Jason Brown, Developer in Bagworth, United Kingdom
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Jason Brown

Mobile Developer

Bagworth, United Kingdom

Toptal member since November 15, 2016

Expertise
Full-stackFront EndBack-end DevelopersWeb DevelopmentWindows DevelopmentSQLJavaScriptC#.NETCSSC++Microsoft DevelopmentAPIFlutter
Bio

Jason Brown developed CVRankPro, an AI-powered SaaS platform that analyzes job specifications and compares them to candidate CVs, generating matching scores and insights. He built the system using React, Next.js, and Google's Gemini AI, with Azure cloud services for document processing and real-time communication via SignalR, all deployed using Docker and Terraform.

Portfolio

CineMe Ltd
JavaScript, React, Node.js, Next.js, TypeScript, Vercel, AI Integration...
CV Rank Pro
React, Next.js, NestJS, Azure, PostgreSQL, Tailwind CSS, Node.js, Gemini API...
BlueFleet S.L.
Flutter, C#, Angular, HTML, Application State Management, Firebase, SQL...

Experience

  • Microsoft SQL Server - 20 years
  • C# - 15 years
  • C#.NET - 15 years
  • Microsoft Visual Studio - 11 years
  • Angular - 5 years
  • .NET Core - 5 years
  • Flutter - 3 years
  • Web API - 3 years

Preferred Environment

C#.NET, Flutter, Visual Studio Code (VS Code), React, TypeScript, Artificial Intelligence (AI), SQL, Agentic AI, Next.js, Claude Code

The most amazing...

...product I created was CVRankPro, an AI-powered SaaS platform that intelligently matches candidate CVs to job specifications using Google's Gemini AI and Azure.

Work Experience

Full-stack Developer

2026 - 2026
CineMe Ltd
  • Led the beta-to-production launch of Cineme.ai, an AI film-production SaaS, delivering a live demo-ready for the 2026 Cannes Film Festival on a fixed, immovable deadline.
  • Worked directly with a BAFTA-nominated director-founder and a technical advisor from Google DeepMind to meet production standards under tight time pressure.
  • Transitioned an AI-generated/AI-assisted codebase to a stable, production-grade deployment on Next.js 15, Vercel, Supabase, and TypeScript.
  • Implemented Inngest to orchestrate reliable, event-driven background workflows and long-running AI jobs in a live production environment.
  • Optimized server-side rendering and serverless functions, hardening performance and reliability for a high-visibility live showcase.
  • Restructured the database and cloud model for production scale and stabilized Anthropic and OpenAI API integrations powering the platform's AI processes.
  • Maintained strong daily overlap with the London time zone throughout the engagement to collaborate closely with the founder and advisor.
Technologies: JavaScript, React, Node.js, Next.js, TypeScript, Vercel, AI Integration, Claude Code, Inngest, Serverless Functions, Anthropic, OpenAI API, Image Generation

Software Consultant

2025 - 2026
CV Rank Pro
  • Developed an AI CV using React/Next.js/Tailwind to screen CVs against a job description.
  • Hosted on Azure Container Apps, integrated deeply with the Azure platform.
  • Deployed automatically to Azure using Docker Containers and Terraform.
  • Developed using Vercel's AI SDK with extensive use of Claude Code.
Technologies: React, Next.js, NestJS, Azure, PostgreSQL, Tailwind CSS, Node.js, Gemini API, OpenAI API, Claude API, AI SDK, TypeScript, Docker, Terraform, Artificial Intelligence (AI), SignalR, Unit Testing, Cloud Architecture, Supabase, Stripe, ASP.NET Core, AI Tools, Azure Kubernetes Service (AKS), Prompt Engineering, Generative Artificial Intelligence (GenAI), Large Language Models (LLMs), Server-side Rendering (SSR), Web Performance Optimization (WPO), RxJS, WCAG 2, Full-stack Development, Linux, Vector Databases, OpenAI, RAG Systems, React Native, Git, AI Integration, API Integration, Azure Cloud Services, Microsoft Azure, Azure App Service, Claude Code, Vercel

