Full-Stack Engineer (Go + React)
Summary
Builds full-stack crypto custody features in Go (backend) and React (frontend), designing domain-driven systems, securing data, and ensuring observability for a Series A MPC-based platform.
About us
The Vault, an MPC-based crypto custody platform for institutional and retail customers. We run threshold signing with non-extractable key shares across HSM and Ledger hardware, support a growing surface of chains and assets, and are pushing toward post-quantum readiness and SaaS-grade scale. Series A is ahead, the 2026 productized launch is in flight, and we publish original cryptographic research alongside the product work.
What you’ll do
- Build end-to-end product features across Go backend and React frontend
- Design backend services using DDD patterns (bounded contexts, aggregates, domain events), clean layering, and pragmatic architecture
- Implement data models and migrations on PostgreSQL, using GORM where appropriate (and raw SQL when it’s the right tool)
- Build and maintain REST APIs (and webhooks/event-driven workflows where needed)
- Implement frontend flows in React (TypeScript preferred): dashboards, admin workflows, status lifecycles, audit views
- Ensure correctness and observability: structured logging, metrics, tracing, and production-ready error handling
- Contribute to security fundamentals: RBAC, least-privilege access, safe secrets handling, and audit trails
- Own quality: unit/integration tests, contract tests, and CI pipelines
- AI-assisted development: use Cursor/Copilot (or similar) daily to accelerate delivery, refactoring, and test generation—while verifying outputs and keeping code clean
Must-have experience
- 5+ years building production systems with Go and React
- Strong backend fundamentals: concurrency, APIs, reliability, debugging
- Hands-on with DDD (not just buzzwords): can model domains and keep boundaries clean
- Strong PostgreSQL skills: schema design, indexing, query tuning, migrations
- Experience with GORM (or similar ORM) plus comfort dropping to SQL when needed
- Frontend proficiency in React (TypeScript preferred), including state management and form-heavy admin UIs
- Good testing discipline (Go testing, integration tests; frontend testing basics)
- REQUIRED: confident daily use of AI coding tools (Cursor/Copilot/etc.) with disciplined verification and secure practices
Nice to have
- Event-driven patterns: outbox, retries, idempotency, background jobs
- Experience with RBAC/policy engines, audit logs, fintech/compliance workflows
- Docker/Kubernetes familiarity
- CI/CD ownership (GitHub Actions/GitLab CI), release workflows
- Experience with high-security systems (custody, payments, identity)
Soft skills
- Ownership mindset: deliver features end-to-end with high quality
- Clear communication and ability to work across teams
- Pragmatic: balances long-term design with shipping
- Comfortable in ambiguity and fast iteration