Backend · Mobile · Product

Andrés Podadera

Backend & Mobile Software Developer

I build secure, maintainable product features — from APIs, data and business rules to Android/Kotlin experiences and production-ready mobile flows.

Kotlin · Java · Spring Boot · Android · Kotlin Multiplatform

Professional experience with React Native and TypeScript.

View projects Download CV

Professional product experience
Kotlin Multiplatform · Android + iOS
Published on Google Play
Backend, security and transactional workflows

Professional experience

Experience building products

I work on secure user flows, device integrations, and maintainable frontend/mobile architecture.

Full Stack & Mobile Developer

Remittven

Spain / Remote

July 2025 – Present

Develop and maintain secure mobile flows for authentication, onboarding and user verification.
Implemented biometric and device-credential authentication for sensitive actions, with safe fallback and secure credential storage.
Refactored regional configuration and locale handling into a reusable solution, reducing duplicated behavior across flows.
Worked on integrations and frontend/mobile component evolution, keeping product validation, security and maintainability in view.

React Native
TypeScript
Android
Kotlin

Capabilities

What I can own in a product

A combination of backend, mobile and engineering practices applied to product work.

Backend & business logic

APIs, authentication, persistence, validation, business rules, payments and transactional workflows.

Mobile product

Android/Kotlin, Kotlin Multiplatform, offline behaviour, biometrics and device integrations.

Delivery & quality

Testing, CI/CD, Docker, technical documentation, basic observability and decisions focused on security and maintainability.

Selected stack

A compact technical foundation

Core

Kotlin
Android
Java
Spring Boot
PostgreSQL

Engineering

REST APIs
Testing
Docker
GitHub Actions
Clean Architecture
CI/CD

Additional experience

TypeScript
React
Angular
React Native
Firebase
Laravel

Selected work

Featured work

Projects showing technical decisions across mobile products, backend systems and SaaS.

Featured project

NutriSport

Sports-nutrition e-commerce for Android and iOS built with Kotlin Multiplatform and Compose Multiplatform.

Engineering evidence

Shared modular architecture across Android and iOS, separating domain, data, navigation, dependency injection and features.
Offline-first reads using Firestore persistence, image caching and platform-specific connectivity monitoring.
Backend-managed checkout through Firebase Functions, preventing the client from directly writing final orders.
Automated testing and CI/CD validation for Android builds.

Kotlin Multiplatform
Compose Multiplatform
Firebase
Ktor
Koin
GitHub Actions

Technical case study View repository View on Google Play

Project context

Problem

The application needed cross-platform customer and seller/admin flows while remaining useful with limited connectivity.

Solution

Shared mobile modules connect the application to Firebase services and backend-managed checkout flows.

Featured project

CashTracker

Personal-finance SaaS with transactional operations, subscriptions and AI-assisted workflows.

Engineering evidence

PostgreSQL financial operations protected with transactions and pessimistic locking to prevent concurrent inconsistencies.
Monthly and yearly subscriptions using Stripe Checkout, Billing Portal and webhook validation.
Account and sensitive-operation protection through authorization, rate limiting, email verification and password recovery.
Pest/PHPUnit testing, including PostgreSQL-specific behaviour where required.

Laravel
PostgreSQL
React
TypeScript
Stripe
Pest

Technical case study View repository

Project context

Problem

Budget and expense operations require ownership checks and concurrency-safe limits, while paid features need a reliable billing flow.

Solution

The application coordinates authorization, transactional writes, subscriptions and a localized web interface.

Featured project

Events API

REST API for events, categories and speakers with authentication, security, validation, pagination and contract documentation.

Engineering evidence

Spring Security with JWT and role-based authorization.
Spring Data JPA with PostgreSQL/H2, pagination and Bean Validation.
DTO mapping with MapStruct and OpenAPI/Swagger for explicit contract documentation.
Identification and resolution of the JPA N+1 pattern through targeted JOIN FETCH queries.

Java
Spring Boot
Spring Security
Spring Data JPA
PostgreSQL
MapStruct
OpenAPI
Docker

View repository

Project context

Problem

The API needed to manage related resources securely and return predictable collection responses.

Solution

A Spring Boot API organizes controllers, services, repositories, DTO mapping and security around the domain.

Secondary projects

Secondary project

Book Social Network

Formative full-stack book social network project with an Angular frontend and Spring Boot backend.

Separate Angular frontend and Spring backend.
JWT, email validation and lending logic in the domain.

Angular
Spring Boot
Spring Security
JWT
Docker

View repository

Contact

Let’s talk.

I’m open to backend and mobile opportunities, especially in products where I can contribute to architecture, security, APIs and mobile experiences.