JufielLariosa
Senior Mobile Engineer | Flutter | Full Stack | Technical Lead.
9+ years building fintech, enterprise, and SaaS products across mobile, web, and backend. Primary stack is Flutter and Dart, with hands-on experience in React Native, React.js, Next.js, Node.js, and TypeScript — leading distributed teams and shipping systems used by thousands.
9+
Years Exp.
10K+
Users Reached
4-6
Engineers Led
3
Companies
GitHub Actions · 2m 43s
Live on Play Store
v2.4.1 · Updated today
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I build software that works — and teams that deliver.
I'm a Senior Mobile & Full-Stack Engineer with 9+ years building fintech, enterprise, and SaaS products across mobile, web, and backend. Primary stack is Flutter and Dart, with hands-on experience in React Native, React.js, Next.js, Node.js, and TypeScript.
My background also includes native Android (Kotlin, Java) and iOS (Swift), Clean Architecture/MVVM migrations, manual QA and test-case support, and technical leadership — owning CI/CD pipelines end-to-end and leading distributed teams while building scalable, production-grade applications.
I've turned fintech compliance and business requirements into software that actually ships, and worked AI tools like Claude and OpenAI Codex into day-to-day development — cutting manual effort and accelerating delivery on real client work.
Engineering Principles
Ship first, then refine
I bias toward delivery. Clean architecture and good DX are tools in service of getting real software into users' hands — not goals in themselves.
Depth earns trust
Flutter, React Native, React, Node.js, native Android and iOS — I've gone deep on each in production. That's what separates knowing a technology from trusting it under pressure.
Lead through the codebase
The fastest way to raise a team's quality is to set the standard in code — architecture reviews, clear conventions, pairing on the hard problems.
What I bring to the table
Cross-Platform Mobile
Flutter (primary) and React Native apps for Android & iOS — shipped to 10K+ users in production.
Full-Stack Web
React.js, Next.js, Node.js, TypeScript — end-to-end ownership from API design to production deploy.
AI-Assisted Development
Claude and OpenAI Codex worked into day-to-day development and client workflows in production.
Technical Leadership
Led remote teams of 4–6 engineers — code reviews, architecture calls, CI/CD ownership, and mentoring.
Currently
- Leading full stack and mobile delivery for fintech and SaaS clients
- Open to senior / lead remote engineering roles
- Working AI-assisted development into day-to-day workflows
Technical Expertise
Deep expertise across the full engineering stack — built over 9+ years of production delivery across mobile, web, backend, and AI systems.
Flutter
Primary
Dart
Kotlin
Java
Swift
React Native
Riverpod
State
BLoC Pattern
GoRouter
ObjectBox
ML Kit
BLE / BT
Clean Architecture
Strict separation of data, domain, and presentation layers for testable, maintainable systems.
SOLID Principles
Single responsibility, open/closed, Liskov substitution, interface segregation, dependency inversion.
Feature-based Architecture
Code organized by feature domain rather than file type — scales cleanly as products grow.
Scalable State Management
Riverpod, BLoC, Zustand — chosen per project complexity for predictable, testable state flows.
API-first Design
Contract-driven development: RESTful design, versioning, and documentation before implementation.
Authentication Systems
JWT, OAuth 2.0, biometric auth, session handling, and role-based access control in production.
Real-time Architecture
WebSocket-based live updates, Supabase Realtime, and Firebase listeners for reactive UIs.
Engineering Leadership
Code standards, architecture reviews, distributed team mentorship, and Agile delivery.
Work Experience
9+ years of progressive growth across fintech, enterprise, and AI-driven product engineering.
Senior Full Stack & Mobile Engineer
Cody Web and Development Inc.
- Pioneered the company's first Flutter project — a client-facing navigation app built with the project manager, bridge directors, and a backend engineer — now used by 10,000+ people across Android and iOS.
- Optimized the app to handle heavy, constant location updates, and implemented data-sync APIs using a modular approach, Clean Architecture, and test-driven development.