Senior Full-stack Developer

2025 - 2025
BlueFleet S.L.
  • Developed a Flutter app for data input, which included GPS location and details of deliveries and collections.
  • Built a .NET Core 8/C# server with data stored via Entity Framework Core on a PostgreSQL database.
  • Deployed the system via Fastlane to Google Play Console, Docker Hub, and a Docker Compose/YAML script to Linux servers.
Technologies: Flutter, C#, Angular, HTML, Application State Management, Firebase, SQL, PostgreSQL, Kubernetes, Mobile App Design, Minimum Viable Product (MVP), APIs, Identity & Access Management (IAM), Back-end, Mobile Development, Model View ViewModel (MVVM), Web Development, Microservices, React, Mobile App Testing, Unit Testing, Supabase, ASP.NET Core, Server-side Rendering (SSR), Test-driven Development (TDD), Web Content Accessibility Guidelines (WCAG), Web Performance Optimization (WPO), .NET 10, Full-stack Development, Linux, React Native, Git, AI Integration, API Integration, GPS

Senior C#/C++ Developer

2024 - 2025
Connells Group
  • Designed and developed a C++ and C# interface to a SOAP service for requesting and tracking home conveyancing requests.
  • Created Azure functions and queues to securely and reliably receive webhook requests.
  • Configured deployments using Azure DevOps pipelines and Octopus Deploy.
Technologies: C#, C++, SQL Server 2019, CI/CD Pipelines, SQL, Azure DevOps, Octopus Deploy, React, Azure, APIs, Back-end, Web Development, Unit Testing, Cloud Architecture, ASP.NET Core, Test-driven Development (TDD), xUnit, xUnit.net, .NET 10, Full-stack Development, Git, API Integration, Azure Cloud Services, Microsoft Azure, Azure App Service

Senior Full-stack Developer

2023 - 2024
Flying Colours
  • Designed and developed the Flutter app responsible for recording flight training outcomes and uploading these to the back-end server when next connected to the Internet.
  • Spearheaded the creation of an Angular back-end management system.
  • Containerized the software components to enable deployment via a Docker Compose/YAML script.
Technologies: Angular, C#.NET, Flutter, Docker, SQL Server 2019, Full-stack, HTML, CSS, JavaScript, TypeScript, Mobile Apps, .NET Core, Mobile, Redux, .NET, Entity Framework, Entity Framework Core, REST APIs, Cloud Services, ASP.NET, C#, Microsoft Visual Studio, SQLite, Microsoft SQL Server, Android, Visual Studio 2022, Visual Studio Code (VS Code), Web Services, Front-end, Dart, Enterprise, Mobile App Development, Application State Management, Riverpod, SQL, Stripe API, Mobile App Design, Minimum Viable Product (MVP), APIs, Content Management Systems (CMS), Identity & Access Management (IAM), Back-end, Mobile Development, Model View ViewModel (MVVM), Web Development, Microservices, Python, Mobile App Testing, Unit Testing, Stripe, ASP.NET Core, Server-side Rendering (SSR), Test-driven Development (TDD), Web Content Accessibility Guidelines (WCAG), Web Performance Optimization (WPO), RxJS, WCAG 2, xUnit, xUnit.net, .NET 10, Full-stack Development, Linux, React Native, Git, API Integration, GPS

Senior Full-stack Developer

2018 - 2023
Capability Systems
  • Developed and designed a mobile app, Angular website, and C# server back end that collected and stored health-related information in an SQL server database.
  • Designed the system to help with the training and advancement of children with learning difficulties. Ensured the system met the US Health HIPAA Privacy Rule.
  • Spearheaded the design and development of the Angular website, including the NgRx Redux-style state management of the website.
Technologies: Angular, Xamarin, C#.NET, SQL Server 2016, Flutter, Full-stack, HTML, CSS, JavaScript, TypeScript, Mobile Apps, Mobile GPS, .NET Core, Mobile, Redux, .NET, Entity Framework, Entity Framework Core, Web Services, REST APIs, ASP.NET, C#, Microsoft Visual Studio, SQLite, Microsoft SQL Server, Android, Visual Studio 2022, Visual Studio Code (VS Code), Cloud Services, Front-end, Dart, SQL, Mobile App Design, Minimum Viable Product (MVP), APIs, Identity & Access Management (IAM), Back-end, Mobile Development, Web Development, Microservices, Windows Presentation Foundation (WPF), Unit Testing, ASP.NET Core, Web Content Accessibility Guidelines (WCAG), Web Performance Optimization (WPO), RxJS, WCAG 2, .NET 10, Full-stack Development, Linux, Git, API Integration

