Hi, I’m Nigel Bungaroo Castelo Branco. I’m a Senior Full Stack Developer with 7+ years of experience building AI-integrated and Generative AI-powered web applications. I specialize in React, Next.js, and TypeScript frontends, and Python/Node.js backends, with strong experience using OpenAI APIs and Large Language Models to drive AI automation, predictive modeling, and real-time systems. I’ve delivered scalable cloud-based solutions that accelerate workflow automation, machine learning integration, energy optimization, and high-performance web experiences. In my roles, I focus on translating complex problems into robust architectures and delightful user experiences, collaborating closely with product, design, and operations teams to create measurable business value through technology.

Nigel Bungaroo

Hi, I’m Nigel Bungaroo Castelo Branco. I’m a Senior Full Stack Developer with 7+ years of experience building AI-integrated and Generative AI-powered web applications. I specialize in React, Next.js, and TypeScript frontends, and Python/Node.js backends, with strong experience using OpenAI APIs and Large Language Models to drive AI automation, predictive modeling, and real-time systems. I’ve delivered scalable cloud-based solutions that accelerate workflow automation, machine learning integration, energy optimization, and high-performance web experiences. In my roles, I focus on translating complex problems into robust architectures and delightful user experiences, collaborating closely with product, design, and operations teams to create measurable business value through technology.

Available to hire

Hi, I’m Nigel Bungaroo Castelo Branco. I’m a Senior Full Stack Developer with 7+ years of experience building AI-integrated and Generative AI-powered web applications. I specialize in React, Next.js, and TypeScript frontends, and Python/Node.js backends, with strong experience using OpenAI APIs and Large Language Models to drive AI automation, predictive modeling, and real-time systems. I’ve delivered scalable cloud-based solutions that accelerate workflow automation, machine learning integration, energy optimization, and high-performance web experiences.

In my roles, I focus on translating complex problems into robust architectures and delightful user experiences, collaborating closely with product, design, and operations teams to create measurable business value through technology.

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Language

English
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Portuguese
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Work Experience

Senior Full Stack Engineer at Monaire
October 1, 2023 - July 1, 2025
Developed full-stack features for an AI-driven HVAC optimization platform using React, Next.js, TypeScript, Python, PHP, and FastAPI. Built scalable dashboards and backend services with real-time energy visualizations, recommendations, and operational alerts. Integrated OpenAI APIs and predictive models to enhance automation, achieving a 25% improvement in maintenance prediction accuracy and approximately 18% energy optimization across commercial buildings. Optimized database queries and backend services, reducing API response times by 35% while maintaining a seamless user experience. Implemented prompt engineering strategies to improve AI response quality and engagement. Supported cloud deployment and ongoing maintenance of scalable AI-driven operations, collaborating with product managers, designers, and stakeholders from UI/UX to backend architecture.
Full Stack Engineer at Sibill
August 1, 2021 - July 1, 2023
Built full-stack financial management applications for SMEs using React, Node.js, and TypeScript. Developed responsive frontends and robust REST APIs for invoicing, cash flow tracking, and reporting. Implemented Generative AI and LLM-powered automation via OpenAI APIs, reducing manual work by over 5 hours per week through intelligent document processing and workflow automation. Designed and optimized PostgreSQL and MongoDB schemas to improve query performance under heavy load, and integrated third-party banking APIs to deliver seamless end-to-end experiences.
Software Engineer at Vocalime
February 1, 2019 - April 1, 2021
Contributed to enterprise conversational AI platforms (chatbots and voicebots) using Node.js and TypeScript. Built backend services for authentication, messaging, and data handling, and developed basic React components for internal tools and client dashboards. Assisted with NLP model integration and language API usage to improve chatbot conversations and intent recognition, enhancing performance and stability.

Education

Bachelor of Science in Computer Science at University of Milano-Bicocca
September 1, 2015 - July 1, 2018

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Energy & Utilities, Financial Services, Media & Entertainment, Professional Services