Hey, I'm Pablo
Software Engineer | Ex-Founder cosseno.com
Full-stack software engineer building things like cosseno.com (JS stack). Competitive programming nerd, 2x summer intern in Tokyo and also some tech content here 🤓💻☝️
Brasília, Brazil
Experience
Developer & Founder
Cosseno
May 2021 – July 2025
Brasília, Brazil
Founding Team
- • Designed and scaled an EdTech platform reaching 50,000+ students and B2B partnerships with schools;
- • Built full-stack architecture with Nuxt.js, Node.js, and GCP; leveraged Cloud Functions, containerized services, and video streaming tools to integrate multiple microservices, supporting 10k+ monthly active users.
- • Led development of CossenoGPT, an AI chatbot integrated with WhatsApp and web, leveraging RAG pipelines, and real-time message delivery. Processed 300k+ student queries with low latency across 20k+ users.
- • Implemented SEO and performance improvements that contributed to 600k+ annual organic impressions.
Software Engineer
AOBA BBT
Internship Nov 2024 – Dec 2024
Tokyo, Japan
Global platform team
- • Developed and presented the Japanese MVP of Cosseno to the CEO, adapting the platform for local validation.
- • Implemented internationalization with i18n, enabling multi-language support for Japanese education workflows.
- • Adapted backend infrastructure to handle unstructured exam data, supporting unique requirements of the Japanese higher-education system.
- • Collaborated with the global AOBA BBT engineering team through technical reviews and sprint planning, ensuring alignment with product roadmap.
Software Engineer
KT VACE
Internship Jan 2023 – Feb 2023
Tokyo, Japan
Online services team
- • Designed and implemented the MVP of an NFT e-commerce platform leveraging Shopify APIs and smart contract integration, enabling seamless transactions.
- • Built custom Web3 infrastructure with Ethereum-based libraries such as Web3.js and Ethers.js, ensuring reliable smart contract interactions and secure on-chain transactions.
- • Delivered a functional prototype that validated the technical and business feasibility of the NFT marketplace.
Software Engineer
BTG Pactual
Internship Oct 2022 – Dec 2022
São Paulo, Brazil (remote)
Finance & Risk Team
- • Refactored and optimized 12+ financial reporting dashboards for risk analysts, reducing average load time by 20%.
- • Contributed to UX/UI analysis and redesign, increasing analyst productivity and adoption across internal teams.
- • Collaborated with a large engineering team in an Agile environment, delivering new features and bug fixes.
Skills
🌐 Web Development
JavaScript Stack
Nuxt.js, Node.js, TypeScript
Cloud & Backend
Google Cloud Platform, Supabase
Frontend
React, Vue, Tailwind CSS
🤖 Python ML/AI
AI & Machine Learning
RAG Pipelines, Classical ML Models
Data Analytics
Pandas, Matplotlib, Seaborn
Microservices
Streamlit, FastAPI
🏆 Competitive Programming
C++ Expertise
Algorithms & Data Structures
Problem Solving
Mathematical Optimization
Competitions
ICPC, OBI, Maratona SBC
Projects
📱 Content Creation
Producing educational and tech content on Instagram, sharing insights about programming, competitive programming, and software development journey.
💪 Fellas - Fitness Management
Web application designed to help people manage their physical activities and fitness routines. Built with modern web technologies for optimal user experience.
🎓 Automated Question Generation using T5 Models
Bachelor's thesis investigating Automated Question Generation in Portuguese using T5 models, with emphasis on open-ended questions and an exploratory module for multiple choice. The approach combines answer extraction with answer-aware generation and automatic evaluation using SQuAD dataset.
Key Technologies
T5-small (~60M params), PTT5 for Portuguese, SQuAD dataset
Results
METEOR 0.30 (PT), BLEU-4 0.13, ROUGE-L 0.39
Extracurricular Activities
ICPC Brazilian Regionals 2023: 24th (2023); Selected for Brazilian ICPC Summer School 2024 (UNICAMP);
Huawei Seeds for the future 2022 program.
OBF Regionals 2018: 1st place in region (Brasília, Brazil).
IYPT Brazilian finals 2018: Bronze medal.
Education
Bachelor in Computer Engineering (BSc)
University of Brasilia (UnB)
2019–2023/24
GPA: 4.45/5.0
Leadership Development Program
ProLíder - Harvard and MIT Immersion
2025
Highly selective program (<1% acceptance rate) focused on developing leadership skills and entrepreneurial mindset.
Immersive experience at Harvard Business School and MIT, covering strategic leadership, innovation management, and global business perspectives.
Focus: Leadership Development, Strategic Thinking, Innovation Management