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Abel Lavieri

@abellavieri

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Backend Engineer | PostgreSQL | API Architecture | Performance Optimization | Ruby, Python & TypeScript

Venezuela

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What I'm looking for

Looking for a long term professional relationship with companies that develop challenging solutions

Backend Engineer with 4+ years of experience building and optimizing production systems across Ruby on Rails, FastAPI, and NestJS environments.

I specialize in API development, PostgreSQL optimization, database design, and application performance. Throughout my career, I've improved response times by up to 80%, optimized complex queries, redesigned databases to improve maintainability, and increased reliability through testing and engineering best practices.

My experience spans Ruby, Python, and TypeScript ecosystems, with a strong focus on backend architecture, scalability, and problem-solving. I'm also expanding my expertise in cloud infrastructure, CI/CD, containerization, and platform engineering.

Currently interested in Backend Engineer, Platform Engineer, and backend-focused Full Stack opportunities where I can help build reliable, scalable, and high-performing systems.

Experience

Work history, roles, and key accomplishments

Full-stack Developer

Cleteci

May 2025 - Nov 2025 (6 months)

Improved invoicing performance by 15% through query optimization and service-object architecture, while enhancing UX with custom PDF invoice generation tied to client transaction history. Accelerated new project setup by 35% with FastAPI, NestJS, and Angular templates, and led adoption of secret vaults to strengthen credential security.

Ruby on Rails PostgreSQL ActiveRecord Service Objects Query Optimization Angular Secret Management Security fastAPI NestJS

Full-stack Developer

Outlier

Aug 2024 - Jun 2025 (10 months)

Reviewed LLM-generated code quality, correcting critical errors and improving the reliability of the produced output. Restructured LLM SQL queries to reduce unnecessary joins and intermediate tables, and assessed prompt adherence by evaluating how closely responses matched prompt parameters.

SQL Query Optimization Prompt Evaluation PostgreSQL Code Quality Assurance Intermediate Table Reduction Ruby on Rails

Full-stack Developer

Dacosi

Feb 2025 - May 2025 (3 months)

Reduced the Dacomed application response time by 80% by optimizing backend request volume and implementing custom client state management. Restructured the web app database to reduce data redundancy by 40% by eliminating repeated tables.

State Management Database Restructuring SQL Performance Optimization Data Normalization Django Django REST Framework Next.js

Full-stack Developer

Cleteci

Mar 2022 - Nov 2023 (1 year 8 months)

Built and maintained Ruby on Rails backend features for TravelContact, revamping key modules and contributing to a 15% rise in customer satisfaction. Improved trips module response time by 30%, launched the first agent reconciliation module to standardize commissions, streamlined trip creation with flight autocomplete and tracking API integration, and raised test coverage to 80%.

Ruby on Rails ActiveRecord Serialization API Integration Third Party Flight Tracking API Performance Optimization NestJS fastAPI Angular

Web Development Mentor

Microverse

Mar 2021 - Mar 2022 (1 year)

Mentored integration of authentication solutions across the React frontend and Ruby on Rails backend, reducing development time by 20%. Guided adoption of a headless architecture to reduce integration conflicts and enable a 20% faster development process and on-time MVP delivery.

React Ruby on Rails Authentication Git Github Mentorship

Education

Degrees, certifications, and relevant coursework

Microverse

Full Stack Web Development Program, Full Stack Web Development

2019 - 2023

Activities and societies: 1300+ hours; remote pair programming; Git/GitHub; Gitflow; daily standups; projects with Ruby/Rails/JS/React/Redux.

Completed a Remote Full Stack Web Development Program (full-time), building projects with Ruby on Rails, JavaScript, React, and Redux while mastering algorithms and data structures. Developed skills in remote pair programming and collaboration using Git/GitHub and Gitflow.

Universidad Central de Venezuela

Bachelor of Science, Computer Science

2010 - 2016

Pursued a Bachelor’s degree in Computer Science, with studies currently on hold. Covered foundational computer science coursework over the 2010–2016 period.