Staff Fullstack Engineer

Responsibilities

• Own the architecture and technical roadmap for how customers access and use Trading API: identity and authentication, authorization and permissions, account and sub-account models, partner OAuth, and customer-facing trading and account-management applications.
• Design the access model for increasingly complex account structures — multiple users per account, sub-accounts, entity and advisor accounts, and delegated API and agent access — so that permissions are explicit, auditable, and enforced on the server.
• Lead technical delivery of next-generation Trading API customer applications, including real-time market data, order entry, and positions and order views, as the product expands to new customer surfaces.
• Drive the move from legacy monolith endpoints to a dedicated application backend, with clear API contracts between customer applications and platform services such as trading, accounts, transfers, ledger, and market data.
• Set the security bar for customer-facing systems: session and credential handling, MFA and passkeys, OAuth flows, rate limiting, input validation, and fast, durable responses to security findings.
• Set the standard for safe delivery: feature flags, staged rollouts, preview environments, testing strategy, and production observability.
• Partner with Product
• Design, Compliance, Security, Brokerage Operations, and adjacent engineering teams to define behaviour and integration boundaries.
• Lead design reviews, mentor senior and mid-level engineers, and raise the engineering bar as the team grows.
• Act as a technical point of escalation for production issues on customer-facing Trading API systems, and drive durable prevention after incidents.

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