Helder Esteves

Helder Esteves

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Full Stack Engineer
Lisbon, Portugal
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Résumé

Jobs verified_user 0% verified
  • A Labs
    Senior Full Stack Engineer
    A Labs
    May 2023 - Jun 2025 (2 years 2 months)
    - Enhanced server-side rendering and caching, improving performance by up to 90% (Next).
    - Collaborated closely with product managers and designers to iterate rapidly on user-facing features.
    - Developed robust analytics tools for the World Poker Tour, delivering critical insights (Vue, Nuxt).
    - Designed reusable UI components and internal design system aligned with accessibility (WCAG) standards.
    - Regularly mentored junior developers and led code review processes to ensure high engineering standards across the team.
    - Piloted feature flag system for safer rollouts and faster A/B testing, improving feature validation.
  • L
    Senior Frontend / Full Stack Engineer
    Lexis Create formerly Henchman
    Sep 2021 - Apr 2023 (1 year 8 months)
    - Collaborated directly with product and legal teams to define frontend workflows in Figma.
    - Led frontend architecture for core applications, including an operations dashboard and Microsoft Word add-in (React, Next).
    - Drove UX enhancements that improved customer adoption by 40%; contributed to the platform winning Best UX/UI SaaS Award in 2022.
  • Uncapped
    Frontend Engineer
    Uncapped
    Mar 2020 - Sep 2021 (1 year 7 months)
    - Delivered a real-time operations dashboard used in strategic business decisions (React, Node).
    - Built and maintained data visualizations to surface lending KPIs and customer insights (Chart.js).
    - Boosted customer engagement by 30% through interactive UI improvements and A/B testing.
  • T
    Full Stack Engineer
    Twistag
    Jul 2019 - Feb 2020 (8 months)
    - Developed a referral system for an e-commerce platform, increasing sales by 10% (React, GraphQL).
    - Optimized backend logic and queries for enterprise clients, reducing system load by ~30% (Node).
  • Uniguest
    Software Engineer
    Uniguest
    Feb 2018 - Jun 2019 (1 year 5 months)
    - Built interactive digital signage for Tottenham Stadium and Miami Marlins (JavaScript, Node).
    - Implemented failover logic and logging for content delivery across 100+ devices.
Education verified_user 0% verified
  • Universidade do Porto
    Universidade do Porto
    Universidade do Porto
    Jan 2018 - Current (8 years 10 months)
  • Wrocław University of Science and Technology
    International Exchange Program, Electrical and Computer Engineering
    Wrocław University of Science and Technology
    Jan 2016 - Jan 2017 (1 year 1 month)
  • Universidade do Porto
    Master's degree, Electrical and Computer Engineering
    Universidade do Porto
Projects (professional or personal) verified_user 0% verified
  • S
    Salsify
    Sep 2025 - Current (1 year 2 months)
    - Took ownership of critical UI architecture to drive the on-time delivery of the "Tenders" contract negotiation feature, facilitating pricing and item proposals between retailers and suppliers. - Delivered the groundwork for dynamic logistical hierarchies, called "Textiles", and actively shaped the company’s internal library by designing reusable components for future developers.
  • M
    MetaWin
    Aug 2024 - Nov 2024 (4 months)
    - Built secure transaction and user management systems across the frontend and backend layers. - Developed backend logic for token-based rewards, ensuring the integrity of user transactions.
  • S
    Speakrandom
    Oct 2020 - Apr 2023 (2 years 7 months)
    - Built and scaled a social media platform from 0 to 15K MAU with real-time features (Next, PostgreSQL, WebRTC, WebSockets, Redis). - Designed a modular backend supporting rapid development and release cycles. - Supported both frontend and backend tasks within a small agile team.