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Yoan Cespedes WilliamsYC

Yoan Cespedes Williams

Tech Lead | AI Product Engineer | MVP Builder

€380/day
Leiria, PT
8-15 years

Average response time: 1 hour

About Yoan

I help founders and enterprise teams ship product end-to-end — from system architecture to production. As Co-Founder & Lead Product Engineer at Bitfera (see: bitfera.dev) a Lisbon-based product squad, I lead engagements where someone needs to scope, build, and ship — not just code.


12+ years across public safety SaaS (First Due, USA — supporting 16+ live US emergency response agencies), retail e-commerce (Cencosud Jumbo + Santa Isabel, LATAM — multi-million USD revenue platforms), energy (EDP Group, Portugal — core operations platform), and telecom (Telefónica — €120K multi-phase delivery).

What I deliver: tech leadership of squads, system architecture for new platforms and modernization, full-stack development (TypeScript, React, Next.js, Node.js, AWS), and AI-powered product integration (Anthropic Claude certified — API, MCP, Agents — with LLMs in daily engineering workflow).

Strong fit for fast-moving teams who need a senior who can architect, code, ship, and measure. Open to long-term Tech Lead / Lead Product Engineer engagements, focused MVPs with founders, or migration and modernization missions for established products.

Working in English, Spanish, or Portuguese. Remote worldwide, with occasional travel in Europe (Lisbon, Madrid, Paris).
  • Spanish

    Native or bilingual

  • English

    Fluent

  • Portuguese

    Conversational

Remote only
Primarily works remotely

Experience

  • Bitfera LDA
    Co-Founder & Lead Product Engineer
    TECH
    January 2025 - Today (1 year and 5 months)
    Leiria, Portugal
    Custom product squad (engineering, design, QA) helping founders and enterprise clients build and evolve product end-to-end without standing up their own team.
    Lead technical and product direction across all engagements: system architecture, AI integration strategy, squad coordination, delivery quality, and client communication.
    Active client engagements: First Due (public safety SaaS, USA), Cencosud (retail e-commerce, LATAM, via Witi), and Witi (AI-powered recruitment platform, Chile).
    Set engineering standards across the squad: Next.js / Node / TypeORM / AWS conventions, CI/CD baselines, and code-review practices applied uniformly across client work.
    Operate as the technical face of the company: scope negotiation, proposal writing, hiring, and quarterly client reviews.

    Key deliverables: Squad operations playbook
    · client engagement framework
    · engineering standards documentation
    · AI integration paterns library.
    AI Engineering Product Development CI/CD Management SEO Fullstack
  • First Due (Locality Media Inc.)
    Senior Frontend Engineer → Lead Product Engineer
    DIGITAL AND IT
    November 2022 - Today (3 years and 7 months)
    New York, United States
    Production-grade SaaS used by US emergency response agencies (fire departments, EMS) for incident response, scheduling, deployment, and personnel time tracking.
    Owned end-to-end delivery of three core modules — Scheduling, Time & Atendance, Deployment — from architecture to production rollout.
    Built Time & Atendance from scratch (Time Cards + Time Clock), digitally tracking check-in/out and incident related hours for first-responder personnel across 16+ live agencies.
    Built and maintained CI/CD pipelines improving release consistency and reducing deployment time — supporting platform rollout from 16+ to a continuously growing customer base.
    Designed real-time notification architecture across the mobile platform, enabling dynamic UI updates and improving responsiveness for dispatchers and field personnel.
    Standardized state management with a store-based patern across Vue components, removing duplicated logic and accelerating feature delivery.

    Key deliverables: Scheduling module (production)
    · Time & Attendance suite (Time Cards + Time Clock, production)
    · Deployment module (production)
    · CI/CD pipelines
    · real-time notification architecture.

    Stack: Vue.js, PHP (Yii Framework), Node.js, PostgreSQL, AWS, CI/CD, Jira.
    Fullstack VueJS PHP Docker PostgreSQL
  • Witi (Chile)
    Tech Lead
    DIGITAL AND IT
    January 2026 - April 2026 (4 months)
    Santiago, Chile
    Modern recruitment product. Providing to the platform's technical direction as Tech Lead: architecture, stack decisions, AI integration design, and delivery quality across the team.
    Built on Next.js (full-stack) with AI integration powering [matching / candidate evaluation / search] workflows in production.
    Set up CI/CD on Azure for reliable deployments, environment promotion, and release consistency.

    Key deliverables: Platform architecture
    · AI workflow design

    · CI/CD on Azure
    · technical roadmap and team coordination.

    Stack: Next.js, TypeScript, Azure CI/CD.
    Product Development Fullstack Next.js Microsoft Azure AI Agent

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Education

  • Bachelor in Informatics Sciences
    University of Informatics Sciences (UCI)
    2014
    Bachelor in Informatics Sciences

Certifications

Skill set

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