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Angel Venchev
Verified Expert in Engineering
Full-stack Developer
Sofia, Bulgaria
Toptal member since February 19, 2019
Bio
Angel is an experienced full-stack developer. He's most proud of building an end-to-end, encrypted mobile application that helps people store and share what's most valuable to them. He led a team of four to migrate from a legacy system and a team of two to create a white-boxed coaching mobile application. With over ten years of experience in the industry, Angel worked on projects for companies like Reddit, Microsoft, Wells Fargo, and others.
Portfolio
Tap Tap Send
React Native, React Query, Redux
Reddit, Inc.
React, User Interface (UI), CSS, Redux, GitHub, UI Testing
CastleKeyp
React Native, React, GraphQL, Redux, Encryption, End-to-end Encryption
Experience
- Git - 8 years
- Agile Software Development - 7 years
- ASP.NET Core - 5 years
- React - 3 years
- React Native - 3 years
- Redux - 3 years
- AWS Lambda - 3 years
- Encryption - 1 year
Preferred Environment
Visual Studio Code (VS Code), Visual Studio, Mobile
The most amazing...
...app that I've built is a full, end-to-end, encrypted-mobile and web application that helps you store and share what's valuable to you.
Work Experience
Software Developer
2025 - PRESENT
Tap Tap Send
- Rebuilt the design system for Tap Tap Send's mobile application.
- Worked closely with a designer to fine-tune the user experience.
- Contributed to every change that got released, which was feature-flagged and carefully and gradually released.
Technologies: React Native, React Query, Redux
React Developer
2022 - 2025
Reddit, Inc.
- Contributed to the Ads Platform and managed to help the team get from 2,800 to 15,000 monthly active advertisers (MAAs).
- Worked as part of a 7-10 person team with frequent syncs using a scrum methodology.
- Contributed to the consumer Reddit website and helped launch a "Promote Post" feature that helped raise MAAs even further.
Technologies: React, User Interface (UI), CSS, Redux, GitHub, UI Testing
Mobile and Web Developer
2020 - 2023
CastleKeyp
- Developed the application's whole end-to-end encryption model from the ground up, creating a vault with local keys, symmetrical encryption for all the data, asymmetrical encryption for sharing access to users' data, and deriving encryption keys.
- Worked on the UI and animations of the application closely with another Toptal mobile developer.
- Helped reach the beta release of the application and supported the application during the beta testing period.
- Created a code-generation engine to tackle a large number of bootstrap files that needed to be generated to support storing different data models into Redux after fetching them from the back end.
Technologies: React Native, React, GraphQL, Redux, Encryption, End-to-end Encryption
Software Architect
2020 - 2023
Engatech, Inc. (via Toptal)
- Built the architecture and database design for a life coach mobile application called Life Drive.
- Created the architecture, authentication, authorization, navigation, and state management for the mobile application with React Native.
- Developed the architecture, authentication, authorization, and state management for the CMS, supporting users and data for the application.
- Operated a project management system for transparent tracking and prioritizing tasks with development.
- Communicated effectively with the client, saving their time to focus on more valuable things for their business.
- Led a team of three people to implement new features and functionalities for the existing system based on my architecture.
- Was consulted in the process of hiring mobile, web, and back-end developers. Performed highly explicit and specific tasks for them.
- Owned the automation and led the release process for mobile apps, web CMS, and back-end solutions.
Technologies: Redux, React Router, React, React Native, Amazon S3 (AWS S3), AWS Lambda, MariaDB, .NET Core, REST APIs, Git, C#.NET, C#, .NET, Scrum, Agile Software Development, Serverless, Mobile Development, Amazon Web Services (AWS), Android
Web Developer
2020 - 2021
Trialbee
- Helped build a reusable form-builder library with styling, glossary, and preview features.
- Tracked and fixed bugs, using Jira as a reporting tool.
- Wrote detailed documentation about the library, its structure, and usage scenarios.
Technologies: React, Material UI, GraphQL, Git, Scrum, Agile Software Development, Serverless, Mobile Development, Amazon Web Services (AWS)
React Contractor
2020 - 2020
Microsoft
- Helped build the Microsoft Dynamics 365 installation wizard for different components.
- Integrated an end-to-end testing solution based on Playwright.
- Helped put in place and follow best practices in development and testing.
Technologies: React, Jest, REST APIs, Git, Scrum, Agile Software Development, Amazon Web Services (AWS)
iOS React Native Developer
2020 - 2020
WeDeFi
- Worked with WeDeFi on their existing React Native codebase to help them push an MVP of their iOS application.
- Introduced central-state management with Redux into the project and moved all HTTP requests into thunks so screens could subscribe to the HTTP responses.
