Full Stack Developer Java, Python, React

KELSON BRITO

Full Stack Developer Java · Spring Boot · Python · Django · React · Next.js · AWS · Kubernetes João Pessoa, Paraíba, Brazil +55-83-987*-**** *************@*****.*** linkedin.com/in/kelson-brito-ba922b363 github.com/kelsonbrito50

PROFESSIONAL SUMMARY

Full stack developer building production systems end to end: Python and Django on the backend, React and Next.js on the front, deployed on AWS. Production e-commerce handling live card payments, and a public Spring Boot service backed by PostgreSQL with Flyway migrations and integration tests against a real database. 550 automated tests across my public repositories, with Docker, Kubernetes and CI/CD on every build. UC San Diego certified in Java Programming (I–IV) and Front-End Development. Trilingual, focused on secure, testable, maintainable software. TECHNICAL SKILLS

Languages Java, Python, TypeScript, JavaScript, SQL, Bash Backend Spring Boot, Spring MVC, Spring Security, Django, Django REST Framework, REST APIs, JWT, OAuth, Celery Frontend React, Next.js, Angular, TypeScript, RxJS, Tailwind CSS, HTML5, CSS3 Databases PostgreSQL, Spring Data JPA, Hibernate, Flyway, JDBC, Redis, DynamoDB Testing pytest, JUnit 5, Mockito, Testcontainers, JaCoCo, TDD, unit & integration testing (550 automated tests across public repositories)

Cloud & DevOps AWS (EC2, S3, RDS, Lambda, API Gateway, DynamoDB, SQS, SNS), Terraform, Docker, Kubernetes, GitHub Actions, CI/CD, Linux, Nginx, Gunicorn, Cloudflare Build & Tools Maven, Gradle, Git, IntelliJ, Eclipse, VS Code, Postman Practices Clean Code, SOLID, Design Patterns, Agile, Scrum, Kanban PROFESSIONAL EXPERIENCE

BabyHappy — João Pessoa, Brazil (Remote) Apr 2025 – Present Full Stack Developer (Back End Developer, Apr–Oct 2025) Developer on babyhappyjp.com.br, a production Django + React e-commerce platform for a Brazilian baby products brand. Built and shipped the storefront across 13 Django apps; product pages score 95/100 on Lighthouse performance. Integrated the Cielo payment gateway for live card transactions with error handling and retry logic on failed authorizations. Designed the REST API in Django REST Framework with JWT auth, pagination, filtering, and role-based access control. Wrote 179 unit and integration tests at 90%+ coverage; no production regressions reported since launch. Offloaded email, order workflows, and inventory updates to Celery + Redis. Automated testing and deployment with GitHub Actions CI/CD, including Bandit and pip-audit security scanning. Run the infrastructure: Docker and Kubernetes on AWS (EC2, S3, RDS), Nginx + Gunicorn, SSL/TLS, SSH hardening, Cloudflare WAF.

Tuned the PostgreSQL schema for read-heavy product pages with targeted indexes; no customer-facing outages to date. Stack: Python, Django, DRF, PostgreSQL, Redis, Celery, React, Docker, Kubernetes, AWS, Nginx, GitHub Actions, Cloudflare Freelance — Remote Jan 2023 – Present

Full Stack Developer

Independent full stack development for small business and startup clients: Java and Spring Boot on the backend, Angular on the frontend, delivered end to end.

Designed and built backend services in Java and Spring Boot with Spring MVC, applying SOLID principles and established design patterns.

Built and maintained REST APIs with clear resource modelling, correct status code semantics, and versioning. Modelled and queried relational data in PostgreSQL through JDBC and Spring Data, tuning indexes and rewriting slow queries to cut response times.

Built responsive Angular frontends in TypeScript with standalone components, reactive forms, routing, and RxJS-based state with signals.

Wired Angular clients to Spring REST backends through HttpClient with typed models and centralized error handling. Tested across the stack with JUnit and Mockito on the backend and Angular testing utilities on the frontend. Managed builds and dependencies with Maven and Gradle, producing repeatable multi-module builds. Containerized services with Docker and deployed to Kubernetes, keeping client environments reproducible from local to production.

Owned the full delivery cycle independently, from requirements and architecture through implementation, testing, deployment and maintenance, working directly with clients across 10+ projects. Stack: Java, Spring Boot, Spring MVC, REST APIs, PostgreSQL, JDBC, Angular, TypeScript, RxJS, JUnit, Mockito, Maven, Gradle, Docker, Kubernetes Real Estate Agent (CRECI-PB 8328) — Self-employed Jan 2016 – Present English Language Instructor — Senac Jan 2013 – Jan 2015 Operations & Systems Manager — Hotel Cabo Branco Atlântico Jan 2013 – Jan 2014 SELECTED PROJECTS

springboot-payment-api — Java 17 and Spring Boot 4 REST API for a payment lifecycle, layered behind a persistence interface. Spring Data JPA over PostgreSQL 16 with Flyway migrations and Hibernate schema validation. 29 tests, 10 of them against a real database in Testcontainers. GitHub Actions CI, JaCoCo at 75% instruction and 88% branch coverage. MIT licensed. ECOMMDEV Platform — Enterprise Django platform for services, packages and invoicing. 501 tests, 85% coverage, CSP, rate limiting, i18n.

CloudTask API — Serverless task processing in Python. 6 AWS Lambdas, API Gateway, DynamoDB, SQS, SNS, Terraform IaC, and CI/CD.

BabyHappy E-Commerce — Production Django + React storefront with live Cielo card payments. 179 tests, Docker, Kubernetes, CI/CD on AWS.

EDUCATION & CERTIFICATIONS

B.S. in Software Engineering (in progress) — UNINTER 2025–2029 Java Programming Specialized Certificate (Java I–IV) — UC San Diego Extension 2026 Front-End Development Specialized Certificate — UC San Diego Extended Studies 2025–2026 Design and Analyze Secure Networked Systems — University of Colorado Boulder Mar 2026 AWS Cloud Practitioner Essentials — Amazon Web Services Mar 2026 Meta Back-End Developer — Meta 2025

Real Estate License CRECI-PB 8328

LANGUAGES

English (Fluent) Portuguese (Native) Spanish (Native)

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