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Flex · 17 hours ago

Senior Software Engineer, Fullstack

San Francisco Bay Area

Full-time

Hybrid

Senior Level

$197K/yr - $213K/yr

5+ years exp

Flex is a growth-stage FinTech company based in NYC that aims to revolutionize the rent payment experience. They are seeking a Senior Software Engineer, Fullstack to develop and scale their platform, focusing on creating exceptional user experiences and enhancing user onboarding through robust API and service development.

AppsBillingFinancial ServicesFinTechSoftware

H1B Sponsor Likely

Responsibilities

Focus on creating exceptional user and partner experiences that drive engagement and retention

Partner closely with product managers, designers, and data scientists, data analysts to identify and solve critical user onboarding challenges

Design, develop, test, and deploy robust APIs, services and data pipelines that enhance user onboarding and overall platform experience

Implement changes through an agile methodology, prioritizing rapid iteration and continuous improvement

Utilize data and analytics to measure the impact of your work and identify opportunities for optimization

Qualification

JavaReactTypeScriptAWSCI/CDService-Oriented ArchitectureObservability toolsSoft skills

Required

5+ years of professional software development experience

3+ years of hands-on experience with Java

3+ years of experience with React or React Native

3+ years of experience with TypeScript

Having experience building high-quality mobile and web UIs to specifications is a must to have

Proficient in Java frameworks and tools used at Flex, including Spring (core/web/boot), Gradle, JUnit, and JVM (memory/performance tuning, GC)

Experience with Service-Oriented Architecture, REST APIs, Message Queues, and scalable architectures

Experience with architectures and tools in React Native and React ecosystems (Hooks, Components, Context, Redux)

Experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools

Preferred

Have the experience to build and improve user onboarding funnel and design the comprehensive experiment to drive metric improvements

Proficient in CI/CD systems (preferably GitHub Actions), git, and automation

Skilled in observability and monitoring tools, such as DataDog, to ensure high availability

Experienced with big data platforms and tooling, including Snowflake

Proficient in Infrastructure as Code, using tools like CDK and Terraform

Skilled at elevating team standards through best practices, and mentoring junior engineers

Excellent written and verbal communicator, with experience in cross-functional collaboration

Benefits

Competitive medical, dental, and vision available from Day 1

Company equity

401(k) plan with company match (our company match kicks off at the beginning of 2026)

Unlimited paid time off + 13 company paid holidays

Parental leave

Flex Cares Program

Free Flex subscription

Competitive compensation + company equity

Unlimited PTO

Company

Flex

Glassdoor3.9

Flex enables people to pay rent bills on a schedule that fits their personal finances.

Founded in 2019

New York, New York, USA

201-500 employees

https://getflex.com

H1B Sponsorship

Flex has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)

Distribution of Different Job Fields Receiving Sponsorship

Represents job field similar to this job

Trends of Total Sponsorships

2025 (1)

2024 (1)