
Experience
- Front-end - 12 years
- React - 12 years
- Styling - 10 years
- Node.js - 9 years
- React Native - 8 years
- CSS - 7 years
- TypeScript 3 - 6 years
- SCSS - 5 years
Preferred Environment
Visual Studio Code (VS Code), Docker, Linux, Ruby
The most amazing...
...project I've had was Reserve, scaling from four countries to 25, covering more than 75% of Latin America. I was the release manager and lead developer.
Work Experience
Senior Fullstack developer
2026 - 2026
Toptal Engagement
- Took ownership of back-end architecture for critical product services, from payments and fraud detection to accounting and infrastructure.
- Integrated Stripe, SEON, and Optimove APIs, connecting payment processing, fraud prevention, and customer engagement into a unified back-end platform.
- Built an event-driven ledger system that recorded every financial and user transaction, providing a reliable audit trail for reconciliation and reporting.
- Designed idempotent APIs capable of handling retries safely across auto-scaling server environments, improving reliability under high load.
- Developed user configuration and preference management services while working closely with product and front-end teams to ship features end-to-end.
Technologies: React, React Native, NestJS, TypeScript
Back-end Node.js/TypeScript Developer
2025 - 2025
Appworks Studio Corp
- Owned end-to-end product development for AI-powered SaaS products, building React front ends, Node.js and TypeScript services, APIs, and cloud infrastructure in a fast-moving startup environment.
- Designed and shipped VoiceAI-powered subscription workflows for the US market, integrating payment systems and conversational AI to automate customer onboarding and conversion.
- Built AI-driven analytics platforms with real-time data pipelines and interactive dashboards, helping customers monitor business performance, customer acquisition, and engagement.
- Developed LLM-powered reporting workflows that automatically generated actionable insights and recommendations, reducing manual analysis and accelerating customer decision-making.
- Worked closely with founders and product stakeholders, rapidly shipping features, iterating from user feedback, and wearing multiple hats across front-end, back-end, infrastructure, and AI integrations.
Technologies: Node.js, Back-end, TypeScript, React Native, Large Language Models (LLMs), AI Agents, Agentic AI, Gemini, VoIP, Agentic Frameworks, Claude, ChatGPT, Twilio, Twilio API, Solution Architecture
Full-stack JavaScript Developer
2024 - 2025
Axion Ray LLC
- Built and shipped full-stack features across React, Node.js, and SQL, collaborating closely with product and design to deliver customer-facing functionality at startup speed.
- Led the migration from MongoDB to SQL, redesigning the data model and reducing analytics query times by nearly 90%, while improving platform scalability.
- Developed real-time operational dashboards that enabled manufacturing customers to monitor plant performance, investigate production issues, and make data-driven decisions.
- Built back-end services and API integrations for automated reporting pipelines, improving reporting efficiency by 20% and reducing manual operational work.
- Contributed across the entire product lifecycle—from implementing UI components and back-end APIs to database optimization, deployment, and production support.
Technologies: JavaScript, CSS, React, Node.js, D3.js, Full-stack, Data Visualization, Solution Architecture
Senior React Native Developer
2021 - 2023
Reserve
- Managed the release process for the app, ensuring timely delivery to customers. Implemented automatic deployments for mobile pipelines for our 100,000 members.
- Adapted the application for the Mexican audience through strategic STP integration, contributing to increased user appeal and engagement.
- Created reports based on deployment metrics and integrate them into the process to speed up the release process. Coordinated with stakeholders to ensure seamless code pushes.
- Spearheaded the refactoring initiative, implementing a new design system across the entire application for a cohesive and modern user experience.
- Implemented blocking notifications in just two weeks to inform users about some breaking changes inside the app.
- Refactored the whole application to move from JavaScript and use TypeScript instead.
- Reimplemented the connection to the back end using openAPI instead of generic fetches, thus improving the collaboration between the back-end and front-end workers.
- Improved the security of the application by implementing SOC2 compliance.
- Implemented custom secure and persistent state management for the wallet application.
