Senior Backend Engineer - FinTech Payments & APIs

Flex; New York (NY); On-site; USD 150,000 - 230,000; Full time

Job summary

Flex is a NYC-based FinTech company redefining rent payments by enabling flexible monthly scheduling and on-time payments. We are seeking a Senior Backend Engineer to design, build, and scale the core services behind Payment, Billing, Identity, and partner integrations that keep rent moving every month.

You will own API design and implementation, collaborate with product and design teams, and drive production rollouts with frequent, small iterations to reduce risk.

Qualifications

• 6+ years of backend engineering experience, preferably in fintech or related field.
• Proven ability to design and scale RESTful APIs and services.
• Strong collaboration with product, design, and engineering teams.

Responsibilities

• Design, build, and scale the services and integrations behind Payment, Billing, and Identity systems.
• Own API scoping, design, and implementation for the services you own.
• Lead production rollouts end-to-end with minimal oversight, iterating in small releases.

Skills

Backend development

APIs design

Distributed systems

Cloud services

Job description

Flex is a NYC-based FinTech company redefining rent payments by enabling flexible monthly scheduling and on-time payments. We are seeking a Senior Backend Engineer to design, build, and scale the core services behind Payment, Billing, Identity, and partner integrations that keep rent moving every month.

You will own API design and implementation, collaborate with product and design teams, and drive production rollouts with frequent, small iterations to reduce risk.