Senior Mobile & Full Stack Engineer
Doron Elisha
Remote • Brazil (UTC-3) • Contract & Senior Remote Roles
Mobile-focused full stack engineer building production apps end-to-end — from architecture and backend systems to App Store and Play Store release. 10+ years shipping Native Android, React Native, and Unity products used by millions of users.
Profile
Senior engineer specializing in mobile-first product development using React Native, Android, Unity, and scalable backend systems. Experienced delivering production software end-to-end — architecture, implementation, release, monitoring, and iteration.
Comfortable leading small teams, mentoring developers, and working directly with founders and product stakeholders to move ideas into shipped products. Strong focus on reliability, performance, and fast iteration cycles.
Building systems that survive real users, real scale, and real deadlines.
Selected Systems & Projects
Mobile Apps & Games Platform
Built and shipped multiple mobile applications and Unity games with shared backend infrastructure using Firebase and Node.js. Designed authentication, analytics, remote config, and live update flows supporting millions of installs.
Enterprise Payment SDK
Developed Android SDK integrations for enterprise partners, focusing on reliability, performance, and scalable API design using NestJS and PostgreSQL.
CMS-Driven Content Platform
Designed backend dashboards and content systems enabling non-technical teams to control live app content without releases.
What I Bring to a Team
- End-to-end ownership from idea to store release
- Mobile-first architecture decisions
- Fast startup iteration with production stability
- Firebase & serverless backend expertise
- AI API integration into real products
- Strong debugging and production problem solving
Technical Skills
Front and mobile
React, React Native, Android (Kotlin/Java), Unity, animation systems, mobile performance optimization.
Backend & Infrastructure
Firebase (Auth, Firestore, Functions, Remote Config), Node.js, NestJS, PostgreSQL, MongoDB.
Delivery & Tooling
GitHub Actions, EAS builds, CI/CD pipelines, Crashlytics, Sentry, store deployments.
AI Integration
OpenAI APIs, AI automation workflows, AI-assisted development pipelines.
Professional Experience
Goldtusks — Senior Full Stack Engineer
Led development of mobile apps and Unity games reaching millions of users. Built backend systems, authentication flows, analytics platforms, dashboards, and internal tooling supporting continuous delivery.
Sensepass — Backend & Mobile Developer
Designed Android SDK integrations and developed high-performance NestJS APIs. Migrated backend infrastructure from MongoDB to PostgreSQL.
Bank Hapoalim — Senior Android Developer
Delivered production features for one of Israel’s largest banking apps while mentoring developers and coordinating Agile delivery as team lead and scrum master.
SportArena — Android Developer
Built complex integrations and improved application UX through rapid startup iteration.
EchoT Green Paper — Android Developer
Developed resilient Android TV platform with CMS-controlled content and strong offline reliability.
Let’s build something users love and teams are proud to ship.
Currently Interested In
Remote senior engineering roles or long-term contracts involving mobile platforms, AI-powered applications, interactive products, or game-adjacent systems.