A system design interview walkthrough: preserve who said what across storage, search, and analysis, and keep reported numbers explainable after models change.
Engineer, founder, and backyard mechanic.
I'm Rareș. For the past decade, I've built software and systems across electric vehicles, payments and risk, blood diagnostics, healthcare operations, and AI. Most recently, I co-founded Contour, a health-tech company acquired by Commure. I studied mechatronics at Waterloo.
These days I'm in New York building developer tools and personal software, and working on a hacker space in Chinatown.
The plan was to maximize what agents could do while I slept. By five in the morning the sleep had gone out the window and the sun was coming in through it. A persistent VM, a terminal multiplexer, and a phone client fixed the schedule.
The runway spreadsheet prices every hire in months of burn and books the missing team at zero: a Contour retrospective on where staying lean paid, what contractors can't replace, and which number turns out wrong.
If the Mac still receives iMessages and the iPhone sends normally, restart imagent and identityservicesd before signing out or resetting the account.
Work
- Company
- Contour
- Role
- Co-Founder & CTO
- Date
- Description
- Co-founded Contour and led engineering across telemedicine, patient billing, and senior-care search, up to the company’s acquisition by Commure.
- Company
- Assort Health
- Role
- Founding Engineer
- Date
- Description
- Built backend core and Epic EHR integrations for an AI healthcare platform.
- Company
- Athelas
- Role
- Sr. Software Engineer
- Date
- Description
- Led development of the first FDA-cleared at-home CBC, plus RPM tools and billing/reconciliation.
- Company
- Uber
- Role
- Software Engineer II
- Date
- Description
- Built real-time fraud detection and payment systems processing millions of transactions daily.
- Company
- Level Home
- Role
- Firmware Engineer
- Date
- Description
- Achieved 1+ year battery life for smart deadbolt through ultra-low power optimization.
- Company
- Tesla
- Role
- Systems Integration
- Date
- Description
- Developed firmware for Model 3 security systems. Built testing infrastructure for production ramp.
Education
- Company
- University of Waterloo
- Role
- Mechatronics Engineering
- Date