Alex Ferreira
Verified Expert in Engineering
Software Architect and Developer
Goiânia - State of Goiás, Brazil
Toptal member since March 23, 2026
Alex is a hands-on software architect who works primarily with SMBs, startups, and MSPs to ship mission-critical B2B solutions. As a former CTO of a software agency, he specializes in end-to-end delivery. Alex derisks plans, projects solutions that enable business-driven decisions (CAPEX vs. OPEX trade-offs, timelines, deliverables), and enables teams for scalable continuity.
Portfolio
Experience
- TypeScript - 8 years
- End-to-end Implementation (E2E) - 8 years
- Startups - 8 years
- Amazon Web Services (AWS) - 6 years
- Go - 6 years
- Feature Roadmaps - 5 years
- Multi-tenant SaaS - 5 years
- Billing Systems - 5 years
Preferred Environment
Linux, Amazon Web Services (AWS), Go, TypeScript, Terraform, GitHub Actions, Serverless, Serverless Architecture, Startups, Minimum Viable Product (MVP)
The most amazing...
...of my accomplishments is scaling a software agency as CTO with a lean cross-functional team, servicing 4+ concurrent SMB and enterprise projects over 4 years.
Work Experience
CTO
Problem
- Led operations for a software agency as CTO, architecting, coordinating, and implementing the critical path for mission-critical B2B systems.
- Achieved an over 95% customer retention rate across 5 projects in 4 years in collaboration with 7 cross-functional team members.
- Designed and implemented subscription billing engines handling complex multi-tenancy, proration, and MSP domain logic, integrating them directly with Xero and Stripe Connect.
- Inherited and pivoted a legacy form management application into a successful AI-driven intelligent document processing platform, reducing compliance document processing time from 4 minutes to under 10 seconds.
- 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.
- 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.
Software Engineer
Foreshop Group
- Designed and delivered an advertising-based video on demand (AVOD) platform to run and manage ad-supported video across a large website network.
- 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.
- Built a TypeScript and MongoDB service with object storage for video, and a React console for content and ad configuration.
Senior Software Engineer
Inflewental
- 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.
- Built services in Go, Node.js, and TypeScript. Delivered a Next.js front end with search engine optimizations (SEOs).
- Set up CI/CD with GitHub Actions. Deployed microservices to Kubernetes with centralized secrets management. Managed several releases with Helm.
- Integrated with Directus and developed an open-source Helm chart, enabling plugins to be deployed to containerized Directus environments.
- Utilized AWS, PostgreSQL, and NoSQL stores to support scale and reliability.
Web Developer
Strongbelts
- Led a fast-track storefront launch using Saleor and React, from prototype to production.
- Implemented the React/Apollo GraphQL front end 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
Adspen
- 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
Inflewental
- Shipped the core back end and front end for a SaaS 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.
Experience
B2B Multi-tenant SaaS for MSP
https://lexworks.dev/blog/multi-tenant-license-distribution-platformIntelligent Document Processing Platform for Land Surveying Firm
https://lexworks.dev/blog/b2b-intelligent-document-processing-land-surveyingVideo Marketplace SaaS with Streaming and Community Features
https://lexworks.dev/blog/creator-platform-streaming-communityBuilding an AI-powered Energy Management Platform for VC in 30 Days
https://lexworks.dev/blog/iot-energy-management-platformCertifications
AWS Solutions Architect Associate
Amazon Web Services
Skills
Libraries/APIs
React, Stripe, Stripe Connect, Xero API, CanvasJS, Facebook API, Node.js, Google Analytics API, Stripe API, Twitch API, Intercom API, OpenAPI
Tools
Terraform, Xero, Docker Compose, RabbitMQ, Helm, Google Analytics, Envoy Proxy, Keycloak, Forum Software, Retool, Cron, Expo
Languages
Go, TypeScript, Python 3, Bash, TypeScript 4, JavaScript, SQL, GraphQL, Ruby, TypeScript 5
Paradigms
Requirements Analysis, DevOps, Serverless Architecture, Agile, Marketplace Platforms, Agile Project Management, Event-driven Design (EDD), Real-time Systems
Platforms
Amazon Web Services (AWS), Azure, Kubernetes, Docker, Directus, WordPress, WooCommerce, DigitalOcean, Saleor, Firebase, AWS Lambda, Linux
Frameworks
OAuth 2, Next.js, Angular 2, Angular, Express.js, Video.js, JSON Web Tokens (JWT), React Native
Storage
Relational Databases, MongoDB, PostgreSQL, Data Synchronization, AWS Elemental
Other
AWS Cloud Architecture, Startups, Minimum Viable Product (MVP), Full-stack, End-to-end Implementation (E2E), Software Architecture, Cloud Architecture, Cloud Engineering, IT Project Management, Artificial Intelligence (AI), Multi-tenant SaaS, Serverless, Process Mapping, Feature Roadmaps, Containers, AWS DevOps, Content Management Systems (CMS), Cross-functional Coordination, GitHub Actions, CI/CD Pipelines, Digital Solutions, Custom Solutions, Open Source Customization, Sales Engineering, Business to Business (B2B), Internet of Things (IoT), Vendor Management, Technical Hiring, Technical Design, Software Design, Accounting Software Design, Accounting Software, Billing Systems, Billing Software, Video on Demand (VOD), Multi-tenant Architecture, Marketplaces, Managed Services, Enterprise Startups, SaaS, Distributed Software, Payment APIs, Subscriptions, Third-party APIs, Third-party Integration, App Support, Relational Database Design, Relational Database Services (RDS), Forms, SEO Tools, Headless Commerce, Headless CMS, Headless Software, Checkout, eCommerce, Advertising, Server-side Tracking, Envoy Gateway, Chargebee, Web Extensions, Social Media Campaigns, Email Automation, Looker Studio, Optical Character Recognition (OCR), Machine Learning, ChatGPT API, Document Processing, Strapi, Supabase, Supabase Auth, Discourse, Forum Design, Real-time Data, Big Data Architecture, WebSockets, Real-time Streaming, Video Transcoding, AWS Elemental MediaLive, AWS Elemental MediaConvert, Transcription, ADA Compliance, Social Networks Development, Instant Messaging, Digital Product Development, Request for Proposal (RFP), RFPs, RFQs, ITTs, Responses, Proposals & Quotes, RFPs, Azure Function App, Code Generators, Third-party Risk, Weather, Datasets, Caching, Azure Service Bus, Data Visualization, Analytics, Proof of Concept (POC)
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