Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I'm Thoma Tagashira, a full-stack developer and technical founder with a passion for building scalable and secure SaaS, fintech, and data-driven platforms. I specialize in crafting end-to-end cloud-native solutions using technologies like Django, React, TypeScript, and AWS. I love transforming complex business requirements into reliable, production-ready software while collaborating closely with cross-functional teams. With experience leading projects from the ground up, including launching a SaaS platform for construction cost estimation and contract management, I enjoy solving challenging problems and continually adapting to new technologies. When I'm not coding, I engage with developer communities and contribute to innovative projects involving AI and real-time data workflows.…Hi, I'm Thoma Tagashira, a full-stack developer and technical founder with a passion for building scalable and secure SaaS, fintech, and data-driven platforms. I specialize in crafting end-to-end cloud-native solutions using technologies like Django, React, TypeScript, and AWS. I love transforming complex business requirements into reliable, production-ready software while collaborating closely with cross-functional teams. With experience leading projects from the ground up, including launching a SaaS platform for construction cost estimation and contract management, I enjoy solving challenging problems and continually adapting to new technologies. When I'm not coding, I engage with developer communities and contribute to innovative projects involving AI and real-time data workflows.

Thoma Tagashira

Full Stack Developer, Developer, App Developer, +2





Hi, I'm Thoma Tagashira, a full-stack developer and technical founder with a passion for building scalable and secure SaaS, fintech, and data-driven platforms. I specialize in crafting end-to-end cloud-native solutions using technologies like Django, React, TypeScript, and AWS. I love transforming complex business requirements into reliable, production-ready software while collaborating closely with cross-functional teams. With experience leading projects from the ground up, including launching a SaaS platform for construction cost estimation and contract management, I enjoy solving challenging problems and continually adapting to new technologies. When I'm not coding, I engage with developer communities and contribute to innovative projects involving AI and real-time data workflows.…Hi, I'm Thoma Tagashira, a full-stack developer and technical founder with a passion for building scalable and secure SaaS, fintech, and data-driven platforms. I specialize in crafting end-to-end cloud-native solutions using technologies like Django, React, TypeScript, and AWS. I love transforming complex business requirements into reliable, production-ready software while collaborating closely with cross-functional teams. With experience leading projects from the ground up, including launching a SaaS platform for construction cost estimation and contract management, I enjoy solving challenging problems and continually adapting to new technologies. When I'm not coding, I engage with developer communities and contribute to innovative projects involving AI and real-time data workflows.

Available to hire

Hi, I’m Thoma Tagashira, a full-stack developer and technical founder with a passion for building scalable and secure SaaS, fintech, and data-driven platforms. I specialize in crafting end-to-end cloud-native solutions using technologies like Django, React, TypeScript, and AWS. I love transforming complex business requirements into reliable, production-ready software while collaborating closely with cross-functional teams.

With experience leading projects from the ground up, including launching a SaaS platform for construction cost estimation and contract management, I enjoy solving challenging problems and continually adapting to new technologies. When I’m not coding, I engage with developer communities and contribute to innovative projects involving AI and real-time data workflows.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Japanese

Fluent

Work Experience

Software Engineer (Contract) at Upwork

June 1, 2025 - Present

Engineered reusable brokerage API platforms supporting live/historical options trading with E*TRADE, Tastytrade, Public, and LightSpeed. Automated complex data flows for quote retrieval, order placement, and account management using Python async programming and multi-threaded optimization. Designed secure REST/OAuth workflows for multi-account, multi-broker expansion, ensuring compliance and reliability for enterprise use cases. Integrated custom websocket connections for real-time data ingestion from external APIs (e.g., Polygon for LightSpeed). Collaborated directly with technical and non-technical stakeholders to refine requirements and deliver production-ready solutions.

Technical Founder / Full-Stack Engineer at FairBuild

September 1, 2022 - Present

Launched a cloud-native SaaS platform (fairbuildapp.com) for cost estimation and contract management in construction and home services. Architected the platform using Django, React, PostgreSQL (RDS), and AWS, maintaining 99% uptime for early adopters. Built secure APIs, Stripe-integrated billing, and Docker-based CI/CD pipelines to support automated deployments and continuous delivery. Implemented OpenAI embeddings and PGVector for fast semantic search, boosting user productivity and data relevance. Led cross-functional teams in iterative feature delivery, testing, onboarding, and technical documentation.

Operations Manager at Ocean Beauty Seafoods, LLC.

January 31, 2022 - July 15, 2025

Directed cross-functional logistics, supply chain, and IT system upgrades for a major food distributor. Implemented new tracking, reporting, and analytics solutions to improve operational efficiency. Managed 7 department heads and 50–100 staff, reporting to executive leadership.