Staff Software Engineer, Flex
Backend
$199-262k
Salary dependent on location. + Equity
Flexible rent payment application
Be an early applicant
Flexible rent payment application
501-1000 employees
Be an early applicant
$199-262k
Salary dependent on location. + Equity
501-1000 employees
Company mission
Flex's mission is to empower as many renters as possible with flexibility over their most significant recurring expense.
Role
Who you are
- 6–8+ years of professional software engineering experience, with a focus on backend development
- 4+ years of hands-on Java experience (Spring core/web/boot, Gradle, JUnit, JVM tuning & performance)
- Strong computer science fundamentals and proven experience designing scalable, distributed systems
- Experience leading the delivery of multiple high-impact projects end-to-end
- Skilled at working with both technical and non-technical stakeholders, aligning on scope and delivery
- Ability to write high-quality, testable, maintainable, and secure code
- Hands-on experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB), containerization (Docker/Kubernetes), and relational + NoSQL databases (MySQL, PostgreSQL, DynamoDB)
- Proficient with CI/CD pipelines (GitHub Actions preferred), git, and build automation
- Familiar with observability and monitoring tools (e.g., DataDog) for maintaining service availability
- Excellent communicator, comfortable collaborating in globally distributed teams
- Track record of mentoring engineers and raising team standards through best practices
- Bonus: Experience in FinTech and familiarity with major payment rails; experience with big data platforms (e.g., Snowflake); Infrastructure as Code (CDK/Terraform)
What the job involves
- Flex is hiring Staff Software Engineer, Backend roles across three engineering teams: Consumer, Partner Integrations, and Core Platform
- When you apply, you will automatically be considered for all open Staff Backend positions, and your placement will be determined based on your experience and expertise assessed during the interview process
- As a Staff Engineer at Flex, you’ll help set technical direction and shape the long-term architecture of our backend services while still being hands-on with coding and delivery
- You will collaborate across engineering, product, design, and other stakeholders to ensure scalable, reliable, and impactful systems that power consumer experiences, partner integrations, and our core business platforms
- You’ll also play a critical role in mentoring engineers, elevating technical standards, and ensuring the success of projects end-to-end
- 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
- Design, build, and scale backend services and APIs that power Flex’s consumer apps, partner integrations, and core platforms
- Provide technical leadership and guidance on system architecture, long-term vision, and team best practices
- Lead the delivery of highly impactful products end-to-end, from requirements gathering to rollout, with high quality and timeliness
- Work closely with product, design, and cross-functional teams to translate requirements into robust technical solutions
- Build robust, fault-tolerant systems with multiple external dependencies in distributed environments
- Drive adoption of best practices across the engineering org, including testing, observability, automation, and CI/CD
- Mentor and support engineers on the team, raising the technical bar and fostering growth
- Operate services in production with high availability, leveraging monitoring and observability tools
- Contribute to evolving Flex’s service-oriented architecture, REST APIs, message queues, and scalable system design
- Balance hands-on execution with architectural decision-making, ensuring velocity and long-term maintainability
Our take
Many people struggle to pay their rent every month, with a variety of bills hitting their bank accounts simultaneously. Whilst many of these people earn enough money to cover their bills, the inflexible nature of monthly bills can make the all-in-one payment a harder obstacle.
Flex provides a mobile application for the flexible payment of rent, allowing users to pay their landlords through flexible payment plans, reschedule payments when necessary, and protect their funds through Overdraft Protection. The company achieves this by partnering with estate agents and paying their resident's bills upfront, taking on the challenges that landlords would normally have due to late payments.
Flex has experienced extremely rapid growth since its founding which has caused some issues, as it struggled to keep up with the surge in new customers. Having made improvements to its product and scaled its customer service team, it is set to continue providing a service that has come to be highly valued by both tenants and landlords.
Freddie
Company Specialist at Welcome to the Jungle
Insights
10% employee growth in 12 months
Company
Funding (last 2 of 5 rounds)
Feb 2022
$160m
SERIES C
Apr 2021
$46.6m
SERIES B
Total funding: $225.1m
Company benefits
- 100% company-paid medical, dental, and vision
- 401(k) + company stock options
- Unlimited paid time off + company paid holidays
- Parental leave + IVF and adoption support
- Flex Cares Program: Non-profit company match + pet adoption coverage
- Pet Insurance
- Free Flex subscription
Company HQ
Midtown Manhattan, New York, NY
Leadership
Shragie Lichtenstein
(CEO)Experience working in venture capital investments for Point72 and TVC. Also co-founded Boundless Reality.
YeTong Shao
(CPO)Experience as Data Science Researcher. Also co-founded Boundless Reality.
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