Software Engineer | Propr.xyz at Swissborg

Propr.xyz is building a new Operating System for prop firms, helping them leverage blockchain technology to make them more efficient. We enable prop firms to leverage perpetual futures on Hyperliquid, prediction markets, and spot assets. We are actively deploying our technologies to the largest prop firms in the world. The pace is intense, but the journey is exciting. We only hire A-players. You need to be exceptional. Responsibilities • Design and implement backend services across the trading domain. • Own features end to end: schema, API, tests, UI integration. • Contribute to real time infrastructure and client facing APIs. • Write integration tests against real dependencies. Requirements • 5+ years production backend experience. • Strong TypeScript or other strongly typed language background. • Experience with trading systems, financial infrastructure, or exchange adjacent domains. • Distributed system and transaction knowledge. • Modern Node.js backend framework (NestJS preferred; Spring / FastAPI / similar acceptable). • SQL and a production ORM (preferably TypeORM). • Arbitrary precision decimal arithmetic in financial contexts. • Integration first testing discipline. • Able to ship React / Next.js features to completion. Bonus • Event sourcing experience. • Crypto exchange experience. • Direct experience with major exchange APIs (REST + WebSocket). • AWS (ECS, Aurora, ElastiCache etc.), Terraform. • Monorepo tooling (Turborepo, Nx). • KYC / compliance workflows. • Crypto native. How to apply We ask candidates to submit their application via a POST request to our API. This helps us identify candidates who read job descriptions carefully and have basic technical skills. POST [Upgrade to PRO to see link] Request body: { "roleSlug": "software-engineer", "name": "Your Name", "email": "[Upgrade to PRO to see contact]", "link": "[Upgrade to PRO to see link]", "coverNote": "Why Propr?", "exceptionalNote": "What makes you exceptional?", "telegramHandle": "@yourhandle", "appUid": "optional-trading-terminal-uid" }