Tomohiro Kondo
Verified Expert in Engineering
Software Developer
Tokyo, Japan
Toptal member since October 30, 2024
Tomo is a senior full-stack developer with 8+ years of experience in cloud architecture, full-stack development, and system optimization. He's well-versed in AWS, microservices, CI/CD, containerization, AI, and blockchain technologies. Besides his strong proficiency in React, TypeScript, Node.js, and Python, Tomo is a strong team collaborator and mentor.
Portfolio
Experience
- JavaScript - 9 years
- Python 3 - 8 years
- MongoDB - 7 years
- React - 7 years
- Node.js - 6 years
- TypeScript - 6 years
- Web3.js - 4 years
- Next.js - 4 years
Availability
Preferred Environment
Python, Serverless, APIs, HTTP, Performance, GitHub, Relational Databases
The most amazing...
...solution I've developed is an AI-driven photo platform that generated over five million images and boosted user engagement by 25%.
Work Experience
Senior Full-stack Developer
Zoth
- Built a blockchain-based platform for tokenizing and trading real-world assets using React, Vue, Next.js, Node.js, and Python.
- Architected a microservices system with Kafka, GraphQL, and REST APIs, enabling real-time transactions and seamless blockchain integration.
- Designed secure wallet integrations (MetaMask, WalletConnect) with Web3.js and Ethers.js, enhancing user interactions in the decentralized finance ecosystem.
- Designed and implemented complex data validation and transformation pipelines with Node.js (Nest.js), ensuring seamless integration across systems.
- Architected and maintained cloud-native solutions on Azure, focusing on API design and authentication mechanisms for distributed systems.
- Managed databases (MongoDB, PostgreSQL) to store transactional and user data with high security and integrity.
- Leveraged Supabase to implement robust back-end solutions, utilizing its PostgreSQL database, real-time subscriptions, and authentication features to streamline development workflows and ensure high performance.
- Migrated on-premises applications into Azure-based serverless environments, streamlining application management and reducing infrastructure overhead.
- Developed responsive and dynamic UIs using React Context API, Redux Toolkit, and modern libraries like D3.js for data visualizations.
- Optimized back-end workflows with Python Asyncio, Node.js Streams, and GraphQL subscriptions for real-time updates.
Full-stack Developer
Artisse
- Developed a scalable AI-powered photo generation platform using React, Next.js, Node.js, and GraphQL, delivering high-quality, AI-enhanced visuals.
- Built back-end services leveraging AWS Lambda, API Gateway, DynamoDB, Azure Functions, API Management, and Cosmos DB to implement serverless architectures with rapid response times, scalable solutions, and low operational costs.
- Automated deployment pipelines with GitHub Actions, AWS CodePipeline, and containerized apps on AWS Fargate for managed scalability.
- Designed user-facing APIs with Express.js and implemented JWT authentication for secure access to AI models.
- Leveraged Microsoft Azure (Azure API Management, Azure Functions, and Logic Apps) to build and deploy serverless API infrastructures tailored for enterprise-grade applications.
- Enhanced system reliability with Elasticache (Redis) for caching and RDS Multi-AZ for database fault tolerance.
- Built interactive dashboards with Material UI and React Query, improving user experience through dynamic UI updates.
- Optimized back-end code with Node.js cluster and worker threads, handling increased concurrency for high-traffic events.
- Streamlined real-time image rendering using WebSocket communication, improving interactivity for eCommerce users.
- Integrated 3rd-party AI APIs (e.g., Google Vision API, OpenAI GPT) to enhance the platform’s image recognition and personalization features.
Web Developer
Capgemini
- Developed enterprise-grade applications using React.js, Redux, and Django, providing robust solutions for healthcare and retail clients.
- Designed secure, scalable REST APIs with Django REST Framework, integrating data from multiple third-party systems.
- Automated cloud infrastructure using AWS CloudFormation and deployed scalable applications on EC2 with ALB.
- Implemented back-end services with Django ORM, PostgreSQL, and Redis, achieving high database performance and scalability.
