Staff Software Engineer (Elixir)
River
River is a client-first Bitcoin-only financial institution building the financial app people use every day to save in bitcoin and spend in dollars. The role is a Staff Software Engineer working on an Elixir monolith, payments, custody, ML/AI systems, and a React/React Native consumer app.
What you’ll do
- Build real-time Bitcoin and USD payments, trading, and settlement on an Elixir monolith with a unified GraphQL API
- Develop next-generation Bitcoin custody with quorum signing, key ceremonies, and geo-redundant infrastructure
- Scale ML/AI systems (Python, PyTorch, XGBoost, LLMs) to automate operations and tackle fraud/risk
- Rewrite consumer app using React and React Native
- Port Lightning Network infrastructure from Go into Elixir
Skills
- Elixir: Elixir, monolith, porting Lightning infrastructure into Elixir
- GraphQL: unified GraphQL API
- Bitcoin: Bitcoin, custody, 33,000 BTC, cryptographic proof of reserves, Lightning Network, quorum signing, key ceremonies, geo-redundant infrastructure
- Python: Python, ML/AI systems
- PyTorch: PyTorch
- XGBoost: XGBoost
- LLMs: LLMs
- React: React, ground-up rewrite of consumer app
- React Native: React Native, consumer app
- Go: Go, porting from Go into Elixir
The post
River | Staff Engineers (Elixir) | NYC or REMOTE (US, Europe, South America) | Full-Time | $200K-$250K + equity | https://jobs.ashbyhq.com/river?utm_source=Zp9nJyqvd4
I'm Alex, founder and CEO of River. I also wrote the first line of code and still ship PRs.
River is a client-first Bitcoin-only financial institution building the financial app people use every day to save in bitcoin and spend in dollars. We custody over 33,000 BTC, serve individuals and businesses across the U.S., and are profitable. We publish cryptographic proof of reserves monthly and our company financials annually.
Here's what our engineering team is working on:
- Real-time Bitcoin and USD payments, trading, and settlement on an Elixir monolith with a unified GraphQL API - Next-generation Bitcoin custody with quorum signing, key ceremonies, and geo-redundant infrastructure - Scaling our ML/AI systems (Python, PyTorch, XGBoost, LLMs) to automate operations and tackle fraud/risk - A ground-up React and React Native rewrite of our consumer app - Porting our Lightning Network infrastructure from Go into Elixir We're hiring: - Staff Software Engineer (Elixir) | $200K-$250K Apply at https://jobs.ashbyhq.com/river/610f652b-bdb9-4d82-9973-680babe16a07