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Open to Android & mobile leadership roles

Wesley Campagna

Android Tech Leader & Software Engineer

  • Tech Leader — MobileHST Card Technology
  • Co-founderecoNativas
  • Co-founderSonus App

Building scalable mobile experiences, payment systems and engineering teams.

  • Android
  • Kotlin
  • Jetpack Compose
  • Mobile Architecture
  • Technical Leadership
  • Java
  • Payments & Tokenization
  • Security
  • React Native
View experienceExplore tech stackLinkedInDownload CV
years in software engineering
7+
Based in
Padova, Veneto, Italy

UI layer

@Composable PaymentScreen()

Domain layer

class AuthorizeUseCase(...)

Data layer

TransactionRepositoryImpl

Platform & host

iso8583.send(request)

Architecture layers, shipped daily

Explore my profile by stack

Pick a professional focus. Experience, technologies and projects re-prioritise around it.

About

Engineering positioning

Software engineer with more than six years focused on the Android platform, currently leading a mobile team that ships payment SDKs and white-label applications across Latin America.

Day to day work means technical decision-making, architecture design (MVVM, MVP, MVI, modularization), code review and onboarding of new engineers — with a strong bias towards testability, maintainability and low post-release defect rates.

Beyond native Android I work with hybrid stacks (React Native, Flutter, Capacitor/Ionic, Cordova), native iOS and Swift, plugin development in JavaScript, TypeScript and Dart, plus Java backend integrations over REST and ISO 8583 hosts.

Payment engineering brought security into the centre of my practice: EMVCo compliance, cryptography, code obfuscation with ProGuard and DexGuard, secure storage and hardened SDK distribution.

Education

Bachelor's Degree in Computer Systems Analysis

Federal University of Mato Grosso do Sul (UFMS)

2015 — 2019 · Campo Grande, MS, Brazil

Languages

  • PortugueseNative
  • ItalianB1 → B2
  • EnglishB1
  • SpanishA2

Career

Experience timeline

Payments, mobile platforms and team leadership.

  1. Tech Leader — Mobile

    HST Card Technology

    08/2023 — present

    Campinas, SP, Brazil · Remote

    Current

    Technical leadership of the mobile team building payment products: Android decision-making, architecture design and cross-platform product definition for customers across the Americas.

    Responsibilities

    • Android technical leadership and decision-making across mobile projects.
    • Definition of products and plugins associated with the native iOS and Android platforms, including application flows.
    • Maintenance and facilitation for the team in Android projects, with active participation in feature definition.
    • Tokenization and secure transaction flows: contributing to increasingly fast and secure digitised payment experiences.

    Key achievements

    • Co-developed the company's best-selling product by volume together with the Product Leader, with an extremely low maintenance rate after release.
    • Introduced Kotlin Multiplatform Mobile and Jetpack Compose to the organisation together with the iOS Tech Leader.
    • Drove tool migration and updates toward market-leading solutions across the mobile codebase.

    Leadership

    • Team activity coordination and technical decision-making across mobile squads.
    • Mentor for onboarding and training of new employees.
    • Active participation in feature definition and the product development process.

    Technologies

  2. Android Development Analyst

    HST Card Technology

    09/2021 — 08/2023

    Campinas, SP, Brazil · Remote

    Payment SDKs built to market-leading security standards and delivered to customers across the American continent.

    Responsibilities

    • Native Android development with XML and Jetpack Compose, state handling with LiveData, State and Flow, Coroutines, Room, Retrofit and Firebase.
    • White-label applications and payment SDKs with EMVCo compliance, cryptography and obfuscation with ProGuard and DexGuard.
    • Plugins for client-dedicated services in React Native, Flutter, Cordova and Capacitor/Ionic, with continuous delivery of native iOS and Android solutions.
    • Build and distribution engineering: Gradle tasks, local and external Maven repositories, Jenkins pipelines, VMs and Bash scripting.

    Key achievements

    • Took part in the transition and modernisation of the team's tooling to market-standard solutions, contributing to project decisions.

    Technologies

  3. React Native Developer

    Rede Tendência

    12/2020 — 09/2021

    Campo Grande, MS, Brazil

    Hybrid mobile development with React Native for iOS and Android, maintaining and evolving the Vuon Card application of Grupo Pereira.

