HPhelderpereira.dev

HELDER PEREIRA

Leading engineering efforts in enterprise operations, backoffice workflows and modular .NET platforms.

Engineer with 7+ years building mission-critical internal platforms in retail. Experienced in backend architecture, platform ownership and cross-team technical leadership, with a focus on operational workflows, reconciliation, governance and modular service design.

Let's talkTools labLinkedInGitHub
  • 7+ yearsIndustry experience

    Enterprise & retail tech

  • Enterprise-scalePlatforms delivered

    Ops & governance

  • Cross-teamTechnical leadership

    Engineering & product

  • Scalable designCore strengths

    Reliability & clarity

helderpereira.dev
const helder = {
  role: "Principal Software Engineer",
  location: "Porto, Portugal",
  stack: [
    "C# / .NET 8",
    "TypeScript / Angular",
    "React",
    "Azure + GitHub Actions",
    "SQL Server",
    "Jira"
  ]
};
Open to remote-first staff+ roles, platform ownership and technical advisory engagements.

Stack

Stacks I rely on

I combine strong engineering fundamentals with modern DX practices to unblock teams and roadmaps.

languages

  • C#
  • TypeScript
  • JavaScript
  • SQL / T-SQL

frameworks

  • ASP.NET Core
  • .NET 8
  • Entity Framework Core
  • Angular
  • React
  • WinUI 3

platforms

  • Azure
  • Azure DevOps
  • SQL Server
  • PostgreSQL
  • Cloudflare R2
  • Microsoft Graph

tooling

  • Git
  • VS Code
  • SSMS
  • Azure Data Studio
  • Postman / Insomnia
  • Docker
  • Node.js / npm

design

  • Penpot
  • Figma

automation

  • GitHub Actions
  • Hangfire
  • Quartz.NET
  • n8n

Experience

Recent impact

Jan 2022 – Present

Porto, Portugal

Senior Software Engineer / Tech Lead

Sonae

  • Designed and evolved a large-scale internal operations portal supporting credit, collections, reconciliation, document governance and backoffice workflows.
  • Architected end-to-end .NET modules with strong reliability, observability and integration patterns across business units.
  • Introduced engineering standards including monorepo structure, quality gates, branching strategies and CI/CD pipelines.
  • Defined multi-tenant authentication models, reusable API patterns and platform-wide governance rules.
C#.NET 8ASP.NET CoreAngularReactSQL ServerAzure

May 2018 – Dec 2021

Porto, Portugal

Software Engineer

Sonae

  • Developed microservices for credit, risk and compliance with automated testing and centralized logging.
  • Built document management and permissions modules integrated with Active Directory and SSO.
  • Optimized SQL Server and Oracle workloads, reducing operational and licensing costs.
  • Migrated legacy portals to modern .NET and React architectures with structured rollout strategies.
C#ASP.NET CoreSQL ServerReactRabbitMQOracle

Projects

Selected work

Order & Payment Reconciliation Module

Company context

Module within a broader backoffice platform that matches online and in-store orders with their respective payment records (MB, MBWay, card and alternative methods).

Improves financial and operational accuracy with automated matching, exception handling and audit-ready visibility.

C#.NET 8ASP.NET CoreSQL ServerHangfireAzure

Enterprise Operations Portal

Role overview

Large-scale internal portal consolidating credit, collections, document governance, reconciliation and workflow automation across multiple business units.

Provides a central operational backbone with consistent UX, modular APIs and reliable process orchestration.

C#.NET 8ASP.NET CoreAngularSQL ServerAzure DevOps

API Gateway & Authentication Layer

Architecture overview

Central routing and authentication layer providing JWT-based SSO, request governance, rate limiting and service integration.

Standardized identity and integration flows across internal platforms, improving reliability and onboarding speed.

C#.NET 8ASP.NET CoreOcelotJWTActive DirectorySQL Server

TV Dashboards & Digital Signage Platform

Work in progress

Multi-tenant platform delivering real-time KPIs, alerts, branding and content to TV screens in offices and stores.

Expanded operational visibility with customizable layouts, dynamic data sources and low-maintenance deployment.

C#.NET 8ASP.NET CoreAngularSQL ServerDocker

NotifyMe – Productivity Assistant

View code

Windows desktop app providing configurable reminders for hydration, breaks, eye health and wellbeing.

Helps users maintain structured routines via lightweight notifications, local storage and system tray integration.

.NET 8WinUI 3SQLiteC#

Travel & Booking Microservices

Personal R&D

Modular architecture for a travel platform supporting trip planning, bookings, payments and white-label deployment.

Defined service boundaries, integration flows and relational data models for a future scalable SaaS product.

C#.NET 8ASP.NET CorePostgreSQLDocker

Contact

Let's build something developers enjoy maintaining.

Available for technical leadership, platform consulting and DX / DevOps audits.

Email meGitHub