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Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?
Overview
Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2026 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?
About The Role
We are hiring a Senior Engineering Manager to lead the Payments platform team, responsible for the systems that charge customers, collect funds, and handle refunds.
This team owns the end-to-end payment lifecycle: authorization, charge, refund, reconciliation, and financial integrity across multiple payment rails and processors.
You will lead a team of backend engineers responsible for building a highly reliable, compliant, and cost-efficient payments platform that supports rapid product expansion while safeguarding customer funds.
This role requires hands-on leadership, you will drive architecture, execution, operational excellence, and team growth while partnering closely with Product, Risk, Finance, Compliance, and external financial partners.
Our Engineering Teams
- Consumer Engineering: Builds the APIs and backend systems powering Flex’s consumer-facing mobile and web apps. This team focuses on delivering scalable services for a seamless rent payment experience.
- Partner Integrations Engineering: Owns the backend services and integrations that connect Flex to financial partners and payment networks, ensuring secure, reliable payment flows and partner-facing experiences.
- Core Platform Engineering: Maintains the backend services and infrastructure supporting all business features, including Payments, Ledger, Identity, and Settlement, providing the foundation for all of Flex’s products.
What You’ll Do
Technical Leadership
- Define and execute the long-term architecture of Flex’s multi-rail payments platform (Card, ACH, RTP, OCT, FedNow, etc)
- Ensure financial correctness across ledgering, settlement, reconciliation, and refunds
- Drive reliability and resilience for mission-critical money movement systems
- Guide design reviews and make high-impact technical decisions
Execution & Delivery
- Lead cross-team initiatives spanning product, risk, and finance workflows
- Own delivery of large, ambiguous projects from concept to production
- Improve system scalability, observability, and incident response practices
- Reduce payment processing costs through routing strategy and platform optimization
People Leadership
- Manage, mentor, and grow a team of backend engineers
- Establish strong ownership culture and operational excellence
- Hire and develop senior engineers and future technical leaders
- Elevate engineering quality, testing discipline, and design rigor
Operational Ownership
- Ensure high availability and financial accuracy SLAs
- Lead incident response for payment-related issues
- Build guardrails to prevent financial and compliance risk
- Partner with Risk & Compliance teams on regulated workflows
Who You Are
- 8+ years of backend engineering experience and 3+ years managing engineers
- Experience building or operating payments, fintech, banking system
- Strong understanding of distributed systems reliability and data integrity
- Experience owning production services with strict uptime and correctness requirements
Track record delivering large cross-functional initiatives
Preferred
- Experience with payment rails (ACH, card networks, RTP, wires, payouts)
- Experience integrating payment processors (Stripe, Checkout, Adyen, bank APIs, etc.)
- Experience in regulated environments (KYC, NACHA, chargebacks, reconciliation)
- Familiarity with financial ledger or accounting correctness principles
- Background scaling high-growth consumer or fintech platforms
- Tier A: (NYC/SF): $240,000 —$300,000 USD
- Tier B: $216,000—$270,000 USD
- Tier C: $204,000 —$255,000 USD
#LI-Remote
We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace.
Offices
Roles posted in New York, San Francisco, and Salt Lake City are hybrid positions with on-site expectations of 2-3 days per week in our local offices. For candidates outside of these areas, you may be eligible for our relocation assistance program.
Benefits
For full-time U.S. employees we offer:
- Competitive medical, dental, and vision
- Company equity
- 401(k) plan with company match
- Unlimited paid time off + 13 company paid holidays
- Parental leave
- Flex Cares Program: Non-profit company match + pet adoption coverage
- Free Flex subscription
For full-time non-U.S. employees, we offer:
- Competitive compensation + company equity
- Unlimited PTO
Flex New York, New York, USA Office
NYC employees are invited to visit the WeWork located in the heart of Manhattan, near Union Square, however, more than 2/3rds of our employee base is fully remote. Flex is dedicated to building an equitable, remote-first culture!
What you need to know about the NYC Tech Scene
Key Facts About NYC Tech
- Number of Tech Workers: 549,200; 6% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Capgemini, Bloomberg, IBM, Spotify
- Key Industries: Artificial intelligence, Fintech
- Funding Landscape: $25.5 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Greycroft, Thrive Capital, Union Square Ventures, FirstMark Capital, Tiger Global Management, Tribeca Venture Partners, Insight Partners, Two Sigma Ventures
- Research Centers and Universities: Columbia University, New York University, Fordham University, CUNY, AI Now Institute, Flatiron Institute, C.N. Yang Institute for Theoretical Physics, NASA Space Radiation Laboratory