- Integrated Amazon S3 and CloudFront for media content storage and accelerated global content delivery.
- Developed multi-layer authentication using OAuth2 and Amazon Cognito, improving system security.
- Collaborated with front-end teams to build modular and reusable UI components with React Hooks and CSS-in-JS libraries like Styled Components.
- Designed data migration scripts and ETL pipelines using Python for legacy system integrations.
- Integrated third-party payment gateways (e.g., Stripe, PayPal) to support multi-currency transactions and improve user experience.
- Enhanced SEO performance for React apps by implementing Next.js features such as server-side rendering (SSR) and static site generation (SSG).
Software Developer
TechMagic
- Built interactive, user-friendly web applications using HTML5, CSS3, and JavaScript (ES6+), ensuring responsive designs across all devices.
- Migrated legacy systems to React-based SPAs, modernizing the UI and improving user engagement metrics.
- Developed back-end APIs with Express.js, leveraging MongoDB and PostgreSQL for high-performance data access.
- Implemented caching strategies with Memcached and Redis, significantly improving response times for high-traffic applications.
- Built secure, scalable microservices using Docker Compose and Amazon ECS, enabling seamless deployments.
- Automated CI/CD workflows with Jenkins, GitLab CI, and AWS CodeBuild, ensuring continuous delivery of features.
- Integrated APIs with OAuth2, JWT, and third-party services for streamlined authentication and data sharing.
- Enhanced back-end performance by implementing indexed queries, stored procedures, and connection pooling in PostgreSQL.
- Developed and deployed scalable back-end applications leveraging Google Cloud Platform (GCP) services, including BigQuery and Cloud SQL, to optimize performance and enhance data-driven functionalities for diverse projects.
- Worked in Agile environments, participating in code reviews and mentoring junior developers on best practices.
Experience
Valyu
https://www.valyu.network/Valyu developed a data card standard that is used in the Valyu Open Data Provenance dashboard. The data card is structured into three main components, each designed to provide a holistic view of the dataset's lineage, characteristics, and provenance, ensuring a thorough understanding of its origins, transformations, and current state.
Zotto
https://zotto.aiB2B Multimedia Localization SaaS Platform
https://glober.aiEducation
Bachelor's Degree in Computer Science
The University of Tokyo - Tokyo, Japan
Skills
Libraries/APIs
React, Node.js, Web3.js, SQLAlchemy, Google Ads API, SendGrid API, MobX, Amazon API, Amazon Product Advertising API, NumPy, Pandas, REST APIs, React Redux, D3.js, OpenAI API, Stripe, React Query, Three.js, WebGL, Asyncio, Django ORM, TanStack Table, Microsoft Authentication Library (MSAL), HTMX, API Development, Azure API Management, PyTorch, TensorFlow, Vue, Google Maps, ReportLab, YouTube API, Interactive Brokers API
Tools
Git, Amazon EKS, AWS SDK, Webpack, Figma, AWS Step Functions, SendGrid, Auth0, BigQuery, Drizzle ORM, Shadcn, Capacitor, Prisma, Canvas, Amazon Cognito, Spine, Lighthouse, WebPageTest, AWS CloudFormation, Terraform, GitHub, Cucumber, AWS CodeDeploy, Amazon CloudWatch, Amazon Elastic Container Service (ECS), Plotly, Adobe Experience Manager (AEM), RabbitMQ, Celery, Amazon Simple Notification Service (SNS), Amazon Simple Queue Service (SQS), Apache Airflow, CircleCI, Bubble, Nessus, MetaMask, AWS IAM
Languages
JavaScript, TypeScript, Python 3, HTML5, CSS, GraphQL, Solidity, Rust, SQL, HTML, Python, SCSS, C++, Snowflake, C#, C#.NET, ECMAScript (ES6), SAML, Bash, HTL, Less, PHP, Angular 18, Go, CSS3, JavaScript 6
