Eyji Koike Cuff

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Senior Software Engineer with 5+ years of experience architecting and building scalable, secure backend systems and full-stack applications.

Latest blog posts

Skills

PROGRAMMING:

Python (Django, FastAPI, Flask)Node.jsJavaScriptReact.js (TypeScript, Next.js)REST APIsGraphQL (Hasura)

TOOLS:

HasuraSupabasePuppeteerSeleniumDockerTerraform (Infrastructure as Code, IaC)CI/CDVercel

AI/ML:

Generative AI (Prompt Engineering, RAG Pipelines, Hugging Face)LLM orchestration (LangChain, LlamaIndex)Vector Databases (ChromaDB, FAISS)

LANGUAGES:

PortugueseEnglish C1Spanish B2

Experience

PlanetBids Inc.

California, USA (Remote)

Full Stack Software Engineer

March, 2026 - Present

  • Architected and led the end-to-end development of a new evaluator management system, modernizing a legacy workflow to handle governmental bidding processes.
  • Engineered a secure Node.js/Prisma microservice from the ground up to manage the entire evaluator lifecycle, featuring immutable audit trails, role-based access control (RBAC), and secure data handling for compliance.
  • Designed and implemented robust eSignature provider integrations (e.g., DocuSign, Adobe Sign) to automate legally-binding contract execution, resolving critical production bugs in token management and envelope routing.
  • Developed a highly performant React UI with real-time search and full keyboard accessibility, contributing to a 600% performance improvement in evaluator assignment workflows.
  • Closed critical security vulnerabilities by migrating authorization logic from the client to the service layer, significantly enhancing data integrity and system security.

Testbox Inc.

California, USA (Remote)

Software Engineer (Customer Integrations)

May, 2024 - March, 2026

  • Built and maintained robust Python (Django) backend services and integrations with customer APIs to automate data ingestion and power dynamic demo environments.
  • Engineered a cache-aside system using Redis ElastiCache to optimize database queries and Lambda execution, reducing query duration by 10x and improving system performance.
  • Extended platform functionality by contributing to frontend features using React.js and TypeScript.

Eztronic

Caxias do Sul, Brazil

Mid Level Software Engineer

Oct, 2022 - May, 2024

  • Engineered full-stack applications interacting with cloud services and distributed devices using Python, Node.js, and React over BLE, Serial, and Ethernet.
  • Constructed high-frequency (600Hz) data pipelines within a Docker-based system to capture sensor data and display it on a live local webpage.
  • Led client-facing projects from requirement gathering to delivery, ensuring solutions met technical scope, performance, and budget goals.

Auttom

Caxias do Sul, Brazil

Business Data Analyst Intern

Aug, 2022 - Mar, 2023

  • Developed interactive Power BI dashboards and automated ETL pipelines in Python to support business intelligence and streamline departmental decision-making.

Federal Institute of Education, Science, and Technology

Caxias do Sul, Brazil

Research Intern

Oct, 2021 - Oct, 2022

  • Volunteered in the development of an IoT turnstile proof of concept, producing the firmware written in C and a secure cloud infrastructure in Google Cloud Platform and Firebase, reducing latency to a 2s delay between the sensor and the front end.
  • Collaborated with front-end developers to deploy a Python front-end with React.js to stream data in real-time, and project leads to produce a pitch and present it to the sponsor company as a valuable modernization option for their product.
  • Educated teenagers in a low-income school to entice their curiosity and promote STEM education.

Want to know more?

Download my resume for a comprehensive overview of my experience, skills, and achievements in full-stack development and AI/ML.

5+
Years Experience
10x
Performance Boost
Passion for Tech