07/28/2026 updated
100 % available
AI-Assisted Software Developer & SaaS Product Builder
Portimão, Portugal
Only remote
Marketing and Business AdministrationAbout me
Hands-on AI-assisted software developer and sole creator of TrustSender.io, a production B2B SaaS. I build, document, test and deploy scalable solutions, translating business needs into reliable software. Available for freelance and short-term projects across Portugal and Spain.
OIDCGitHub ActionsAuthentication ProtocolsContinuous DeliveryContinuous IntegrationDistributed SystemsPostgreSQLSoftware ArchitectureNext.jsStripeFront End Software DevelopmentApi DesignApi Management
Hands-on SaaS Development
Governed AI Software Delivery
API & Platform Integration
Distributed Architecture & Scalability
Testing & Maintainability
Modular Code & Documentation
GitHub, CI/CD & Deployment
Resilience, Security & Compliance
Requirements & Delivery
Independent conception, architecture, implementation and production delivery of TrustSender.io, a B2B SaaS platform built from initial business requirements and system sketches to an operational product. Experience across application flows, APIs, data, authentication, billing, distributed processing, deployment and production operations.
Governed AI Software Delivery
Use of AI to accelerate implementation while preserving engineering discipline. Changes are scoped, reviewed, tested and documented before production use, with explicit acceptance criteria, invariants, authorised files and regression controls.
API & Platform Integration
Design and implementation of 63 API operations covering authentication, accounts, billing, validation jobs, status, outputs, usage, support, administration and internal worker communication. Integration of PostgreSQL, Google and Microsoft authentication, Stripe checkout, secure sessions, signed webhooks and transactional services.
Distributed Architecture & Scalability
Development of a remote execution architecture separating the central control plane from isolated validation workers. Includes authenticated leases, capacity limits, heartbeat telemetry, worker provisioning, horizontal expansion, lifecycle control and canonical output management.
Testing & Maintainability
Repository containing 4,651 lines of test code across 33 test files. Use of validated schemas, typed contracts, modular boundaries, documented responsibilities and controlled change surfaces to support maintainability and reduce regression risk.
Modular Code & Documentation
Codebase structured into functional Blocks documenting Responsibilities, Invariants and Connections. Produced and maintained 45,286 lines of engineering documentation aligned with the repository, migrations, architecture decisions and production behaviour.
GitHub, CI/CD & Deployment
Analysis and implementation of technical scopes, review of code changes and preparation of structured GitHub Pull Requests. Use of source-controlled workflows, automated validation, health checks, controlled deployments and rollback procedures instead of direct production hotfixes.
Resilience, Security & Compliance
Implementation of rate limits, timeouts, bounded retries, circuit-breaker controls, safe defaults, graceful degradation, expiring leases, stale-worker recovery and typed terminal states. WordPress hardening includes custom login protection, Fail2ban policies, automated ban expiry and log rotation.
Requirements & Delivery
Translation of business needs into implementation stages, dependencies, risks, measurable acceptance criteria and production safeguards. Combines hands-on software delivery with 18 years of experience in regulated multinational environments, including process governance, compliance, documentation and stakeholder communication.
Experience
Professional experience0 - 5 years
Freelancer since2026
Languages
EnglishFluentPortugueseNative speakerSpanishGood
Project history
Independently conceived, architected and built TrustSender.io, a B2B email-validation SaaS, from the initial business concept and system sketches to an operational production SaaS. Owns the complete SaaS production lifecycle including product discovery, business model, requirements, UX, architecture, data, APIs, authentication, billing, security, infrastructure, CI/CD, observability, deployment, operations, support and scalability. Applies AI to accelerate software delivery within governed engineering workflows.
Held leadership responsibilities across sales to pharmacy chains, trade marketing and product ownership within marketing functions. Managed complex commercial processes, stakeholder alignment, priorities and execution in regulated multinational environments.
Held leadership responsibilities across sales to pharmacy chains, trade marketing and product ownership within marketing functions. Managed complex commercial processes, stakeholder alignment, priorities and execution in regulated multinational environments.