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PTEN

Leonardo Veras

Software Developer · Serra Talhada, Brazil

GitHubLinkedIn[email protected](87) 99956-9551

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Professional summary

Backend developer with 6 years of experience in Python and Django, building REST APIs, designing databases and running asynchronous processing with Celery and RabbitMQ. Experienced in bringing AI solutions (RAG, LLMs) into production systems, optimizing the ORM and integrating with external services.

Work experience

Backend Developer — DTI-2 Research Fellow, AvançaMEI (FAPESQ/PB)

Sep 2025 – present

  • Senior developer on the team, responsible for the most technically complex tasks and for planning the work of the junior developers.
  • Implemented the Keycloak (GOV.BR) integration for authentication and login on the platform, including creating and managing user roles.
  • Mentor junior developers and interns through code review and technical guidance.
  • Work with a multidisciplinary team on requirements validation, auditing and data visualization features.

Full Stack Developer — TESTEME

Aug 2025 – Dec 2025

  • Built a pipeline that extracts SAEPE exam questions using AI models.
  • Implemented a multi-tenant architecture for 3 registered municipalities (5 schools, over 1,000 students), with DNS and a custom site per tenant configured through Cloudflare.
  • Built a system for taking SAEPE practice tests, with gamified interaction inspired by Duolingo.
  • Implemented caching with invalidation for the platform’s practice tests and queries, cutting response time from 2s to as little as 100ms.
  • Implemented answer metrics dashboards (by municipality, school, grade and class) with Metabase.
  • Built asynchronous tasks with Celery and Redis for background processing.
  • Set up Cloudflare R2 storage for the platform’s files.
  • Deployed the system to a VPS with Docker, Supervisord and a CI/CD pipeline.

Full Stack Developer — Montseguro Corretora

Sep 2024 – Sep 2026

  • Optimized the health insurance quoting process, cutting response time from 10s to as little as 200ms.
  • Built RPAs to automate data updates, cutting the process from 3 days to a few minutes.
  • Implemented WhatsApp message tracking for over 20 salespeople through the Evolution API, handling a flow of about 100,000 messages, with conversation analysis based on sales playbooks and methodologies.
  • Built a real-time notification system over WebSocket, delivering instant updates to every user logged in to the platform.
  • Built an AI transcription pipeline for audio, video and images to enrich the context of the WhatsApp conversation analysis.
  • Implemented a payment gateway with Asaas, including subscription management and recurring billing.
  • Implemented asynchronous queues with Celery for background processing.
  • Built an internationalization (i18n) system and custom per-module permissions.
  • Integrated third-party platforms (life insurance carriers) such as Tokio Marine and Porto Seguro.

Backend Developer — WOLOLO/USEFLOW

Apr 2022 – Aug 2025

  • Refactored the query architecture to run on asynchronous queues, cutting response time from 5s to as little as 300ms.
  • Built an integration with the Meta API to pull Instagram posts: a full initial load of the history and hourly polling for new posts since the last synced date.
  • Built a survey module supporting multiple question types (NPS, multiple choice, single choice, free text and more), used by over 1,000 users, with local persistence in IndexedDB on the front end so answers are not lost when the connection drops.
  • Implemented automatic publishing of articles to multiple networks (Instagram, LinkedIn, WhatsApp and others).
  • Built metrics dashboards with Metabase and with Django Templates/Bootstrap.
  • Owned the deploy pipeline (Fabric) and the branch versioning workflow.
  • Took part in requirements gathering, turning business pain points into technical specifications.

Full Stack Developer — Layout Sistemas

Jun 2021 – Apr 2022

  • Fixed critical bugs in payroll calculations processed in asynchronous Celery tasks.
  • Migrated the user import module from the legacy Delphi system to Django/React.
  • Built payroll integration templates following the Central Bank of Brazil (BACEN) standards.
  • Built queries to export data from the platform.

Extension Fellow and Junior Full Stack Developer — Sertão Mais Saúde

Jun 2020 – Dec 2020

  • Built COVID-19 data dashboards for Serra Talhada, including the data updates and lookups behind them.
  • Integrated the Jitsi video call system for remote care, creating a new meeting room for each appointment.
  • Built and optimized the queries behind the platform’s interactive dashboards.
  • Took part in defining the platform’s architecture and data model.
  • Maintained the endpoints and gave technical support to the user support team.

Education

Bachelor’s degree in Information Systems

Federal Rural University of Pernambuco (UFRPE) — Serra Talhada Academic Unit (UAST)

Apr 2024

Technical skills

  • Backend: Python, Django, Django REST Framework (DRF), Celery, Celery Beat, RabbitMQ, Redis, SQL
  • Frontend: JavaScript, React, Tailwind CSS, DaisyUI, Astro, HTML, CSS, Django Templates, HTMX
  • Data: PostgreSQL, MySQL, pgvector, Polars, Pandas
  • AI / LLM: LangChain, LLM integration (RAG), Claude Code
  • Infrastructure / DevOps: Docker, CI/CD, Linux, VPS (Hostinger), Easypanel, Supervisord, Cloudflare (DNS, R2), MinIO (S3-compatible), Git
  • Integrations and concepts: Payment gateways, REST APIs, data modeling, asynchronous processing, multi-tenant architecture, Git Flow, PRD (Product Requirements Document), Scrum, Kanban, distributed architecture

Languages

  • Portuguese — Native
  • English — Basic/Intermediate (technical reading level)