UPSIDER to Sponsor TSKaigi 2026 with Notable Engineering Sessions

UPSIDER to Sponsor TSKaigi 2026

UPSIDER, led by CEO Tohru Miyagi, announces its participation as a platinum sponsor for the upcoming TSKaigi 2026, scheduled for May 22nd and 23rd. This leading conference focuses on TypeScript and is recognized as one of Japan's largest technology gatherings dedicated to this programming language. The event aims to foster learning, connection, and an innovative atmosphere for engineers.

After a successful introduction in 2024 and a successful follow-up in 2025, TSKaigi will offer a platform for numerous sessions that delve into an array of TypeScript-related topics. For this year's event, three prominent engineers from UPSIDER have been selected to present their insightful proposals.

Featured Sessions by UPSIDER Engineers

1. Connecting Multiple Products with Type Safety: Practical Implementation of "Type Contracts"

- Date & Time: May 22nd, 2026, 16:50 - 17:00
- Track: UPSIDER Track
- Session Page: Link
- Presenter: Tatsuhiro Mitsui, Engineering Manager at UPSIDER

This session will detail the use of TypeSpec as a foundational tool for type contracts, showcasing the construction of an automated pipeline for generating Zod, API clients, and MSW mocks. The presentation will also highlight how to share schemas as npm packages, enabling compile-time detection of cross-service interface changes.

2. Are TypeScript Types Reaching AI? – Insights from IDE Interaction with AI Coding Tools

- Date & Time: May 22nd, 2026, 17:00 - 17:10
- Track: UPSIDER Track
- Session Page: Link
- Presenter: Akihiro Nakata, Software Engineer at UPSIDER

In this session, Nakata will explore the findings of a study conducted on various AI coding tools including Claude Code, Cursor, GitHub Copilot, Codex, and Gemini. He reveals that structural type information is largely unrecognized by these tools and will clarify what information is communicated and what remains obscured, comparing three design philosophies for Language Server Protocol (LSP).

3. Mastering Over 400 Data Points with TypeScript in our Credit Assessment Engine

- Date & Time: May 23rd, 2026, 11:10 - 11:40
- Track: UPSIDER Track
- Session Page: Link
- Presenter: Yusuke Izumi, VP of Engineering at UPSIDER

Izumi will share strategies on how to manage over 400 data points using type control in a credit assessment engine built on Next.js/TypeScript. This presentation will highlight the method to unify front-end and back-end through a single interface while ensuring both flexibility and robustness in TypeScript implementation.

Booth and Engagement at TSKaigi 2026

UPSIDER will also host a booth throughout the conference where visitors can experience interactive content related to TypeScript and receive exclusive promotional items. Attendees are encouraged to stop by and engage with team members to discuss the transformative impact UPSIDER has made in the financial tech sector.

Notable After-Conference Event

An after-conference event will also be co-hosted by UPSIDER along with eight sponsor companies. The event titled TSKaigi Night Talks - after conference seeks to bring together insightful knowledge from the TSKaigi community, especially from those proposals that couldn’t make it to the main conference.

- Date & Time: June 10th, 2026, 19:00 - 21:20
- Venue: Findy Inc. Office, Ohsaki Art Village Central Tower 5th Floor
- Cost: Free
- Event Page: Link

About UPSIDER

Founded in May 2018, UPSIDER aims to create a global financial platform that empowers emerging challengers through AI and technology-driven financial infrastructure. The company provides an array of services, including the innovative corporate card "UPSIDER," which has processed over 8.5 trillion yen in payments as of November 2025, along with various automated solutions designed to alleviate operational burdens for SMEs and startups. With over 100,000 companies utilizing its services, UPSIDER continues to lead the charge in redefining financial services in Japan and beyond.

For more information regarding UPSIDER, visit their website.