Apply on Employer Site

Flex · 1 day ago

Senior Staff Software Engineer, Mobile & Web

San Francisco Bay Area

Full-time

Hybrid

Senior Level, Lead/Staff

$247K/yr - $266K/yr

7+ years exp

Flex is a growth-stage FinTech company headquartered in NYC, focused on creating the best rent payment experience. They are seeking a Senior Staff Mobile & Web Developer responsible for defining technical roadmaps and leading the implementation of high-priority initiatives to enhance their platforms.

AppsBillingFinancial ServicesFinTechSoftware

H1B Sponsor Likely

Responsibilities

You'll lead high priority, cross-functional, and cross-division projects that drive significant impact on the company's direction and growth

You'll advocate for and influence the implementation of architectural best practices that allow our frontend applications to scale for our growing number of users, use cases, and developers contributing to the code base

You’ll work closely with your product, design, and engineering peers to solve our users' most pressing problems

You’ll work directly with engineering leadership to align our technical and product roadmaps, and proactively work with domain owners to help them understand new technical capabilities to build the right roadmap for the business

You’ll be hands-on, make high-impact contributions and roll out changes to our customers in an agile manner with a delivery cadence that favors small, frequent iterations

You'll provide guidance on the long-term vision and architecture of our application stack, ensuring best practices and consistency across the team

You’ll lead by example, mentoring others, and fostering a high-performance culture by improving the level of craftsmanship within the teams you lead. You are responsible for designing and delivering large, complex features/systems that are leveraged across domains

The ideal candidate will be comfortable leading scoping, design, and implementation for product features they build, and can drive their production rollouts to completion with minimum oversight

Qualification

React.js/React NativeTypeScriptREST API designDistributed services architectureCloud environmentsCI/CD pipelinesMentoring engineersAgile methodologyCommunication skillsCross-functional teamwork

Required

Strong computer science fundamentals

Proficiency in React.js/React Native (7+ years) and associated tools (Hooks, Context, Redux)

Expertise in designing and delivering large, complex mobile and web UIs that are leveraged across multiple domains

Strong TypeScript development skills, with a focus on maintainability and documentation

Familiar with iOS/Android/web development tool ecosystems (Bonus: Native iOS/Android experience)

Strong understanding of REST API design and mobile API best practices

Experience working with distributed services architecture, observability, and monitoring tools (e.g., DataDog)

Proven ability to mentor engineers and promote software development best practices, actively improving the level of craftsmanship within the teams you lead

Strong communication skills and experience working with distributed teams

Experience partnering with peers and strategizing with senior leaders across multiple functions within and outside of the company

A high standard for code quality, processes, and standards

Experience working on cross-functional teams involving product, design, and engineering

Proficient in TypeScript (React.js/React Native) and familiar with Java/Springboot services architecture

Familiar with CI/CD pipelines to improve code stability and quality

Experience with cloud and containerized environments (Bonus: AWS, Kubernetes, MySQL)

Comfortable working with IDEs such as VSCode, IntelliJ, XCode, and Android Studio

Motivated to drive team effectiveness and engineering excellence

Ability to apply domain knowledge to solve complex problems with elegant technical solutions that are well integrated with the existing environment

Knowledge and understanding of broader software engineering issues to improve your team's software design

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)