    Responsibilities

    • Maintenance and evolution of the Vuon Card application for Grupo Pereira, one of Brazil's largest food retail, cash & carry and private-label card groups.
    • Shared JavaScript codebase with native bridges for platform-specific behaviour on iOS and Android.

    Technologies

  4. Java Developer — Sales Force Automation

    Rede Tendência

    01/2020 — 09/2021

    Campo Grande, MS, Brazil

    Android applications for sales force automation and management in telecommunications product distribution, built in Java on an MVP architecture.

    Responsibilities

    • Java and MVP with Gradle, Retrofit, OkHttp3, Okio, Butterknife (progressively replaced by DataBinding) and Sprinkles for local persistence.
    • REST communication with a HOST system over the ISO 8583 standard, plus SyncAdapter with IPC for cross-process database access.
    • Android platform APIs: Services, Content Providers, Activities, Intents, Alarms, Push Notifications, Firebase, Google Maps and biometric (fingerprint) authentication.

    Key achievements

    • With the analyst team, reduced application errors by around 30% and open requests by around 80% by applying the Pareto principle to processes.
    • Delivered new features, modernised interfaces, refactored critical modules, standardised the application design and replaced deprecated functionality.

    Leadership

    • Mentored two new team members during this period.

    Technologies

  5. Intern — Software Tester

    Rede Tendência

    07/2019 — 12/2019

    Campo Grande, MS, Brazil

    Automated and manual testing of sales force management applications.

    Responsibilities

    • Test automation with Appium, Selenium, Capybara, Espresso, JUnit and Cucumber in Ruby, Java and JavaScript.
    • Automated the most important sales force flows in the Android application and its associated web application, improving the operational sector's work.

    Technologies

Leadership

How I lead engineering

Technical leadership expressed as engineering practice, not process theatre.

  • 01

    Technical decision-making

    Framing trade-offs explicitly — platform APIs, dependencies, delivery risk — and committing to a decision the team can defend six months later.

  • 02

    Architecture design

    Modular Android, MVVM/MVI boundaries and SDK contracts designed so features stay isolated and releases stay predictable.

  • 03

    Mentoring & onboarding

    Onboarding and training new engineers, pairing on real tickets and turning tribal knowledge into written standards.

  • 04

    Code review & standards

    Reviews that teach: naming, boundaries, error handling and test coverage over style bikeshedding.

  • 05

    Quality & testability

    Designing for testability up front; instrumentation, unit and UI tests protecting payment-critical paths.

  • 06

    Delivery & CI/CD

    Gradle tasks, Maven distribution and pipelines that make releasing an SDK a routine, reversible operation.

  • 07

    Technical debt management

    Tracking debt as a backlog with cost estimates, then paying it down alongside feature work instead of in mythical rewrite sprints.

  • 08

    Developer experience

    Faster builds, clearer module graphs and tooling migrations toward market-leading solutions.

Projects

Selected work

Products and platforms shipped in production.

Payment SDK Suite

In production

Role: Technical Leader & Android Engineer

Payment SDKs and white-label applications delivered to clients across multiple Latin American countries, compliant with top market security standards.

Challenge
Distributing hardened, versioned SDKs through local and external Maven repositories while keeping EMVCo compliance and a very low post-release defect rate.
Architecture
Modular Android · MVVM · Gradle publishing · ProGuard/DexGuard

Cross-platform Payment Plugins

In production

Role: Plugin Architect & Developer

Client-dedicated plugins exposing native iOS and Android payment capabilities to React Native, Flutter, Cordova and Capacitor/Ionic applications.

Challenge
One native contract, four bridge runtimes: keeping a single API surface stable across JavaScript, TypeScript and Dart consumers.
Architecture
Native module bridges · Shared API contract · Semantic versioning

Vuon Card — Grupo Pereira

Shipped

Role: React Native Developer

Card application enabling purchase monitoring, contract tracking and in-app purchase of digital services. Developed and launched to production within an 8-month window and still active today.

Challenge
Delivering a production-grade retail finance app on a fixed deadline for one of Brazil's largest food retail groups.
Architecture
React Native · Native bridges · REST integration

Sales Force Automation Platform

Handed over

Role: Java / Android Developer

Field sales automation apps for telecommunications distribution, integrating with a HOST system over ISO 8583 and syncing offline data across processes.

