Levi Eber

Full Stack Developer

contact@levieber.com+351 938 360 596linkedin.com/in/levi-ebergithub.com/Levieber

Professional Summary

Full Stack Developer (TypeScript/JavaScript, React, Next.js, NestJS) focused on tracing systems back to root cause, not just patching symptoms. Favors pragmatic architecture over ceremony, choosing frameworks, DI approaches, and tooling based on measurable impact on velocity and maintainability rather than novelty. Comfortable across unfamiliar codebases and stacks, including open source contributions outside primary tooling. Ships improvements to both user and developer experience, keeping solutions simple while delivering systems that are faster for users, cheaper to run, and easier for the next person to extend.

Education

Full Stack JavaScript Development Certification — Onebitcode

Courses in React, Node.js, Testing, Docker, Java, and AWS. Recognized as one of the most active community members, helping students across multiple cohorts — this engagement led directly to being hired as Technical Support.

Web Development Certification Courses — Alura

Completed multiple courses; recognized as one of the most active learners, regularly helping other students in course community.

Professional Experience

Mid-level Full Stack Developer

Feb 2025 – Present

Upbet

  • Rebuilt the frontend and contributed across the stack for a full platform migration serving 150k+ users, improving performance throughout.
  • Cut permission-related bugs and incidents by refactoring the dashboard's permission system with granular, action-level permissions.
  • Instrumented OpenTelemetry tracing and Pino structured logging (Grafana Loki/Tempo/Alloy) plus frontend tracing with Grafana Faro, cutting time to diagnose and fix incidents.
  • Cut home page transfer size by 70% (500KB to 150KB) by optimizing images with the Next.js Image component, adding lazy loading, and trimming the JS bundle by replacing dependencies with native solutions.

Full Stack Developer

Aug 2024 – Mar 2025

Infinity Tec

  • Cut image delivery costs by 99% by diagnosing recurring failures from expired S3 signed URLs and redesigning delivery behind a private CloudFront distribution, eliminating manual interventions.
  • Cut memory usage of two Next.js frontend services by 75% (400MB to 100MB) by rebuilding their Dockerfiles with multi-stage build practices.
  • Cut backend response time by up to 90%, from about 1 second to 80-180ms, by refining database queries and removing over-applied caching from fast, low-frequency endpoints.

Technical Support

Apr 2024 – Oct 2024

Onebitcode

  • Resolved 90%+ of student technical questions in Python and JavaScript.
  • Provided mentoring and support via voice and text, improving student understanding and satisfaction.
  • Conducted code reviews and pair programming sessions to reinforce learning outcomes.

Skills

Technologies

React.js, Next.js, Nuxt.js, Node.js, Nest.js, FastAPI, HTML5, CSS, Tailwind CSS

Languages

JavaScript, TypeScript, Python

DevOps / Tools

Docker, Kubernetes, AWS (CloudFront, S3), Railway, GitHub Actions, Trello, Git, OpenTelemetry, Pino, Grafana Faro

Testing

Jest, Vitest, Cypress, Playwright, Testing Library

Performance & SEO

Core Web Vitals, SEO

Practices

CI/CD, Pair Programming, Code Review, TDD

Soft Skills

Communication, Teamwork, Problem-Solving, Critical Thinking, Adaptability, Proactivity, Attention to Detail

Open Source

Contributed to Biome (open source JS/CSS toolchain): documentation translation and bug-fix PRs in CSS and Rust.

Languages

Portuguese

Native

English

B2 Reading / C1 Listening (EF SET Certified)