Flex is building the AI-native private bank for business owners.
We’re re-architecting the entire financial system for entrepreneurs—from the first dollar a business earns to how that value compounds, moves, and is ultimately spent in real life. Banking, credit, payments, personal finance, and financial operations—rebuilt from the ground up as a single, intelligent system. Flex is the full financial home for ambitious owners.
Since launching publicly in September 2023, Flex has scaled from zero to nine-figure annualized revenue, with a clear path to profitability by late 2026. We move fast, ship relentlessly, and operate with extreme ownership.
Our customers are affluent business owners ($3–$200M in revenue)—the backbone of the economy and one of the most underserved segments in finance. They’re stuck with outdated banks and fragmented tools. We’re replacing all of it. The opportunity is massive: a ~$1T+ revenue market hiding in plain sight. Our ambition is to build a $100B+ company by delivering a product that is fundamentally better—not incrementally improved.
Flex has raised $100M+ in equity and $300M+ in debt.
- Mission-critical problems: We build software that directly controls how money moves at scale.
- High bar, low ego: Small teams, exceptional people, real ownership.
- Speed over comfort: We prioritize execution, quality, clarity, and results.
- Enduring impact: What we’re building will define how a generation of owners runs their businesses.
Team & Locations
We hire exceptional people who want to build hard things and see their work matter immediately. Roles are available in: San Francisco, Miami, New York, and fully remote.
Flex Fuels Ambition.
We’re a fintech issuing unsecured credit cards and DDAs. You’ll work directly with the CRO to build a fraud management function — from green‑field design to day‑to‑day performance—leveraging third‑party providers and internal analytics to stop 1st‑party, 3rd‑party, and synthetic fraud balanced appropriately with growth objectives.
✅ What You’ll Do
Program build: Design and stand up our multi‑layer fraud stack (application, account opening/funding, account takeover, transaction monitoring, disputes/chargebacks).
Vendor strategy: Select, integrate, and tune identity, device, behavioral, and transaction‑risk providers; negotiate and measure ROI.
Decisioning & analytics: Develop rules, features, and models; define thresholds to control false positives/negatives; run A/Bs and champion‑challengers.
Data & signals: Operationalize bureau, banking, PII, device/IP, email/phone, telco, velocity, and network signals into a single decisioning framework.
Program Quality & performance: Monitor precision, capture rate, approval impact, and loss basis points; calibrate and backtest.
Cross‑functional execution: Partner with Product, Engineering, Data, Ops, and Compliance (KYC/AML, FCRA/GLBA, Reg E/Reg Z).
Guide dispute strategy to minimize friendly/first‑party abuse.
⚡️What Makes You a Great Fit
Identity / synthetic detection: SentiLink, Socure, LexisNexis Risk Solutions/ThreatMetrix, Experian CrossCore, Equifax/Kount, TransUnion TruValidate, Ekata (Mastercard), IDology.
Document & biometric IDV: Onfido, Jumio, Veriff.
Device / IP / reputation: Fingerprint (FingerprintJS), iovation/TruValidate, ThreatMetrix, MaxMind, IPQS, Arkose Labs.
Banking & income data: Plaid, Finicity, Argyle, Pinwheel.
Decisioning & case management: Alloy, Unit21, Sardine, Sift, Feedzai, Featurespace, FICO Falcon, Actimize, SAS FMS (examples).
Network tools (issuer): 3‑DS 2.x, Visa/Mastercard issuer risk tools.
Experience with graph/network features, device clusters, and behavioral biometrics.
👀 What We’re Looking For (requirements)
7+ years in issuer‑side fraud for cards and/or DDA/neobank (experience on the Consumer and Commercial side is a definite plus).
Demonstrated build‑from‑scratch experience: stood up a new fraud stack or materially re‑platformed one.
Hands‑on with SQL and practical Python/R for feature/rule prototyping and performance analysis.
Depth in 1st‑party vs 3rd‑party vs synthetic patterns (e.g., bust‑out, thin‑file synths, ATO).
Proven track record balancing loss bps versus approval rate and customer friction.
Vendor evaluation and commercial ownership (pricing, SLAs, monitoring, deprecation).
Comfort working independently; can own roadmap, write PRDs/specs, and ship with engineers.
Why Join Us
Build something generational — Capture the full lifecycle of money for ambitious business owners.
Work on real money, real risk — Payments, credit, and banking at serious scale.
Solve hard problems — AI, underwriting, compliance, and global finance from first principles.
True ownership — Small teams, high trust, real accountability.
Founder-level exposure — Direct access to leadership, customers, and investors.
High bar, high taste — Move fast without cutting corners.
Elite peers — People here are builders, not tourists.
Real upside — Meaningful equity if you help build something big.
