Altamar Labs

Experience

6+ years building systems that can't fail

Alfonso Altamar's background, the engineer behind Altamar Labs, combines roles as a backend engineer on high-stakes fintech products and as the technical lead on his own products.

  1. 2025 to present

    Backend Engineer

    Fintech, bank integrations

    Part of a team specialized in integrations with financial institutions and payment providers. The work focuses on transactional consistency, idempotency, fault tolerance, and measurable reliability improvements across ingestion, validation, and synchronization pipelines.

    • Redesigned sync job orchestration with idempotency handling and more robust retry strategies, cutting down intermittent production errors.
    • Optimized connector response parsing and connection pooling to speed up transaction retrieval.
    • Designed a cross-platform OTP pipeline for unattended banking workflows, combining an Android app (Kotlin + Jetpack Compose) and a Chrome extension coordinated in real time.

  2. 2026 to present

    Full-Stack Developer

    Art e-commerce, real-time auctions

    Built an e-commerce platform for a contemporary art gallery, covering the full stack from the Rails backend to the Next.js frontend.

    • Real-time auction module on ActionCable, including bidding time auto-extension and concurrent bid handling with Sidekiq.
    • Integrated Stripe and cryptocurrency payments as alternative methods for international buyers.
    • Search engine on Meilisearch with a PostgreSQL fallback, plus an artist commission settlement system with tax calculation and PDF report generation.

  3. 2024 to 2025

    Full-Stack Developer

    AI-powered recruiting

    Developed the core of an AI-powered conversational recruiting platform, including serverless microservices on AWS Lambda, real-time data streaming, and REST/WebSocket APIs for candidate matching.

  4. 2024 to 2025

    Full-Stack Developer

    Logistics and e-commerce

    Maintenance and evolution of a logistics and e-commerce platform in Ruby on Rails and Next.js, including an integration with a third-party last-mile delivery provider for service synchronization.

  5. 2022 to 2024

    Backend Developer

    Accenture Colombia

    Backend support for a payment gateway (transaction orchestration, refunds, and reconciliation) within a large-scale Ruby monolith, backend support for a major bank in Java/Spring Boot, and high-traffic landing page development for a telecom operator.

    • Improved overall performance through Redis caching, background jobs, and more robust API error handling.

  6. 2021 to 2022

    Full-Stack Developer

    Logistics, routing and fleets

    Designed a Dijkstra shortest-path routing algorithm for a delivery app, improving delivery route efficiency, plus real-time GPS tracking dashboards for fleet monitoring and API and legacy frontend refactoring for an e-commerce client.

  7. 2020 to 2021

    Web Developer

    Web development

    Developed and maintained internal dashboards and client management systems in PHP and JavaScript, the entry point into software engineering.