Available for product, frontend and AI evaluation work

Jake Zeledon

Fullstack Engineer / Frontend Specialist / AI Evaluation

I specialize in crafting pixel-perfect, engaging and accessible digital experiences, leveraging my wealth of experience and expertise. With a focus on innovation and quality, I thrive on tackling challenges and delivering outstanding results.

LinkedIn GitHub Email

Since 2017 Building software

AI Quality review workflows

UI Accessible interfaces

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Current Mission

Reviewing AI evaluation quality at scale

Scale AI Mar 2026 — Present

AI Evaluation Reviewer (Quality Control & Model Assessment)

I review complex AI evaluation workflows to ensure quality, consistency, and alignment with internal standards. My work focuses on assessing model behavior, identifying evaluation issues, improving feedback quality, and helping strengthen the reliability of AI systems across multi-step tasks.

AI Evaluation Quality Review Model Assessment Failure Analysis Evaluation Standards


role.current = {
  company: "Scale AI",
  role: "AI Evaluation Reviewer",

  focus: [
    "quality review",
    "model assessment",
    "evaluation consistency"
  ],

  work: {
    analyze: "complex AI behavior",
    review: "evaluation workflows",
    improve: "feedback quality and reliability"
  },

  impact: {
    reduce: ["ambiguity", "inconsistency"],
    strengthen: "AI evaluation quality at scale"
  }
}

Data in use

Turning AI signals into stronger systems

A visual reference for the kind of evaluation work I support: reviewing complex model behavior, identifying patterns, reducing ambiguity, and turning feedback into clearer, more reliable AI systems.

Career Timeline

Experiences

Scale AI

Full-time

Mar 2026 — Present

AI Evaluation Reviewer @ Scale AI

Review AI evaluation workflows for quality, consistency, and alignment with internal standards. I assess model behavior across complex tasks, identify evaluation issues, and provide feedback that helps improve reliability, clarity, and reviewer alignment at scale.

AI Evaluation Quality Review Model Assessment

AG Software

Full-time

May 2025 — Mar 2026

Fullstack Developer @ AG Software

Contracted by AG Software to contribute to internal platforms for Classical Conversations, a global organization that supports homeschooling communities. I develop and maintain scalable web applications and APIs.

React TypeScript Node.js Fastify Knex Jest

Sicsa

Full-time

Aug 2024 — Nov 2024

Lead Frontend Developer @ Sicsa

Led a team in transforming an online ordering platform that facilitates the dropshipping business model for clients, enabling the management of supplier data and the generation of sales orders.

Laravel PHP Tailwind UI UX

Logacode

Freelance

Jul 2024 — Oct 2024

Frontend Developer @ Logacode

Contributed to building new, visually appealing and user-friendly components for the project. Focused on improving the user interface and ensuring seamless interaction.

Next.js React Redux Tailwind TypeScript

Nicasource

Full-time

Jul 2021 — Sep 2023

Engineering Team Lead @ Nicasource

Engineering Team Lead · Apr 2022 — Sep 2023 Software Developer · Jul 2021 — Mar 2022

Contributed to the development and evolution of voice-driven products across multiple platforms, working on both user-facing experiences and supporting systems. Improved reliability and scalability by modernizing legacy components, introducing frontend solutions, and supporting deployment workflows in cloud and serverless environments. Collaborated on high-traffic integrations, optimizing data handling and request flows. As Team Lead, guided a voice-focused team, ensuring consistent delivery, technical quality, and collaboration across projects.

Angular AWS Docker Node.js JavaScript TypeScript Voice Apps Serverless

Atlas Primer

Freelance

Oct 2021 — May 2022

Voice Developer @ Atlas Primer

Contributed to Atlas Primer, a voice-enabled learning experience available through Alexa and Google Assistant. Implemented fixes and new features for the product, helping improve stability, functionality, and the overall experience of interacting with learning content through voice.

Alexa AWS Google Assistant Node.js JavaScript Voice Experience

Nicaraguan Social Security Institute

Full-time

Apr 2017 — Jun 2021

Programmer @ INSS

Programmer · Feb 2021 — Jun 2021 System Integrator · Apr 2018 — Jan 2021 Digitalization Operator · Apr 2017 — Mar 2018

Owned quality assurance for the pensions module, validating both business rules and system behavior through unit and integration testing. Built automated testing workflows by integrating Selenium with Java-based test suites, improving reliability and coverage. Led a QA team to ensure full validation of the module, including complex financial calculations. Leveraged SQL to extract and prepare test data, transforming it into structured inputs for automated tests. Increased test coverage to over 85%, significantly improving system stability.

Java SQL Selenium JUnit Test Automation Integration Testing

Atomic Developers

Freelance

2017 — 2024

Frontend Developer @ Atomic Developers

Led frontend development as a freelancer, defining the visual architecture of applications and ensuring consistency across the entire interface. Implemented reusable component systems based on Atomic Design, maintaining coherence between layouts, styles, and UI behavior. Focused on building clean, aligned, and scalable user experiences, using tools like Adobe XD to design and validate interfaces before implementation.

Angular JavaScript TypeScript HTML & CSS Component Architecture Design Systems Atomic Design Adobe XD

Community

Teaching

Teaching
is part of
building.

CS50 Certificate

A foundation built through teaching.

This recognition represents more than a certificate. It reflects my experience helping learners understand programming fundamentals, supporting a rigorous computer science learning environment, and turning technical concepts into clear, approachable lessons.

01 Teaching support

Guided students through programming fundamentals and problem-solving.

02 Clear communication

Translated complex concepts into practical and accessible explanations.

03 Community learning

Contributed to a local learning experience connected to a global program.

CS50 Certificate from Harvard University awarded to Jake Antonio Ruiz Zeledón

Tech

Stack

JavaScript

TypeScript

React

Next.js

Tailwind

Figma

Node.js

NestJS

SQL

MongoDB

Docker

AWS

HTML

CSS

Angular

Java

Git

Let’s build

Reliable systems. Beautiful interfaces. Useful AI.

I enjoy building products that feel good, work reliably, and solve real problems.

Email me

Jake Zeledon

Reviewing AI evaluation quality at scale

AI Evaluation Reviewer (Quality Control & Model Assessment)

Turning AI signals into stronger systems

Experiences

AI Evaluation Reviewer @ Scale AI

Fullstack Developer @ AG Software

Lead Frontend Developer @ Sicsa

Frontend Developer @ Logacode

Engineering Team Lead @ Nicasource

Voice Developer @ Atlas Primer

Programmer @ INSS

Frontend Developer @ Atomic Developers

Teaching

Teaching is part of building.

A foundation built through teaching.

Stack

Reliable systems. Beautiful interfaces. Useful AI.

Teaching
is part of
building.