Старший фронтенд-инженер (React / TypeScript)

About Startale Startale Group is a global startup from Japan in the field of on-chain finance (Web3/blockchain) with the mission "To create the next civilization by moving the world on-chain". Based on its world-class technological competitiveness, the company collaborates with leading domestic and international partners to develop and provide products at both the application and infrastructure levels. As a "vertically integrated on-chain finance company" competing globally, we develop and provide all necessary layers: chains, stablecoins, payments, and applications. Together with SBI Group, we are working on creating the exchange "Strium," which can be called a fully on-chain version of the "Tokyo Stock Exchange," and have already launched Japan's first trust-type stablecoin in yen, "JPYSC." In collaboration with a joint venture with Sony Group, the blockchain "Soneium" for entertainment, we provide the digital asset super app "Startale App" as an entry point to this infrastructure. Raised approximately 10 billion yen in Series A from Sony, SBI, and others. "Startale App" is used by 170,000 users per month. At WebX in July 2026, the on-chain finance infrastructure for financial institutions "Startale OFK" and the Visa-supported "Startale Card" will be announced. The team consists of approximately 65 employees from 20 countries. Civilization has evolved through the invention of more advanced "value exchange systems." From an era when transactions were recorded on leaves or clay, to paper, and then to online systems. The next foundation is on-chain. Payment, asset trading — economic activity itself doesn't change. Only the "backend" changes. Just as nowadays, no one thinks about whether stocks are paper or data when buying stocks, in the future, no one will worry about whether they are tokens. They will simply become orders of magnitude faster, cheaper, and new financial services can be built on top of them. In the US, the tokenization of stocks and bonds is gaining momentum, and financial institutions' questions have shifted from "will it be implemented?" to "how to participate?"

Results and History Note from CEO Watanabe Mission: "To create the next civilization by moving the world on-chain" Started providing Japan's first trust-type stablecoin in yen, "JPYSC" Completed Series A fundraising totaling approximately 10 billion yen. Announced the fully on-chain L1 exchange "Strium" Started providing the Japanese version of Startale App

About This Vacancy As a Frontend Engineer at Startale, you will be responsible for one of the following products (responsibilities will be determined through discussion, considering experience and preferences).

Strium (fully on-chain exchange) — Building a trading UI from scratch Frontend for an exchange operating on a fully on-chain order book (CLOB) for spot and perpetuals. This is a UI that handles a large amount of real-time data — order book, charts, order/position management — and responds to trader actions without delay. On an exchange, performance directly impacts product value.

Startale App (digital asset super app) — Building an integration platform to support rapid growth A super app that integrates swap, bridge, card payments, earn, and stablecoins. The goal is "for users to be able to use it seamlessly, regardless of how complex the internal structure is." Post-launch, it is used by 170,000 users per month, and we aim for growth to several million users, and eventually to hundreds of millions. From a technical perspective, this is an FE architecture that supports an "integration platform connecting numerous in-house and third-party applications." The challenge lies in developing an unbreakable architecture that handles this complexity and enabling rapid development.

No prior blockchain experience is required for either position. We are looking for engineers with experience building large-scale consumer products and high-performance real-time interfaces. On-chain knowledge will be sufficient upon joining the team.

Advantages of This Position Opportunity to design a trading UI from scratch where performance dictates product value — order book, charts, order flows (Strium). FE architecture that "folds" multi-layered complexity (wallet (MPC/smart account), dApp (swap/bridge/on-ramp), integration with external protocols (Uniswap, Morpho, etc.)) into "a single application that can be used without confusion" (Startale App). You have full ownership of your product, not a contract role. An environment where you will use cutting-edge tools in your development workflow — AI agents for reviews and implementation assistance. "How to use AI to accelerate development" is itself a technical topic for the team.

Tech Stack and Development Culture Stack (Startale App) includes TypeScript/React/TanStack Start/Zustand/TanStack Query/Playwright (E2E)/SSR. The use of TanStack Start is one of the first in Japan. Development workflow based on AI coding agents, where they are used daily to assist with reviews and implementation. Code review criteria are maintained at a high level. Despite tight deadlines, we do not compromise on quality and perform refactoring in place if the architecture begins to break down. Team structure: chapter (FE/BE) × squad (by product). Squad teams conduct sprints independently under the guidance of PMs and engineers, working asynchronously as a global team.

Responsibilities Lead the development of system design, patterns, and best practices for frontend systems. Design and implement trading UIs — order book, charts, order and position management (Strium). Design and implement the entire FE workflow, including wallet interaction, real-time data handling, and dApp integration (Startale App). Implement production-quality code using TypeScript/React. Maintain and expand the E2E test suite based on Playwright. Collaborate with Product, Design, and Backend teams, participating in squad decision-making.

Required Qualifications Over 3 years of experience and advanced English proficiency, plus meeting three or more of the following requirements (working language in the company is English). Hands-on experience as a Frontend Engineer (approximately 4+ years). Deep knowledge of TypeScript and modern JavaScript. Experience with TanStack Start or similar frameworks (Next.js, Remix, etc.). Solid understanding of React patterns, performance optimization, and application design. Ability to independently resolve uncertainties and work autonomously in a fast-paced environment. English proficiency above conversational level (working language in the company is English. Native level not required). Desire and curiosity to quickly learn and master new domains (no blockchain experience required).

Preferred Qualifications Hands-on experience using AI coding tools (Claude, Cursor, Copilot, etc.). Experience with trading UIs, financial data visualization, real-time data handling (e.g., WebSocket) (especially when working on Strium). Experience in Web3/dApp development (especially when working on Startale App). Startup/scaling experience.

Who We Are Looking For Serious about winning in the world? — Ability to demonstrate a track record of achieving top-tier goals. Internally driven? — Prioritize "what to create" and "what impact to have" over rewards or position. Owns their work? — Ability to drive the product forward by discussing not only code but also with PMs, Backend, and DevOps. We will reject candidates who exhibit deficiencies in Integrity, Open & Transparency, regardless of their qualifications.

Conditions and Work Style Estimated Annual Income (Benchmark): Negotiable. Work Location: Tokyo Office. In principle, a hybrid format is recommended, but a fully remote format is possible under certain conditions. Annual company-wide workcation. (Past locations: Japan, Croatia, South Korea, Turkey, Singapore, Dubai). Periodic offline meetups. We spare no investment in AI tools and the development environment. Flexible Leave System: Flexible management allowing independent determination of leave days and times.

Selection Process Main Selection Stages (Informal chat) → Resume screening → First screening → Second screening → Technical test → Final screening → Job offer. After confirming the intention to proceed with selection, 1-3 interviews will be conducted before the final stage. During the selection process, you will meet several team members. In principle, selection is conducted online. Offline meetings, such as office visits, are possible if desired. The selection period is typically 2-5 weeks. Depending on the candidate's situation, individual arrangements are possible, such as completing all stages in 2 days. Reference letters will be requested at the final stage.

Information about Startale Career Page Culture Deck X (CEO Watanabe) X (Startale)