Challenge
Reliable offline-first synchronisation on low-end devices with intermittent connectivity.
Architecture
MVP · SyncAdapter + IPC · Content Providers

e-Cattle

Shipped

Role: University Project — Mobile & Systems Developer

Academic research and development project at UFMS focused on digital cattle management: livestock tracking, herd data and field-oriented tooling for rural producers.

Challenge
Designing usable software for rural environments with limited connectivity, while turning academic requirements into a shippable product.
Architecture
Web + mobile clients · REST services · Offline-tolerant data capture
e-Cattle →

ecoNativas

In production

Role: Co-founder & Technical Lead

Co-founded a sustainable products venture and built its online store end to end — storefront, catalogue, checkout flow and the infrastructure that runs it.

Challenge
Running product, engineering and operations at once: a small, self-hosted stack that stays cheap, secure and fast enough for real customers.
Architecture
Next.js storefront · Node.js services · Docker + Portainer · Kong gateway
ecoNativas →

Sonus App

In development

Role: Co-founder & Mobile Architect

Application for musicians and ensembles to manage concerts and sheet music — repertoire, scores, rehearsal and performance planning. Currently in pre-release, close to store deployment.

Challenge
Handling large score files offline on mobile while keeping concert data in sync between musicians and organisers.
Architecture
Kotlin + Compose · MVVM · Node.js API · Offline-first storage

Tech stack

Technology explorer

Grouped by domain, labelled by depth of real usage — not percentages.

Depth of experiencePrimaryAdvancedProfessional experienceWorking knowledgeExploring

Architecture

How I structure systems

Patterns applied to production mobile and payment codebases.

  1. UI layer

    layer 1

    Compose / XML screens, state holders, navigation

    • :compose-ui
    • :navigation
    • :state-holders

  2. Domain layer

    layer 2

    Use cases, entities, business rules — framework free

    • :use-cases
    • :entities
    • :policies

  3. Data layer

    layer 3

    Repositories, Room, Retrofit, secure storage

    • :repositories
    • :room
    • :retrofit

  4. Platform & host

    layer 4

    SDK bridges, ISO 8583 host, Firebase, native modules

    • :sdk-bridge
    • :iso-8583
    • :firebase

  • Modular Android

    Feature and core modules with explicit Gradle boundaries, enabling parallel builds and white-label composition.

  • MVVM / MVI

    Unidirectional state with Flow and StateFlow; predictable rendering and testable state transitions.

  • MVP pattern

    Presenter-driven Android screens on legacy Java codebases, kept testable while migrating incrementally towards MVVM.

  • Dependency injection

    Constructor injection and module-scoped graphs so implementations stay swappable in tests.

  • API & SDK contracts

    Versioned, backwards-compatible surfaces consumed by native, React Native, Flutter and Capacitor clients.

  • Testing strategy

    Unit tests for domain, instrumentation for persistence, Espresso and Appium for critical flows.

  • Offline-first sync

    SyncAdapter, IPC and content providers keeping field applications usable without connectivity.

Cybersecurity

Security as an engineering constraint

Payment engineering means the threat model is part of the design review, not an audit afterthought.

  • Secure coding

    Input validation, safe defaults and least privilege inside SDK boundaries.

  • EMVCo & compliance

    Payment SDKs built and delivered under top market security standards.

  • Encryption

    Encrypted payloads and keys at rest and in transit across host integrations.

  • Hardening

    ProGuard and DexGuard obfuscation for distributed white-label binaries.

  • Authentication

    Biometric authentication and device-bound credentials on Android.

  • Secure storage

    Protected local persistence for sensitive transactional data.

  • Secure communication

    Hardened REST and ISO 8583 host channels.

  • OWASP Mobile awareness

    Reviewing releases against common mobile risk categories.

// release checklist — payment SDK
✓ obfuscation      proguard + dexguard rules verified     // advanced
✓ keys             no secrets in the APK / AAR            // always
✓ transport        certificate pinning on host channel    // always
✓ storage          encrypted local persistence            // always when needed
✓ auth             biometric prompt + device binding      // yes
✓ review           threat model revisited before tagging  // yes

Contact

Let's talk engineering

Available for Android leadership, mobile architecture and platform roles.

Location
Padova, Veneto, Italy

Curriculum Vitae

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