Christian Retana

Oatfi

• Worked on automating financial workflows that helped the company move capital faster and more reliably on a daily basis.
• Improved the development pipeline so the team could ship features quicker and with more confidence.
• Built backend services that made the loan underwriting process significantly faster for both the team and end customers.
• Brought AI-assisted tooling into the workflow, cutting the time it took to deliver new features from a full day down to a few hours.

LendOS

• Helped take the product from zero to a working MVP, building out most of the infrastructure and making sure it could scale from day one.
• Built a data processing service that made the platform run leaner and handle real-time information much more efficiently.
• Took on a large portion of the codebase — both frontend and backend — and got it to a place where the team could confidently demo to clients.

HealthIQ

• Modernized an aging backend by moving it to a more maintainable and scalable architecture without disrupting the existing product.
• Made meaningful performance improvements across the app by optimizing how data was fetched and how UI components were structured.
• Kept the system running reliably, stepping in to resolve production issues quickly and consistently as part of the on-call rotation.

Smash / ExtraSpace Storage

• Replaced a legacy notification system with a modern, lightweight microservices approach that was easier to maintain and deploy.
• Set up and managed automated workflows that handled message delivery at scale with greater reliability.

TradeStation

• Built a cashiering app that let customers wire funds into their trading accounts in real time, connecting to third-party financial services in a way that felt seamless.
• Launched a crypto waitlist experience that brought in over a thousand interested users per day ahead of the platform's trading launch.
• Redesigned the account-opening flow — simplifying a long and frustrating process that was causing people to drop off before finishing.
• Contributed to improving release processes and mentored teammates through code reviews that raised the overall quality of the codebase.

GFT Group · Blackstone

• Worked on compliance software for one of the world's largest investment firms, building systems that had to meet strict financial regulatory requirements.
• Prioritized code quality and testing throughout the engagement, producing work that could hold up under regulatory scrutiny.
• Mentored junior and mid-level engineers on the team, helping build a culture of quality and shared responsibility around compliance standards.