Senior Staff Software Engineer

Who you are

• A Doer — you get things done efficiently, and you're comfortable rolling up your sleeves when something's blocking the team
• An Owner — you take full accountability for what you build, from design through production, and you always have a plan B
• Someone Collaborative — you bring people together to pressure-test ideas rather than working in a silo
• Someone with Precision — your code and your communication are both clear, because ideas only matter once others can act on them
• Someone Resilient — systems break and priorities shift, and you adapt without losing momentum
• Someone Humble — you care more about getting to the right answer than being the one who's right
• Bachelor or above degree in Computer Science or a related field
• Minimum of 10 years experience in software engineering, with at least 3 years of technical leadership experience in a hands-on capacity
• Ability to work on a globally-distributed team with a high degree of ownership
• Experience leading the delivery of multiple highly impactful products end to end, on time with a high quality bar
• Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
• Ability to drive yourself and your team to bring quality and consistency to their code and architecture, without compromising velocity
• Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
• Experience in designing and developing solutions that maximize ROI and lead to significant business impact
• Experience working in FinTech and familiar with major payment rails
• Experience working with Sales stakeholders and/or building products for Sales professionals
• Experience building integrations with external partners & managing relationships with external stakeholders
• Experience working on AWS cloud based applications

What the job involves

• Flex exists to make paying rent work the way real life actually works — smoothing out cash flow, helping renters avoid late fees, and letting them build credit instead of falling behind
• As a Senior Staff Software Engineer, you'll oversee the technical roadmap for the team, working across APIs, SDKs, and Web experiences
• You will work with teams across the organization including Engineering, Product, Design, Infrastructure, Sales, Partner and Customer Success to ensure that the technical strategy meets our goals
• We expect you to be hands-on and execute work as an individual, and build products that allow for flexibility as we evolve our product offerings
• We have some really exciting teams who are looking for an amazing engineer like you! Check them out!
• Partner Integrations - Partner integrations work to standardize APIs, tools, and processes that let external partners connect to Flex for data sharing and payments across entry points like Flex Anywhere

Benefits

• Medical, Dental & Vision: Your healthcare will be available from Day 1— giving you immediate peace of mind — with best in class coverage and options.
• Parental Leave: Step away with paid time off to focus on family and life’s newest chapter.
• NYC HQ: Collaborate in our lively New York headquarters, with new office space on the way!
• 401(k) Retirement Savings: Plan ahead with our 401(k) program to grow your future. And starting early 2026, employees will be eligible for a company match!
• Flex Giving: ‍Flex Giving empowers employees to support local nonprofits advancing housing stability in the communities we call home.
• Employee Assistance Fund: ‍Confidential financial support to teammates facing unexpected hardships or emergencies.
• Hybrid Work Policy: Work flexibly from home, with in-person collaboration and events that matter.
• Unlimited PTO + Holidays: Take the time you need— whether that’s a vacation, recharge, or simply a long weekend
• Free Flex Subscription: As a Flex employee, you'll have full access to our services without charge.
• GrubHub Credit: Enjoy meal credits while in the office, so you’re fueled for the workday ahead.