Join Flex as a Staff Software Engineer to shape our payment integrations platform and drive impactful features in a growth-stage FinTech company.
Posted by employer 3 months ago
First seen on Joblaze 1 week ago
Last verified on the company career page 1 day ago
Skills & Technologies
Role intensity
60% hands-on coding
Requirements
- Experience
- 8+ years
Not disclosed in this posting: visa sponsorship.
Benefits
Joblaze summary
In this role, the Staff Software Engineer will focus on developing and maintaining Flex's payment integrations platform, which includes partner APIs and user experiences. Key skills include proficiency in Java and experience with AWS, REST APIs, and scalable systems, along with a strong background in FinTech. This position is ideal for a seasoned engineer with at least eight years of experience who can lead projects and collaborate effectively across teams. Flex is a growth-stage FinTech company committed to innovation and inclusivity.
Joblaze insights
- Listed 9 days ago on Joblaze — tracked directly from Flex's career page.
- Flex has 52 other open roles including Lifecycle Marketing Manager, Director, Strategic Partnerships, Sales Development Representative II.
- 2727 active AWS roles on Joblaze right now.
- 1596 active Java roles on Joblaze right now.
- 1134 active Terraform roles on Joblaze right now.
- Salary band is above the typical range for Backend roles (median ~$180,000).
- Pays more than 75% of the 1354 salaried AWS roles we track (median $170,000). See AWS salary trends
Quick facts
- Is the Staff Software Engineer, Partner Integrations role remote?
- It's hybrid — Flex expects some on-site time in Remote.
- What's the salary range?
- Flex lists $200,000–$250,000 for this role.
- How much experience is required?
- At least 8 years of relevant experience for this Staff Software Engineer, Partner Integrations role.
- Where is the role based?
- Flex is hiring for this position in Remote.
- What's the tech stack?
- Joblaze extracted these technologies from the posting: AWS, Aurora RDS, CI/CD, Datadog, DynamoDB, EKS.
- What seniority level is this role?
- Flex targets staff-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Staff Software Engineer, Partner Integrations role at Flex.
From the original posting
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?
As we continue to grow our talented team, we remain committed to radical transparency, integrity, and individual growth. We believe that your unique background and experience adds tremendous value to the organization and will empower you to take absolute ownership of business challenges and the execution of solutions.
What we need:
Flex is looking for a Staff Software Engineer to join our Partner Engineering organization and help build out our payment integrations platform & user experiences. You will help shape 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 deliver products that wow our customers and drive business 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.
What you'll do
- Design, implement, and maintain our payment integrations platform, including partner APIs, SDKs, and embedded web experiences
- Help shape and drive the technical roadmap for the Partner Engineering team
- Design and develop scalable APIs and integrations to support money movements across our banking partners via payment rails such as ACH
- Work cross-functionally with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success to deliver high-impact features
- Scale our integrations platform to support business growth while maintaining performance and reliability
- Continuously improve daily operations through automation, tooling, design evolution, and observability
- Mentor engineers and elevate team standards through best practices, code reviews, and technical guidance
What We’re Looking For:
- Minimum 8 years of experience in software engineering
- Minimum 4 years of experience with Java; proficient in Spring (core/web/boot), Gradle, JUnit, and JVM tuning
- Experience with Service-Oriented Architecture, REST APIs, message queues, and scalable distributed systems
- Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization
- Experience leading delivery of multiple high-impact products end to end, on time with a high quality bar
- Ability to work on a globally-distributed team with a high degree of ownership
- Experience aligning technical and non-technical stakeholders on scope and delivery
- Experience in FinTech and familiarity with major payment rails
- Ability to drive quality and consistency across your team without compromising velocity
Nice to Have:
- Proficient in CI/CD systems (preferably GitHub Actions) and automation
- Skilled in observability and monitoring tools such as DataDog
- Experienced with big data platforms including Snowflake
- Proficient in Infrastructure as Code (CDK, Terraform)
- Excellent written and verbal communicator with cross-functional collaboration experience
Compensation
Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks.
Life at Flex
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
- Free Flex subscription
For full-time non-U.S. employees, we offer:
- Competitive compensation + company equity
- Unlimited PTO