Software Engineer · System Architect · Team Lead

Software engineer focused on designing and building modular, scalable, and business-driven systems.
Strong background in backend development, distributed architecture, automation, and enterprise platforms.

• Backend & APIs
  Design and development of robust REST services using .NET 8, ASP.NET Core, Entity Framework, Dapper, and SQL Server.

• System Architecture
  Clean Architecture, Repository Pattern, modular APIs, and API gateways with Ocelot.

• Automation & Asynchronous Processing
  Schedulers, background jobs, and workflow orchestration using Hangfire, Quartz.NET, and Windows Services.

• Frontend & Desktop Applications
  Web and desktop solutions built with Angular, React, WinUI 3, and Razor Pages.

• Mobile Development
  Android and iOS applications using Flutter, integrated with Firebase or Supabase.

• Data & Performance
  SQL performance tuning, reconciliation engines, data consistency, and operational indicators.

• Security & Authentication
  Active Directory integration, JWT, OAuth2, and role-based access control (RBAC).

• Blockchain
  Smart contract development in Solidity, including ERC20 tokens, staking, governance, and bridge compatibility.

• Workflow & API Integrations
  Automation and integrations with Microsoft Graph API, Google APIs, and external services.

Architected and developed a large-scale enterprise platform for payment processing, order reconciliation, and automation.
Focused on microservices, job orchestration, data consistency, and security.
Stack: .NET 8, Entity Framework, SQL Server, Hangfire, Quartz.NET, Ocelot.

Designed a distributed travel management system composed of multiple APIs (Users, Trips, Destinations, Admin, Gateway).
Implemented clean architecture, cross-service communication, and secure token-based authentication.
Stack: .NET 8, PostgreSQL, Entity Framework, Ocelot, JWT.

Developed a WinUI 3 desktop application for wellness reminders, including hydration, posture, and eye breaks.
Implements scheduling, notifications, and persistent local storage.
Stack: .NET 8, MVVM, system tray integration.

Developed an ERC20 token in Solidity with staking, role-based access control, governance, and bridge compatibility.
Used Hardhat, OpenZeppelin, and Ethers.js for deployment and testing.

Hackathon project developed in a short time frame using Node.js and Gemini AI.
Built autonomous digital agents for retail analytics and content generation.

Cross-platform Android and iOS prototype focused on user matching and anonymous interaction.
Includes authentication, real-time data sync, and swipe-based UI patterns.
Stack: Flutter, Firebase.

Curious by nature.
Driven by structure.
Continuously learning, from distributed systems to applied AI.

Outside of software development, I enjoy hiking, astrophotography, and building tools that improve everyday workflows.

• Website: https://helderpereira.dev
• LinkedIn: https://linkedin.com/in/helderpereira
• Email: [email protected]