Technologies: React, React Native, Sentry, D3.js, MobX, Visual Studio App Center, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, MongoDB, Minimum Viable Product (MVP), Architecture, Progressive Web Applications (PWAs), Figma, Mobile, OAuth 2, Front-end, Mobile First, CI/CD Pipelines, Mapbox, Firebase Analytics, Plaid, Plaid API, Online Banking, Data Scraping, API Integration, Solution Architecture
React Developer
2020 - 2023
Precision Drilling
- Accelerated the application's build time by an impressive 10x by transitioning from webpack to Vite as the build system while also eliminating create-react-app scripts.
- Optimized application performance by locally implementing all components, removing antD, and significantly reducing bundle size, leading to faster loading times.
- Devised and implemented an innovative state management logic within the URL, streamlining data passing through the company and enhancing overall efficiency.
- Pioneered the development of a robust mechanism for generating reports, empowering data-driven decision-making processes.
Technologies: React, D3.js, Azure, AmCharts, Visx, PWA, Vite, Webpack 4, Webpack 3, Application State Management, Redux, Redux-Saga, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, MongoDB, Next.js, Minimum Viable Product (MVP), Tailwind CSS, Architecture, Progressive Web Applications (PWAs), Figma, iOS, Android, Front-end, Mobile First, CI/CD Pipelines, Mapbox, Turf.js, Firebase Analytics, Online Banking, Data Scraping, API Integration, .NET
Founder
2019 - 2021
Trust2Match
- Founded a fintech startup with a team of four that offered a SaaS and a business model comprising a B2B and B2C. The B2B part allowed all the banks and the fintech to coexist in a shared space, and the B2C brought customers to this space.
- Oversaw and created the architecture of the app and thought about how the microservices are going to interact with each other. Transitioned eventually to the front-end part because there was a need at the time.
- Worked in a hectic environment and built a very exciting product. Showcased it to some strong players in the fintech world, one of which is the director of Banca Transilvania and the one from Banca Feroviara Romana.
- Built a company with the principal value proposition of putting all the banks and financial institutions on common ground by implementing APIs from the banks that accepted European open banking regulations. This built a free fintech market.
Technologies: Amazon Web Services (AWS), gRPC, React Native, Express.js, Web Architecture, Node.js, React, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, MongoDB, Flutter, Minimum Viable Product (MVP), Tailwind CSS, Architecture, OAuth 2, Front-end, Mobile First, Firebase Analytics, Plaid API, Python, Data Scraping, API Integration
Contractor
2020 - 2020
Tapwater
- Developed a reliable front end with an emphasis on improving the user experience by optimizing the flows that the user has in the application.
- Solved bugs in the codebase that were directly impacting the clients of the application.
- Implemented strict checks for TypeScript in the codebase.
Technologies: Global Product Management, gRPC, Java 9, React, React Native, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, Minimum Viable Product (MVP), OAuth 2, Front-end, Mobile First, Python, API Integration
Lead Developer
2020 - 2020
Topflight Apps
- Developed multiple applications in my time there as this company specialized in creating MVPs: an online store app, an app for self-monitoring a COVID-19 infection, and an interface for tracking the prices of cryptocurrencies.
- Tracked and fixed bugs using Clockify and Clickup as reporting tools. Then, we transitioned to using GitHub for organizing our projects.
- Oversaw a project team with three other employees tasked with creating HIPAA-compliant applications from the ground up.
Technologies: React Native, React, Node.js, Firebase, gRPC, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, MongoDB, Flutter, Next.js, Minimum Viable Product (MVP), Webflow, OAuth 2, Front-end, Mobile First, API Integration
Software Engineer | Partner
2013 - 2019
RedPM Organization
- Improved airplane simulators and ensured they met FAA standards, including EET upgrading.
- Developed innovative machine-learning techniques for flight simulators.
- Built a billing service for ENEL in a project alongside my team. This project is especially amazing during the pandemic when everything moved online.
- Maintained and upgraded Boeing, CAE, and Airbus airplane simulators.
Technologies: Node.js, gRPC, Kubernetes, Docker, React, React Native, REST APIs, REST, HTML5, Full-stack Development, Full-stack, HTML, CSS, TypeScript, MongoDB, WordPress, Next.js, Minimum Viable Product (MVP), Front-end, Mobile First, Open Banking, Open Banking APIs
Experience
P4 Deep Learning Detection of Network Intrusions
I developed a system that detects intrusion on the network using low-power programable switches and machine learning algorithms by leveraging both the detection done by a neural network and also the speed of the Tofino switch.