- Built an offline-first logistics app on a second project — data is stored locally first, then synced to the remote server as soon as connectivity returns.
- Delivered a SaaS, B2B web and mobile application on a separate fullstack project, working AI-assisted development into the implementation process.
- Own the CI/CD setup end to end (GitHub Actions, CodeMagic, Bitbucket) — moved the team from manual release steps to a near push-and-done workflow, cutting environment-related bugs.
- Set most of the TypeScript conventions the team follows now, helping new hires ramp up faster and keeping code consistent across projects.
- Lead a small remote team (4–6 engineers) — code reviews, architecture calls, and keeping quality consistent across the group. Also brought Claude and OpenAI Codex into a client's content workflow, cutting down a significant share of manual editorial work.
- Handle manual QA on parts of the system — running test cases handed off by the project manager or QA engineer, logging defects, and re-checking fixes before release.
Android Engineer
Cody Web and Development Inc.
- Built a project management and team collaboration application from the ground up in Kotlin, using MVVM and Clean Architecture alongside a senior Android developer.
- Developed real-time communication features — direct messaging, group chats, threaded conversations, mentions, reactions, and push notifications.
- Built the collaboration side of the app: project and task workspaces, personal and team to-do lists with task assignment, and workflow features like request/approval flows, ticket tracking, and shared team notes.
- Built document-handling features — image, video, PDF, and Office file uploads, previews, downloads, comments, and search — plus enterprise-facing pieces like guest access, surveys, and unified search across chats, files, and tasks.
- Worked on role-based access control and secure communication, and integrated cloud storage and third-party services for file sharing, notifications, and workflow automation.
- Handled API implementation, resolved performance issues, and fixed defects surfaced during QA testing.
Lead Android Developer
M. Lhuillier Financial Services
- Handled maintenance and new feature work across 3 in-house financial applications.
- Led the migration of the application architecture over to MVVM.
- Implemented specs handed down by project managers and product owners, and worked directly with QA to help build out test cases.
- Fixed backend bugs tied to financial and transaction-related issues — in fintech, these carry real financial risk if left unresolved.
- Owned the release process end-to-end for both the App Store and Google Play Store.
- Led a small team of 2–3 Android engineers — code reviews, resolving task conflicts, and delegating work to keep people from stepping on each other.
Featured Projects
Production apps, platform tools, and full-stack systems — shipped and live.
ONNOA - SmartTimer
Smart interval timer app for gym and workout sessions, built with Flutter using Clean Architecture. Fully offline — no internet or account needed. Features real-time camera-based motion detection and Bluetooth Low Energy (BLE) device connectivity for hands-free control.
Slotify
Multi-tenant appointment booking platform for service businesses. Customers book 24/7 via a public-facing page; owners manage operations through a dedicated dashboard.
TrackPoint
Flutter app that tracks device location at 5-second intervals and computes real-time distance to a fixed target using the Haversine formula, with a filterable readings history.
STS Sneaker Doctor
Full-stack sneaker retail platform — Flutter mobile app with QR/barcode scanning, Bluetooth receipt printing, inventory management, pre-order processing, and daily sales analytics. Paired with a web dashboard for business operations.
PokeAPI Apps
Pokédex built twice — a Flutter version with Clean Architecture, Riverpod, infinite scrolling, favorites, and full evolution chains; and a React Native/Expo companion app built with TypeScript and file-based routing.
Tocaro
No.1 team productivity and business communication platform with real-time messaging, file sharing, task management, and team collaboration tools. Shipped as a production-grade Android app in Kotlin.
Odekake EV
Japanese EV charging station navigation app helping electric vehicle owners find and route to charging stations across Japan. Built cross-platform with Flutter for both Android and iOS.
Let's build something great together.
Available for senior and lead remote engineering roles, AI integration projects, and technical consulting. If you're building something exciting, I'd love to hear about it.
Drop me a line
lariosajupilot1@gmail.com
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