Senior Developer

2016 - 2017
Dymeng Services
  • Created a dating app using Xamarin.Forms running on iOS and Android for a Toptal client. Large parts were then reused to create a marketing app running on Android and iOS.
  • Developed the ILS app for the iPhone and iPad. This app lets pilots practice their instrument landing system approaches at any airport.
  • Built the NextStop app for iOS, Android, and Windows Phone for use by visually-impaired people—it announces the next stop that a bus will arrive at.
  • Created a REST web service using the Web API that allows the secure downloading of an encrypted SQLite database containing details of nearly 35,000 approaches.
  • Created a Microsoft SQL database to provide the data for the REST web service.
Technologies: C#, Xamarin.Forms, Mobile Apps, Mobile GPS, SQL Server 2015, Mobile, Entity Framework, REST APIs, Web Services, Cloud Services, .NET, ASP.NET, Microsoft Visual Studio, SQLite, Xamarin, Microsoft SQL Server, Android, Visual Studio 2016, Visual Studio Code (VS Code), Front-end, Mobile App Development, FDA, SQL, Stripe API, Mobile App Design, Minimum Viable Product (MVP), APIs, Identity & Access Management (IAM), Back-end, Mobile Development, Web Development, Microservices, Windows Presentation Foundation (WPF), C++, Mobile App Testing, Unit Testing, Stripe, Web Content Accessibility Guidelines (WCAG), RxJS, WCAG 2, .NET 10, Full-stack Development, Amazon Web Services (AWS), Git, API Integration, GPS

Software Consultant

1996 - 2015
Atos Worldline
  • Developed a secure card vault that held encrypted credit card information that complied with PCI DSS standards. This was used by the website that sold UK train tickets that performed over 50,000 transactions per day with a turnover of over $3 million per day.
  • Built the credit card authorization service that authorized the credit card transactions, including 3D Secure authorization that was used for over 50,000 transactions per day.
  • Developed a website that was used to sell train tickets on the British rail network. This was developed using C#, ASP.NET, MVC, and JavaScript.
  • Built a Microsoft SQL Server database to support the above website.
  • Created a replacement for Microsoft CMS (Microsoft's legacy content management system). The replacement allowed the website to move from the legacy 32-bit operating system to modern virtualized operating systems.
  • Worked as a senior developer on a team of up to 15 developers that developed the WebTIS train ticket selling website which was used by East Coast, First Group, and other train operating companies.
  • Designed and developed a large number of the pages and services required for this site. This project was developed in C# V4.0 (initially developed using V2.0) using service-oriented architecture. It uses Microsoft SQL Server as the database, communicating exclusively using stored procedures. The deadline for the initial development of this site was very tight and immovable therefore a large amount of extra effort was required to meet this.
Technologies: ASP.NET, C#, JavaScript, Microsoft Visual Studio, Microsoft SQL Server, Visual Studio 2016, .NET, Cloud Services, Web Services, Front-end, Documentation, SQL, APIs, Back-end, Web Development, C++, Windows Desktop, Unit Testing, Visual Basic, .NET 10, Full-stack Development

Software Consultant

1995 - 1996
NatWest Home Loans
  • Employed to understand then debug this very complex C++ code in order to make the system maintainable.
  • Rationalised the existing undocumented C++ code and designed and implemented an understandable method of extending it, significantly improving the ability of the team to respond to requests from management.
  • Trained the other members of the team so that they could maintain the system themselves and I improved development procedures by introducing SourceSafe and better build techniques.
  • Received a letter of commendation from senior management for our work in supporting a TV marketing campaign.
Technologies: C++, Windows, Windows API, Unit Testing, Visual Basic

Experience

ATrack Mobile App and Website

https://www.atracksolutions.com/
A Xamarin app and Angular website with C# and SQL server back end used to provide training and record training outcomes for children with autism-related learning difficulties. I designed and developed the full-stack implementation of this system, which complies with the HIPAA requirements.