Frameworks
Next.js, Jest, Django, Material UI, Redux, Tailwind CSS, NestJS, Flask, Express.js, React Native, Angular, .NET, tRPC, Remix, Django REST Framework, Flutter, Svelte, Cosmos SDK, Nuxt.js, AngularJS, Cypress, Bootstrap, Express.io
Paradigms
DevOps, Event-driven Architecture, UI Design, UX Design, Serverless Architecture, Automation, Responsive, Web Architecture, Search Engine Optimization (SEO), Web Performance Optimization (WPO), Microservices, Testing, Unit Testing, ETL, Test-driven Development (TDD), REST
Platforms
Apache Kafka, AWS Lambda, Amazon EC2, Docker, Kubernetes, Ethereum, Blockchain, Google Cloud Platform (GCP), Music Streaming, Amazon Web Services (AWS), Firebase, Visual Studio Code (VS Code), Azure, Twilio, Vercel, Netlify, Heroku, AWS IoT, Databricks, Shopify, PostHog, Storyblok, Amazon, Decentralized Exchanges (DEXs)
Storage
MongoDB, PostgreSQL, NoSQL, Redis, Databases, MySQL, Amazon S3 (AWS S3), Redshift, Microsoft SQL Server, Cloud Firestore, JSON, Relational Databases, Amazon DynamoDB, Google Cloud
Industry Expertise
E-learning, Healthcare, Cybersecurity, Trading Systems
Other
Ethers.js, GitHub Actions, CI/CD Pipelines, Artificial Intelligence (AI), FastAPI, Lazy Loading, Hugging Face, OpenAI, Front-end, Back-end, Distributed Systems, System Architecture, Full-stack, Serverless, Responsive Design, Web Animation, Payment APIs, APIs, MERN Stack, Open Source, Startups, Dashboards, Data Visualization, User Experience (UX), User Interface (UI), Queuing Systems, Surescripts, Architecture, Full-stack Development, Large Language Models (LLMs), Machine Learning, Web Development, Education, Educational Portals, Chakra UI, Mobile Apps, Amazon RDS, API Integration, Supabase, Algorithmic Trading, Cloud Infrastructure, Natural Language Processing (NLP), WebSockets, Product Development, SaaS Product Management, SaaS, AWS Secrets Manager, Back-end Development, Content Management Systems (CMS), Customer Relationship Management (CRM), Security, Website Data Scraping, Data Build Tool (dbt), Reporting, Web Scraping, Fleet Applications, Fleet Management, Maps, Open Charge Point Protocol (OCPP), HTTP, AI Tools, Large-scale Projects, Responsive UI, Front-end Development, Minimum Viable Product (MVP), Cryptocurrency, Ethereum Virtual Machine (EVM), Data Management, Optimization, Performance, Retrieval-augmented Generation (RAG), Fintech, Apollo, BullMQ, Caching, Front-end Architecture, SSG, Scalability, Server-side Rendering (SSR), Software Architecture, Static Site Generators, Web Scalability, Application State Management, Core Web Vitals, A/B Testing, Accessibility, Chrome DevTools, Cloudflare, Web Accessibility, Web3, WebAssembly (Wasm), Zustand, Generative Pre-trained Transformers (GPT), Chatbots, Data Scraping, Strapi, Open-source LLMs, 3D, Multithreading, Multiprocessing, Finance APIs, Integration, OAuth, SAML-auth, Responsiveness, PDF, Generative Artificial Intelligence (GenAI), Image Generation, Vector Databases, Foundry, Vite, Cybersecurity Automation, django tenant, Authentication, Indexing, OpenAI GPT-3 API, Storybook, ECS, Argo CD, Technical Leadership, Solana, Mobile First, Progressive Web Applications (PWAs), eCommerce, Statsig, NetSuite, WYSIWYG Web Builders, Supabase Auth, Headless CMS, Squarespace, Smart Contracts, WeasyPrint, WalletConnect, Image Processing, React Hooks, Code Splitting, Version Control, Decentralized Finance (DeFi), TradingView, Data Structures, Algorithms, Operating Systems, OSI Model, Complex Problem Solving, Discrete Mathematics, Calculus, Linear Algebra, Computer Science
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