Variational - Fullstack Engineer

Variational is building a protocol that provides infrastructure for peer-to-peer trading, clearing, and settlement of perpetuals and generalized derivatives. The protocol enables safe and efficient bilateral trading across a wide range of instruments, including options, futures, perpetuals, exotics, and more. Multiple applications are being built on top of the protocol, including products for perpetuals trading and institutional-grade customizable OTC derivatives.

The company is backed by leading investors such as Bain Capital Crypto, Peak XV (formerly Sequoia India/Southeast Asia), Coinbase Ventures, Dragonfly, Hack VC, North Island Ventures, Caladan, Mirana Ventures, and Zoku Ventures, having raised over $50M. The team is currently ~15 people, predominantly engineers, and is planning to double or triple in size over the next two quarters.

This role is primarily frontend-focused within a fullstack scope. You will be responsible for building trading interfaces and product experiences across the company’s applications, working across the stack with a strong emphasis on frontend development.

The team has strong in-house design and product leadership, allowing engineers to focus on high-quality implementation. However, candidates with a design mindset are encouraged to contribute to UX decisions, especially at the senior level. This is a small, high-ownership environment where you will be expected to own and deliver frontend systems end-to-end, rather than working on isolated features within a large, mature codebase.

Responsibilities include:

• Building and owning frontend trading interfaces using TypeScript and Svelte (or equivalent modern frameworks)
• Implementing fullstack features, including backend API development in Rust, Go, or Python
• Optimizing performance across frontend and backend (CDNs, SSR, real-time data systems)
• Owning frontend security, including secure coding practices, XSS/CSRF prevention, and deployment/DNS configuration
• Implementing fullstack security measures such as SQL injection prevention, JWT authentication, and WAF configuration
• Maintaining CI/CD pipelines, containerized deployments, and end-to-end test automation
• 5+ years of fullstack development experience using modern technologies, with strong understanding of both frontend and backend performance optimization
• Strong proficiency in TypeScript and extensive experience with:
• Svelte (preferred)
• React, Vue, or similar modern frameworks

(Svelte is considered easy to learn for candidates coming from React/Vue — not a strict requirement)

• Backend or fullstack experience strongly preferred to ensure a well-rounded engineering skillset, although the role remains primarily frontend-focused
• Strong proficiency in SQL and extensive experience working with relational databases
• Advanced knowledge of frontend and fullstack security, including:
• XSS / CSRF prevention
• JWT authentication
• WAF configuration
• SQL injection prevention

Bonus Skills

• Experience with trading platforms, dashboards, DeFi, or similar domains
• Experience integrating crypto wallets
• Rust proficiency
• Svelte / SvelteKit proficiency
• Experience with PostgreSQL and Redis
• Strong design sense / UX mindset (not required, but highly valued)
• Security expertise, with the ability to own frontend security end-to-end