Open to opportunities

Claudenes Santos

@claudenessantos

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Senior full‑stack developer delivering scalable cloud‑native web applications.

Brazil

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What I'm looking for

I want a role building scalable, reliable cloud‑native systems where I can lead migrations, improve performance, and mentor engineers.

I am a senior full‑stack developer with nine years of experience building and scaling production web applications using React/Next.js, Node/NestJS, Python, Go, and cloud‑native architectures on AWS.

I have led migrations from legacy stacks to modern microservices, improved performance via server‑side rendering and smart caching, and introduced observability and CI/CD practices that turned manual releases into routine deploys.

My work spans frontend, backend, and mobile: shipping user interfaces from Figma to React/Next.js, authoring APIs in NestJS/Django/SpringBoot, and building an offline‑first React Native companion app for field technicians.

I mentor engineers, standardize API contracts and error handling, and design reliable event‑driven systems (RabbitMQ, idempotent consumers, DLQs). I seek opportunities to drive system reliability, developer productivity, and measurable product performance improvements.

Experience

Work history, roles, and key accomplishments

Senior Fullstack Developer

Octobot

Aug 2022 - Dec 2025 (3 years 4 months)

Owned end-to-end delivery of web features and migrated a legacy PHP portal to Next.js + NestJS backed by PostgreSQL and Redis, reducing page load times and stabilizing traffic spikes; introduced CI/CD, blue/green deploys and observability to shorten incident resolution. Built React Native offline-first app for field technicians, tuned data access and background jobs to keep p95 latency steady duri

React Next.js NestJS PostgreSQL Redis Docker AWS CI CD RabbitMQ

Mid-Senior Fullstack Developer

WeAreBrain

Aug 2019 - Jul 2022 (2 years 11 months)

Built and maintained Laravel/Symfony APIs and a React dashboard with SSR and caching, introduced Redis caching and RabbitMQ workers to improve responsiveness under load; implemented NestJS reporting service with streaming exports and GitLab CI-driven containerized deployments. Delivered preview environments to speed and secure reviews.

Laravel Symfony React NestJS Redis RabbitMQ Docker Gitlab CI PostgreSQL

Junior Fullstack Developer

Netinteractive

Jul 2017 - Jul 2019 (2 years)

Built an internal inventory/compliance dashboard (React + Express) with role-based access and audit logs, created Python/SQL nightly reconciliation jobs to eliminate manual spreadsheets and reduce data drift, and added Redis caching and automated tests to improve reliability.

React Express Python SQL Redis Testing REST APIs Docker

Education

Degrees, certifications, and relevant coursework

Warsaw University of Technology

Bachelor's Degree, Computer Science

2013 - 2017

Grade: 4.6/5.0

Activities and societies: Led development of multiple team projects leveraging JavaScript and backend technologies.

Bachelor's Degree in Computer Science with advanced coursework in algorithms, distributed systems, and software engineering; graduated with a 4.6/5.0 GPA and ranked in the top 5% of the class.