Staff Engineers (Elixir) at River
Core
Building a Bitcoin-only financial institution's core platform for real-time payments, trading, settlement, and next-generation custody infrastructure.
Role type
Staff Software Engineer (Elixir)
Builds
Real-time Bitcoin/USD payments, trading, settlement, custody systems, and Lightning Network infrastructure
Domain
Fintech / Cryptocurrency / Bitcoin
Deliverable
production ML models | product features
Required skills
Elixir, GraphQL, React, React Native, Go, Python, PyTorch, XGBoost, LLMs, distributed systems, cryptography, quorum signing, geo-redundant infrastructure
Preferred skills
Experience with Bitcoin protocols, Lightning Network, ML/AI systems for fraud/risk
Technologies
Elixir, GraphQL, React, React Native, Go, Python, PyTorch, XGBoost, LLMs
Responsibilities
Design and implement real-time payment and trading systems on an Elixir monolith; develop next-gen Bitcoin custody with quorum signing; scale ML/AI systems for operations and fraud detection; rewrite consumer apps in React/React Native; port Lightning Network infrastructure from Go to Elixir
Seniority
Staff, hands-on IC