Zozo / Junior Frontend Engineer

Zozo.FrontendEngineer.

I'm Zolbayar Byambajav (Zozo), a junior frontend engineer at erxes Inc. in Ulaanbaatar. I build production interfaces with React and TypeScript, with experience across full-stack web and mobile projects.

View ProjectsDownload Resume
Ulaanbaatar, MongoliaView GitHub
Zozo portrait

Zozo.

Junior Frontend Engineer

Open for freelance projects

Selected work

A few things I've built.

Selected work across interactive web experiences, collaborative full-stack development, and mobile learning.

Galexora
Frontend Developer2026

Galexora

A cinematic space exploration site designed to prove strong frontend storytelling, section architecture, and polished interaction work.

Next.jsTypeScriptFramer Motion
View case study
Sign Language Web
Full-stack Developer2026

Sign Language Web

A team-built sign language platform in a shared monorepo with live ASL and MNSL detection, practice flows, and admin-managed vocabulary.

Next.jsGraphQLPrisma
View case study
WordGym Mobile App
Mobile App Developer2026

WordGym Mobile App

A team-built mobile vocabulary app with deck creation, AI-assisted card generation, offline-first study flows, and practice mini-games.

ExpoReact NativeTypeScript
View case study

Full-stack Developer

Quiz App

A quiz platform with authentication, guided quiz flow, and database-backed content management.

View case study

Open a case study to see the decisions, contribution, and result behind each project.

Profile

The person behind the pixels.

Junior Frontend Engineer at erxes Inc., with experience across production interfaces, full-stack development, and mobile projects.

I am a Junior Frontend Engineer at erxes Inc. in Ulaanbaatar. I build and maintain production interfaces with React and TypeScript, integrate GraphQL APIs, and work with the team through code reviews and iterative development. Before joining erxes, I completed software engineering training and a full-stack internship at Pinecone Academy. My projects also include web and mobile applications built with Next.js, React Native, and PostgreSQL.

Based in
Ulaanbaatar, Mongolia
Currently at
erxes Inc.
Best fit
Product-focused frontend and full-stack development

What I bring

  • Build responsive frontend experiences with React, Next.js, TypeScript, and a strong eye for layout, motion, and hierarchy.
  • Handle backend features with Node.js, GraphQL, Prisma, PostgreSQL, and API-driven product workflows.
  • Work comfortably across solo builds and team projects, with a focus on shipping clear, maintainable product work.

Recent path

Learning. Building. Shipping.

Currently a Junior Frontend Engineer at erxes Inc., following software engineering training and a full-stack internship at Pinecone Academy.

2026 - Present

erxes Inc.

Junior Frontend EngineerCurrent

Building and maintaining production frontend features as part of the engineering team at erxes Inc.

  • Build reusable components and responsive interfaces for business workflows in a TypeScript and React monorepo.
  • Integrate GraphQL APIs and shared services, handling permissions, loading states, errors, and asynchronous updates.
  • Collaborate through code reviews, debugging, and refactoring to improve maintainability and application quality.

June - August 2026

erxes Inc.

Frontend Intern

Completed a frontend internship at erxes Inc. before moving into my current Junior Frontend Engineer role.

    July 2025 - April 2026

    Pinecone Academy

    Software Engineering Trainee & Full Stack Intern

    Completed project-based software engineering training and contributed to a team-built sign-language learning platform during a full-stack internship.

    • Built sign-language learning features with Next.js, GraphQL, Prisma, PostgreSQL, and MediaPipe in a shared monorepo.
    • Developed web and mobile projects involving authentication, APIs, local storage, and offline-first learning flows.
    • Worked on WordGym with Expo and React Native, including vocabulary decks, practice, and games.

    2025

    High School

    High School Graduate

    Graduated high school in 2025 and committed early to software engineering as the path I wanted to build in.

    • Finished high school in 2025.
    • Started focusing seriously on software engineering after graduation.

    Core stack

    Tools I build with.

    The stack behind the projects on this site, from polished interfaces and mobile flows to backend logic, data, and detection work.

    8 skills

    Frontend & Mobile

    My strongest build surface for shipping responsive interfaces, interaction flows, and mobile-friendly product experiences.

    ReactReact NativeNext.jsTypeScriptJavaScriptHTMLCSSExpo
    6 skills

    Backend & APIs

    The tools I use for application logic, authentication, API integration, and the parts of a product that need real structure behind the UI.

    Node.jsREST APIsGraphQLApollo ClientApollo ServerPrisma
    8 skills

    Data & Cloud

    The storage and deployment layer behind the full-stack work I have been building and shipping.

    PostgreSQLMySQLMongoDBSupabaseFirebaseCloudflareDockerGit
    5 skills

    Testing & Detection

    Experience with verification, detection workflows, and data-backed features that need more than static UI work.

    JestUnit TestingIntegration TestingE2E TestingMediaPipe

    Contact

    Let's build something.

    Need a website, a frontend feature, or improvements to an existing product? I am open to freelance projects alongside my role at erxes Inc.

    Junior Frontend Engineer at erxes Inc.

    Tell me what you want to build.

    Share your goals, scope, and timeline. We can discuss how I can help with responsive interfaces, React and Next.js development, or API integration, and agree on availability before starting.

    [email protected]
    GitHubLinkedIn
    Based in Mongolia
    Junior Frontend Engineer at erxes Inc.
    Open to freelance client projects