Alex Ferreira

About

Hands-on Solutions Architect, delivering software independently since 2017 building marketplaces, internal tools, AI workflows and integrations working with SMEs, Startups and SMBs for B2B solutions. Extensive experience in cloud engineering, software development, and technical leadership, particularly in AI, distributed systems, and IoT solutions. Reach me @ https://lexworks.dev

Experience

• Cloud Engineer · Lexworks Solutions2025-11-01 –

  Collaborating directly with business owners to deliver innovative tech businesses end-to-end.

• Technical Lead · Problem Company2022-01-01 – 2025-11-01

  Led operations for a software agency. I architected and engineered high-throughput distributed systems and billing platforms for bootstrapped startups, overseeing the full lifecycle from system design to production deployment on AWS. • Designed a subscription billing engine handling complex multi-tenancy, proration logic, and dunning management, integrating directly with Xero and Stripe Connect. • Managed cloud security governance for regulated industries, successfully mitigating a critical root-credential compromise and implementing a least-privilege IAM architecture that recovered over $20,000 in lost funds. • Implemented a document processing pipeline using AI and event-driven architecture, reducing processing time from 4 minutes to under 10 seconds per transaction. • Led technical strategy and coordinated parallel development streams by mentoring and managing external engineers, serving as the primary technical partner for business owners to translate commercial goals into deployed software. • Audited a client's failing subscription system, identifying silent billing failures and recovering $40,000+ in missed revenue by diagnosing race conditions in state management and implementing automated reconciliation SQL queries. • Delivered a fully operational IoT platform with AI integration under a strict 30-day fixed deadline, utilizing a parallel execution model and strict API contract verification to prevent timeline slippage.

• Senior Software Engineer · Inflewental2021-05-01 – 2021-12-01

  Implemented a campaigns management solution integrated with Google Ads, from services to UI. Set up CI/CD with GitHub Actions; deployed microservices to Kubernetes with centralized secrets management. Managed several releases with HELM. Built services in Go and Node/TypeScript; delivered a Next.js frontend with SEO optimizations. Integrated with Directus. Developed an open-source HELM chart that allowed plugins to be deployed to containerized Directus. Created a visual “forms service” with a canvas for decision-tree flows, allowing marketers to design complex interactions; implemented runtime state management for end users with step-based pixel tracking. Used AWS, PostgreSQL, and NoSQL stores to support scale and reliability.

• Software Engineer · ForeShop Group2021-01-01 – 2021-04-01

  Designed and delivered an AVOD (Advertising-Based Video on Demand) platform to run and manage ad-supported video across a large website network. Built a TypeScript + MongoDB service with object storage for video, and a React console for content and ad configuration. Developed an embeddable SDK for partner sites; implemented CDN-backed delivery, DNS, and networking on DigitalOcean. Optimized WordPress template properties for performance and stability; resolved critical production issues. Extended a Go library to register placements and manage ad inventory across the network.

• Web Developer · Strongbelts2020-05-01 – 2020-08-01

  Led a fast-track storefront launch using Saleor and React, from prototype to production. Implemented the React/Apollo GraphQL frontend and Stripe checkout, owning UX and UI for a clean buyer flow. Spearheaded Saleor integration and configuration to meet catalog, checkout, and fulfillment requirements.

• Software Developer · Adspen2019-09-01 – 2020-04-01

  Designed and implemented multi-tenant authentication and authorization (RBAC) for organizations and users. Integrated Stripe and Chargebee to automate subscription billing, invoicing, and payment management. Built microservices in Go and Python with a React portal; exposed REST/GraphQL APIs for campaign management and a cross-browser extension. Ingested campaign analytics via third-party APIs (including Facebook) to surface performance insights. Containerized services with Docker/Compose and Envoy; implemented a custom tracking pixel and notifications pipeline. Worked with PostgreSQL, Firebase, and GraphQL to support reliable, scalable data access.

• Software Developer · Inflewental2017-07-01 – 2018-09-01

  Shipped core backend and frontend for a PaaS connecting influencers and sponsors, including onboarding, campaign management, and sponsor request flows. Built third-party integrations (e.g., Twitch) and authentication, enabling seamless creator sign-ups and campaign execution. Worked end-to-end across Firebase, Node.js/Express, TypeScript, and Angular in a lean team partnered with a lead engineer. Partnered with business stakeholders to translate campaign and onboarding requirements into incremental releases.

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