Senior Full-Stack Software Engineer

About this role

Senior Full-Stack Software Engineer 

Location: Austin, TX (hybrid, three days a week in office)    Employment type: Full-time   |   
Company: Black Unicorn US, Inc. 

About Black Unicorn 
Black Unicorn is a technology-driven family office headquartered in the Cayman Islands, with its engineering hub in Austin. We pair private capital with in-house product and engineering teams to launch platforms in payments, financial infrastructure, e-commerce, and media. We invest and operate across several countries and industries, and we move with conviction to create enduring, high-growth companies. 

The role 
We're looking for a Senior Full-Stack Software Engineer to build  secure, high-scale financial products end to end, from backend services to the web and mobile apps customers use daily. You'll be one of the founding engineers on our Austin team, helping choose the architecture and set the engineering standards. You’ll draw on experience across multiple domains with deep roots in payments and financial systems. We want someone who ships faster using AI-assisted development and is rigorous about reviewing their output.

This role is based in Austin, TX, and requires three days a week in our downtown office. 

What you'll do

- Design, build, and maintain Java microservices for payment processing, ACH flows, and banking integrations. 
Build technical systems for the general ledger, reconciliation, and financial reporting.
- Implement KYC/AML onboarding and identity-verification workflows that meet compliance and audit requirements.
- Build secure, responsive web applications in React and TypeScript.
- Develop and ship mobile apps for iOS and Android, and own their releases.
- Deploy and run services on Azure with strong reliability, security, and observability.
- Integrate with the enterprise data lake by publishing to it and consuming from it.
- Use AI coding tools such as Claude for development, code review, testing, and documentation, and help set the team's ...