- Launched the project in the store and oversaw it reaching over 6,000 users investing in real cryptocurrency.
Technologies: App Store, Xcode, iOS, Redux, React Native, Git, Mobile Development, Amazon Web Services (AWS), Android
Mobile Developer
2019 - 2020
Code Particle Inc. (via Toptal)
- Helped the team to build a real-time patient-monitoring system integrated with Google Fit and Apple Health.
- Contributed to various features throughout the app in a team of four.
- Collaborated closely with the product owner to polish design elements of the application, both from a UI and UX perspective.
Technologies: JavaScript, Jest, Redux, React Native, Git, Scrum, Agile Software Development, Mobile Development, Amazon Web Services (AWS), Android
Freelance Developer
2019 - 2020
Austin Distributing (via Toptal)
- Built a system for managing metadata related to hose sales in their original ERP system, using ASP.NET Core and React.
- Built a sophisticated authorization system with roles, claim-based authentication, and a password-recovery mechanism using email.
- Integrated the solution with an existing database without changing any underlying infrastructures.
- Built a system for generating a commodity report using React and .NET Core.
Technologies: .NET Core, React, ASP.NET Core, REST APIs, Git, C#.NET, C#, .NET, Agile Software Development, Amazon Web Services (AWS), Relational Databases
Freelance Developer
2019 - 2019
Select Quote (via Toptal)
- Implemented a web API to transfer credit card data to a secure PCI compliant and relay back a token representation of the credit card data.
- Implemented a reporting service that gathers daily reports from Google AdWords and Bing Ads.
- Set up deployment pipelines for deploying AWS Lambda-based services in .NET and Node.js.
- Migrated SQL Server stored procedures into C# using Entity Framework.
- Documented logic from a proprietary language to migrate the logic to C#.
Technologies: SQL, Azure Cloud Services, AWS Lambda, ASP.NET Core, .NET Core, C#, REST APIs, Git, C#.NET, .NET, Scrum, Agile Software Development, Amazon Web Services (AWS), Relational Databases
Senior Developer
2018 - 2019
Sircle Advertising
- Worked on a threat awareness React Native mobile application using an ASP.NET Core back end.
- Designed the UI and UX of the mobile application according to Apple's and Google's visual style guide.
- Added logging for mobile applications to improve the stability and reliability of the apps over time.
- Worked on implementing the admin dashboard for installing specifically designed boxes for real-time tracking of alcohol sales in the United States using ASP.NET Core and React.
- Reviewed my peers' code and suggested improvements in coding standards.
Technologies: Microsoft SQL Server, Entity Framework Core, Webpack, Redux, React, React Native, .NET Core, ASP.NET Core, REST APIs, Git, C#.NET, C#, .NET, Scrum, Agile Software Development, Amazon Web Services (AWS), Relational Databases
Team Lead
2017 - 2018
MentorMate
- Led and managed a team of four people to deliver a robust system that serves the client's needs—to quickly configure custom-automated tasks built on top of smaller components of those tasks.
- Migrated a legacy system from the integrated windows task manager to a newly acquired task scheduling tool called JAMS.
- Prioritized effectively according to business needs.
- Communicated constantly with the client's contact person to clarify needs and requirements.
Technologies: Task Scheduling, Windows PowerShell, Trello, Git, C#.NET, C#, .NET, Scrum, Agile Software Development, Amazon Web Services (AWS), Kanban, Relational Databases
.NET Developer
2015 - 2017
MentorMate
- Took a key role in developing the core back end for Storyworks1, a sales enabling CMS system.
- Owned version control, database design, and automated deployment.
- Developed integration with external applications, including Salesforce and InsiteCommerce.
- Worked on the optimization of the UWP client application.
- Wrote end-to-end tests using Selenium with ChromeDriver and C#.
- Performed code reviews and established best practice coding practices.
Technologies: Universal Windows Platform (UWP), AngularJS, .NET Core, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, REST APIs, Git, C#.NET, C#, .NET, Scrum, Agile Software Development, Amazon Web Services (AWS), Hangfire, Relational Databases
.NET Developer
2013 - 2014
Omegaosft Ltd.
- Took part in the development of the enterprise version of the main product of the company.
- Worked on an independent reporting engine used in the larger project.
- Gained experience in the development of payroll, CRM, and HR software.
- Gave a presentation on Git and version control systems in general.
- Learned best practices in web development from other developers.
