Rab Nawaz Hussain

Results-driven Senior Full-Stack Developer with over 9 years of experience specializing in .NET Core, Angular, Node.js, React, and Unity3D. Expert in Behavior-Driven Development (BDD), Test-Driven Development (TDD), and User Acceptance Testing (UAT) using Reqnroll (formerly SpecFlow), Gherkin, MSTest, xUnit, and NUnit. Proven track record of writing high-quality, maintainable acceptance tests that serve as living documentation and drive development.

Designed scalable systems using Domain-Driven Design (DDD), built secure RESTful APIs, and delivered real-time IoT dashboards. Experienced in mentoring teams on modern testing practices and shifting testing left in Agile environments. Currently developing robust IoT backend solutions with strong emphasis on automated testing, reliability, and security.

Backend Developer at Hato Pakistan (2025-10 – Present)

Netherlands-based Smart Lighting Company

• Developing high-reliability.NET backend for IoT lighting controllers running on embedded Linux.
• Writing comprehensive BDD acceptance tests using Reqnroll (Gherkin) that act as executable specifications and living documentation.
• Implementing unit and integration tests with xUnit + Moq, achieving >85% code coverage.
• Building secure device-to-cloud communication via Azure IoT Hub with robust error handling and retry policies.
• Setting up Jenkins CI/CD pipelines with automated test execution on every commit.

Senior Full-Stack Developer at MTBC (now CareCloud) (2020-01 – 2025-09)

U.S. Healthcare IT Company

• Championed BDD adoption using Reqnroll (SpecFlow) – wrote hundreds of feature files in Gherkin that served as acceptance criteria and automated tests.
• Led the team in writing clean, maintainable step definitions and living documentation using SpecFlow+ LivingDoc.
• Implemented unit testing suite with MSTest and xUnit, significantly reducing regression bugs.
• Developed real-time IoT lighting control backend (Azure IoT Hub + Event Hub) with full BDD test coverage.
• Built responsive Angular dashboards with RxJS-powered real-time updates and comprehensive component/integration tests.
• Mentored 8+ junior/mid-level developers on TDD, BDD best practices, and clean code principles.

Full-Stack Developer at Nimble Ideas (2019-01 – 2020-12)

• Delivered scalable MERN/MEAN stack applications with Jest and React Testing Library unit tests.
• Integrated third-party APIs with resilient error handling and contract testing.

Game Developer (Unity3D) at Tkxel (2016-01 – 2018-12)

• Built 2D/3D games with physics and AI using Unity + C#.
• Wrote automated tests for game logic using Unity Test Framework and NUnit.

Master in Information Technology – Virtual University of Pakistan (2019 – 2021)

BS in Bioinformatics – COMSATS Institute of Information Technology (2009 – 2013)