I design and build production software across mobile, backend, cloud infrastructure and connected systems — from Flutter applications and Rails APIs to real-time services and hardware-integrated platforms.
Selected platforms, applications and engineering projects spanning commerce, logistics, mobile, web, IoT, developer tooling and connected systems.
Production logistics platform spanning mobile workflows, delivery operations, real-time location services, notifications, payments and backend services.
Unified POS and e-commerce platform connecting mobile and web applications with inventory, sales, orders and vendor operations.
Scalable commerce application backed by a Ruby on Rails API, PostgreSQL and Firebase services.
Web and mobile commerce platform supporting secure transactions, order management and multi-tenant business workflows.
Software platform connecting mobile applications, fulfillment workflows and physical access infrastructure.
Real-time tracking and monitoring software combining GPS data, device telemetry, location services and operational analytics.
Open-source Flutter package providing Kenyan county data and a customizable county selection component.
High-performance web platform focused on SEO, responsive architecture, content delivery and lead generation.
Responsive community platform designed for gamers with modern web architecture and interactive user experiences.
Real-time multiplayer environment focused on synchronized state, live gameplay and global leaderboard functionality.
Mobile task-management application built around recurring responsibilities, task cycles, notifications and a smooth mobile experience.
Offline-first mobile application exploring local processing and intelligent assistance without requiring continuous connectivity.
Desktop voice interaction experiment combining speech recognition, local processing and command-driven workflows.
Mobile financial planning experience focused on savings goals, contribution tracking and simple user workflows.
Weather application focused on API integration, location-aware data and responsive mobile presentation.
Community-focused football application exploring live information, discussions and mobile-first user experiences.
Developer-focused libraries and packages built to solve reusable problems and shared publicly.
A production-ready Flutter UI/UX animation library using an organic physics-based canvas curtain effect for contextual navigation, onboarding and cinematic reveals.
Flutter package for Kenyan county selection and geographical data integration with a customizable picker interface.
A practical stack built around shipping reliable software rather than following a single technology trend.
Applications are only one layer of a system. I work across APIs, databases, messaging, authentication, cloud infrastructure, maps, device communication and the mobile experience that connects everything together.
Some systems require engineering beyond the application layer. My work has included mobile applications, backend services, device communication and physical infrastructure while keeping sensitive implementation details private.
Integrated mobile software with physical infrastructure, connecting application workflows to device-level operations.
Worked across mobile, native platform services and device communication layers to diagnose and integrate connected systems.
Built location-aware and event-driven workflows involving real-time updates, notifications, routing and operational state.
Connected mobile applications, backend services and infrastructure into production workflows while working within security and confidentiality requirements.
Architecture decisions should survive real users, real traffic and real operational constraints.
Good engineering is not only about making software work. It is about making the next change predictable.
Authentication, authorization, validation and infrastructure security belong in the architecture from the beginning.
Performance work starts with understanding where the system actually spends its time and resources.
I am Samuel Wangai, a Full Stack Systems Engineer focused on mobile architecture, backend systems and production software.
My work spans Flutter and native mobile development, Ruby on Rails, Laravel, Node.js and Rust backends, PostgreSQL and distributed data systems, cloud infrastructure and connected hardware.
I enjoy working on problems where the boundary between product development and systems engineering disappears: real-time applications, logistics platforms, commerce, developer tooling, APIs, infrastructure and physical system integrations.
The goal is simple: build software that is reliable, understandable and ready for real-world use.