Nathan Almeida

Backend engineer with 8+ years building and scaling PHP platforms in payments, e-commerce, real estate, automotive and the public sector. CTO of Luna Checkout since 2022, owning architecture for a multi-tenant checkout SaaS with its own payment, fraud and shipping layers.

Technical

Lead at Time System, setting code review, CI/CD and shared-package standards for the engineering team. Seeking a hands-on Senior Backend / PHP role on a remote-first product team.

Co-founder & CTO at Luna Checkout (2022 – Present)

• Architected Luna Checkout, a multi-tenant checkout and store-builder SaaS, with a CodeIgniter 4 REST API and a Next.js storefront, owning technical strategy across the product ecosystem.
• Built LunaPag, a payment orchestration layer over Pagar.me and Mercado Pago (cards and PIX), using webhook signature validation and idempotency keys to keep order state consistent across gateways and chargebacks.
• Designed a pre-capture fraud screening pipeline combining CPF validation (Infosimples API), phone-pattern detection and velocity checks to block suspicious orders before payment.
• Built LunaEnvios, the shipping layer, and order dispatch to Bling ERP; delivered electronic content declaration (DC-e) emission via XMLDSig and SOAP 1.2 against SEFAZ ahead of the 2026 regulatory deadline.
• Implemented server-side Meta Conversions API tracking with per-store request logging, giving merchants purchase attribution that survives ad blockers and in-app WebViews.
• Run production on DigitalOcean with Docker and Dokploy/Traefik, self-hosted SSO (Zitadel) and mesh VPN (NetBird); harden releases with OWASP ZAP, Nuclei and Psalm taint analysis.

Technical Lead | Senior PHP Developer at Time System (2024-10 – Present)

• Lead a backend team delivering REST APIs in Laravel and CodeIgniter 4 for process automation, owning architecture decisions and code review standards.
• Created a private Composer package suite (tsigniter/*) to standardize shared CodeIgniter 4 code, removing duplicated logic across projects.
• Built an AI-powered GitHub Actions PR review bot that checks CodeIgniter 4 conventions automatically, shortening review cycles.
• Implemented CI/CD pipelines with automated SemVer releases and SonarQube PR decoration, catching quality issues before merge.
• Mentor developers through code reviews and pairing on architecture and testing practices.

Technical Lead at Why Digital (2023-06 – 2024-10)

• Led technical delivery of web platforms and REST APIs for real estate and vehicle-protection clients, defining scalable architecture in Laravel and CodeIgniter 4.
• Introduced CI/CD pipelines and code quality standards that kept delivery stable through the company's transition into Time System.

Mid-Level PHP Developer at Why Digital (2019-09 – 2023-06)

• Built web platforms and hybrid/PWA mobile apps (CodeIgniter, Ionic) for real estate and vehicle-protection products, owning features from requirements to deployment.
• Integrated third-party APIs with a focus on performance and usability; promoted to Technical Lead for consistent delivery and technical ownership.

Junior Systems Analyst – Backend (Node.js) at Grupo TCS – Technologies & Creative Solutions (2019-05 – 2019-09)

• Developed Node.js and SQL Server services for parts monitoring and tracking at an automotive manufacturer, supporting logistics and production control.

PHP Developer at Fundação de Ensino de Contagem (Funec) (2017-02 – 2019-05)

• Built and maintained public-sector recruitment systems, including verification, audit and workflow-control modules for candidates and administrators.

Undergraduate Degree in Systems Analysis and Development – Estácio (2019 – 2024)

Technical Degree in Information Technology – Fundação de Ensino de Contagem (Funec) (2014 – 2016)