Purchase Train Tickets on the British Rail Network

I developed this page and associated purchase pages that allows the purchase of train tickets for use on the British rail network. It uses C#, ASP.NET, and extensive JavaScript. This website sells over $3 million worth of tickets per day on the busiest days.

Fly ILS Approaches Anywhere

This app uses the GPS location and an extensive database of airport runways to simulate an ILS on any runway. The app allows you to create your own ILS anywhere. Choose a convenient ground feature in Google Maps, enter the coordinates and the runway heading and threshold elevation for this feature then practice your ILS skills. Perfect for keeping your skills up-to-date without annoying your local airfield neighbors and without paying any navigation fees.

CV Rank Pro

An AI-powered CV comparison tool that takes a Job Spec and compares it to a set of CVs/Resumes and scores these according to how close a fit they are to the Job Spec. This is written in React/Next.js/Tailwind/Node.js and hosted on the Azure platform, deployed via Docker Containers and Terraform.

Education

2019 - 2023

Bachelor's Honors Degree in Business Management

Nottingham Business School - Nottingham, United Kingdom

2016 - 2017

Xamarin Certified Mobile Developer in Xamarin

Xamarin University - Online

2001 - 2002

Microsoft Certified Solutions Developer (MCSD) in Computing

Microsoft - Nottingham, UK

1985 - 1988

Bachelor of Engineering (Honors) in Microelectronics and Microprocessor Applications

University of Newcastle upon Tyne - Newcastle upon Tyne, UK

Certifications

JANUARY 2002 - PRESENT

Microsoft Certified Solution Developer

Microsoft

Skills

Libraries/APIs

Web API, Entity Framework, REST APIs, React, Windows API, Node.js, Stripe, Google Maps, Stripe API, RxJS, OpenAI API, Claude API, SignalR

Tools

Microsoft Visual Studio, Claude, Git, Claude Code, Terraform, Azure Kubernetes Service (AKS), xUnit, xUnit.net, AI SDK, Azure App Service

Languages

JavaScript, C#, C#.NET, HTML, CSS, TypeScript, HTML5, CSS3, Dart, C++, SQL, Visual Basic, Python

Frameworks

ASP.NET, Flutter, Angular, Bootstrap 3+, .NET Core, Redux, .NET, Entity Framework Core, Next.js, ASP.NET Core, ASP.NET MVC 5, Riverpod, Windows Presentation Foundation (WPF), React Native, NestJS, Tailwind CSS

Paradigms

Dependency Injection, Service-oriented Architecture (SOA), Model View Controller (MVC), Mobile App Design, Mobile Development, Unit Testing, Test-driven Development (TDD), Management, Model View ViewModel (MVVM), Microservices, Web Performance Optimization (WPO), Azure DevOps

Platforms

Visual Studio 2016, Xamarin, Windows, Visual Studio 2022, Visual Studio Code (VS Code), Mobile, Azure, Windows Desktop, Linux, Vercel, Android, iOS, Windows Phone, Firebase, Docker, Kubernetes, Amazon Web Services (AWS)

Storage

SQLite, Microsoft SQL Server, SQL Server 2016, SQL Server 2019, SQL Server 2017, Azure Cloud Services, PostgreSQL

Other

Xamarin.Forms, OWASP, Full-stack, Mobile Apps, Mobile GPS, SQL Server 2015, Cloud Services, Web Services, Front-end, Mobile App Development, Application State Management, Minimum Viable Product (MVP), APIs, Back-end, Web Development, Mobile App Testing, Server-side Rendering (SSR), .NET 10, Full-stack Development, AI Integration, API Integration, Microsoft Azure, GPS, iPhone, Encryption, CI/CD Pipelines, Documentation, Artificial Intelligence (AI), AI Agents, Agentic AI, Cloud Architecture, Supabase, AI Tools, Prompt Engineering, Generative Artificial Intelligence (GenAI), Large Language Models (LLMs), Web Content Accessibility Guidelines (WCAG), WCAG 2, IT Project Management, Enterprise, FDA, Firmware, Octopus Deploy, Content Management Systems (CMS), Identity & Access Management (IAM), Gemini API, Vector Databases, OpenAI, RAG Systems, Inngest, Serverless Functions, Anthropic, Image Generation

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