Technologies: jQuery, JavaScript, HTML, CSS, ASP.NET Web Forms, ASP.NET MVC, REST APIs, Git, C#.NET, C#, .NET, Scrum, Agile Software Development, Amazon Web Services (AWS), Hangfire, Relational Databases
Experience
CastleKeyp
https://castlekeyp.comCastleKeyp is an end-to-end encrypted application that lets you securely store and share the information that matters to you the most. The system ensures that every piece of information you are about to enter will be end-to-end encrypted by the system and visible only to you and those with whom you choose to share it. CastleKeyp cannot see your information on our servers, sell it or give it away by mistake to hackers or scammers. You can securely store and selectively share your information through CastleKeyp with perfect peace of mind.
Healthsnap
https://healthsnap.io/The world’s first lifestyle data analytics platform for modern patient care.
A real-time health monitoring solution that connects individuals with health specialists and helps remote health monitoring.
A real-time health monitoring solution that connects individuals with health specialists and helps remote health monitoring.
Asset Tracking System for Austin Distributing
A simple asset tracking system that helps with lifecycle management and tracking. The system is fairly simple, but the more interesting part is that it was implemented on an existing CRM database without compromising the original CRM, taking advantage of the data stored underneath.
Drankulka
An application for designing and ordering custom-made bracelets.
Targeted at the Bulgarian market, the application helps people design their unique bracelet and order it. The bracelets are made from natural stones, and the significance of each stone type is explained within the application.
It includes a tutorial on how the application is to be used and a good UX to guide the user through the process.
Targeted at the Bulgarian market, the application helps people design their unique bracelet and order it. The bracelets are made from natural stones, and the significance of each stone type is explained within the application.
It includes a tutorial on how the application is to be used and a good UX to guide the user through the process.
Electric Eye
A threat awareness mobile application written in React Native using AWS Lambda as a back end. It helps companies keep their employees safe when sent on business trips to Mexico. It has a map that shows potentially dangerous areas to avoid. A GPS navigation system that helps you pick a safer route based on the dangerous areas. And most importantly, a panic button will stream video, audio, and GPS data to the servers and immediately send help to your location.
3x3 Insights
A solution for real-time tracking of Alcohol sales in US retail stores. Gathering all the data, aggregating it, and bringing semantics to the clients in a beautiful dashboard.
Worked with clients like Walmart, integrating external systems like WorkMarket.
Worked with clients like Walmart, integrating external systems like WorkMarket.
Insite Portfolio (aka Storyworks1)
A sales-enabling CMS system lets users organize, manage, and browse different types of content. It helps salespeople organize their portfolios and present products on the go. With different clients, including iOS, Android, Universal Windows Platform, Windows mobile, and web, it supports 99% of all devices on the market. It lets users upload videos, pictures, PDFs, static HTML websites, and more to impress potential customers.
Ritulette
Took part in the 2016 Game Jam, creating a gesture-based Android app trained with a neural network using Android with a .NET back end. The application represents daily "rituals" that all of us do, like washing the dishes or rolling dice, and would show the image on the screen, expecting the user to copy the movement, using the phone as the object.
Try On
With my team, we took second place in a prestigious hackathon in Sofia called HackFMI7 and created a platform for trying on clothes online on a 3D model of the user that they provided, using the NVidia PhysX engine.
Education
2011 - 2016
Bachelor's Degree in Computer Science
Sofia University "St. Clement Ohridski" - Sofia, Bulgaria
2013 - 2014
Exchange Year Participant in Informatics
Karlsruhe Institute of Technogy - Karlsruhe, Germany
Skills
Libraries/APIs
REST APIs, React, jQuery, React Router, AES, Google Maps, React Query
Tools
Git, Hangfire, Visual Studio, Trello, Webpack, Xcode, GitHub
Languages
C#.NET, C#, SQL, JavaScript, CSS, HTML, GraphQL
Frameworks
ASP.NET Core, .NET Core, .NET, ASP.NET MVC, ASP.NET Web API, Windows PowerShell, React Native, Redux, ASP.NET Web Forms, AngularJS, Entity Framework Core, Jest, Material UI, Microsoft Kinect
Paradigms
Functional Programming, Scrum, Agile Software Development, Kanban, Mobile Development, REST
Storage
Redis, Elasticsearch, Relational Databases, MariaDB, Microsoft SQL Server, Azure Cloud Services, Amazon S3 (AWS S3)
Platforms
Visual Studio Code (VS Code), AWS Lambda, iOS, Android, Universal Windows Platform (UWP), Mobile, Amazon Web Services (AWS)
Other
Serverless, Task Scheduling, App Store, Informatics, Encryption, End-to-end Encryption, RSA, PBKDF2, HMAC Key Derivation function (HKDF), Virtual Reality (VR), User Interface (UI), UI Testing
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