Customer Success Engineer / Manager Company: Confidential — y Combinator-backed startup automating debt collection Location: New York, NY (in person) Compensation: $150,000 - $200,000 base + upsell commission and retention bonuses + 0.03% - 0.1% equity Employment Type: Full-time Visa Sponsorship: Not available About the Company The client is a Y Combinator-backed startup automating debt collection, a $35B US market, with generative AI agents that outperform human collectors about 2x at a fraction of the cost. Its agents handle the full arc of debt recovery, from outreach to resolution, while keeping interactions respectful and data-driven. With a small team, the client has scaled to a $3M annualized revenue run rate and is pushing toward $10M. The Role The client is hiring a founding Customer Success Engineer to own customer relationships after the implementation handoff, keeping accounts healthy and expanding and preventing churn. The forward-deployed engineers handle the launch; you take over from there, owning ongoing AI agent support, proactive account monitoring and upsell execution across a growing book of accounts. Success means smooth handoffs, strong satisfaction, 100% retention and expansion revenue. What You Will Do • Serve as primary contact for a growing book of post-implementation accounts. • Monitor usage, performance and health signals to catch churn risk early. • Resolve technical and configuration questions independently, escalating the rest with clear context. • Drive upsell and expansion by finding new use cases. • Tune AI agents through configuration and prompt-level changes to improve outcomes. • Manage smooth handoffs from the forward-deployed engineering team. What You Bring • 3+ years in technical customer success, solutions engineering or a closely adjacent role • Experience managing multiple accounts with strong written and verbal communication • A commercial mindset with a record of upsell or expansion • Comfort troubleshooting technical issues and adjusting configurations • Based in New York City and able to work in person Nice to Have • AI, SaaS or automation startup experience with hands-on customer enablement • Familiarity with AI agents, prompt engineering or workflow automation • Owning a book of accounts at an early-stage company without a playbook Before you apply: get a free recruiter-readiness score for your resume at CareerStanding — about a minute, no signup, and your resume stays in your browser.