I am now studying the impact of Markov chains in network anomaly detection.
I am now studying the impact of Markov chains in network anomaly detection.
Zoom Clone
https://github.com/tibi77/meetup-workshopI created this application for a workshop that I have kept for Ivy Hacks, a hackathon for people from Ivy League universities. It is a simple camera (Zoom) clone for a full-stack pancakes (client, server) workshop.
App Features:
• You can connect to a server
• You can video chat with others in a single room
• You can have multiple rooms and let the people connect to them
App Features:
• You can connect to a server
• You can video chat with others in a single room
• You can have multiple rooms and let the people connect to them
Signature Forgery Detection Tool
https://github.com/tibi77/simple-signature-analysisI created a signature analyzing tool using JavaScript and HTML5. It detects forgeries by analyzing the way that your hand moves when you are signing. The scope of this project was to help prevent fraud and falsification of signatures for bank statements.
Presentation Application for the National Botanical Garden
With this app, you can recognize plants with a phone camera, do a guided tour, and see events all within one mobile application with a connection to the Azure cloud platform.
The project was the MVP for the National Botanical Garden in Bucharest, and it continues using the code that I and my team have written for it.
The project was the MVP for the National Botanical Garden in Bucharest, and it continues using the code that I and my team have written for it.
ECMWF IFS Python Bindings
https://github.com/esowc/openifs-scm-pythonThis showcases how a modern, interactive development environment can enhance scientific productivity for ECMWF's Integrated Forecasting System (IFS) by calling individual Fortran routines from a Jupyter notebook.
Tools and Examples for Visualizing HPC Performance Data for the IFS
https://github.com/esowc/HPC-performance-profiling-toolI created an interactive way of displaying HPC metrics for the IFS using interactive metrics plotting techniques. I also improved both the reporting capabilities of the IFS developer and the efficiency in finding performance bottlenecks by the IFS developers.
Education
2020 - 2022
Master's Degree in Computer Science
University Polytechnic of Bucharest - Bucharest Romania
2016 - 2020
Bachelor's Degree in Computer Science Engineering
University Politehnica of Bucharest - Bucharest Romania
Certifications
SEPTEMBER 2016 - JANUARY 2021
Linux Professional Institute Certification
Linux Professional Institute
MARCH 2016 - PRESENT
Deutsche Sprach Diplom
Kulturministeriet
Skills
Libraries/APIs
React, Node.js, REST APIs, Turf.js, Plaid API, MobX, D3.js, Redux-Saga, Twilio API
Tools
Figma, Firebase Analytics, Plaid, Expo, Webpack 4, Webpack 3, Sentry, Visual Studio App Center, Claude, ChatGPT
Languages
Python 3, TypeScript 3, JavaScript, HTML5, HTML, CSS, SCSS, CSS3, TypeScript, Python, Ruby, Java 9, Fortran
Frameworks
Express.js, React Native, Redux, Flutter, Next.js, Tailwind CSS, OAuth 2, Electron, .NET, Flask, gRPC, Agentic Frameworks, NestJS
Paradigms
Parallel Programming, REST, Web Architecture, Clean Code
Platforms
Linux, Firebase, Azure, WordPress, Mobile, iOS, Android, Mapbox, Docker, Kubernetes, Amazon Web Services (AWS), Visual Studio Code (VS Code), Webflow, Twilio
Storage
MongoDB
Other
AmCharts, Full-stack Development, Full-stack, Storybook, Minimum Viable Product (MVP), Architecture, Progressive Web Applications (PWAs), Front-end, Mobile First, CI/CD Pipelines, Styling, Open Banking, Open Banking APIs, Online Banking, Data Scraping, Web Scraping, API Integration, Mobile App Development, Solution Architecture, Back-end Development, API Design, APIs, IT Security, German, AI Programming, Distributed Software, Distributed Systems, P4, Global Product Management, Visx, PWA, Vite, Application State Management, Back-end, Large Language Models (LLMs), AI Agents, Agentic AI, Gemini, VoIP, Data Visualization
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