Staff Software Engineer

Summary

Join Flex, a NYC-based FinTech company, as a Staff Software Engineer to develop and enhance user experiences across mobile and web platforms. You will collaborate with a team to launch new features, design, test, and scale new product offerings, and define solutions. Work closely with cross-functional partners, including designers, product managers, and quality engineers, in an agile environment. Lead scoping, design, and implementation of product features, and mentor other engineers. Flex offers a competitive salary and benefits package.

Requirements

• Strong computer science fundamentals
• API Development (Required) Proficiency in Java (5+ years) and Spring Framework (Core/Web/Boot)
• Experience building and maintaining high-quality APIs at scale
• Strong understanding of REST API design and mobile API best practices
• Experience with distributed services architecture, observability, and monitoring tools (e.g., DataDog)
• Ability to write maintainable, testable code with best practices in unit testing, linting, and automation
• Collaboration & Mentorship Proven ability to mentor engineers and promote software development best practices
• Strong communication skills and experience working with distributed teams
• Experience working on cross-functional teams involving product, design, and engineering
• Proficient in Java (Spring Boot), TypeScript (React.js/React Native)
• Familiar with CI/CD pipelines to improve code stability and quality
• Comfortable working with IDEs such as VSCode, IntelliJ, XCode, and Android Studio
• Motivated to drive team effectiveness and engineering excellence

Responsibilities

• Develop and enhance end-user experiences across our mobile and web platforms
• Work closely with your team to launch new features
• Develop, design, test, and scale new product offerings that solve complex problems in a simple way for all of our users
• Play a key role in defining solutions, breaking down scope into actionable plans and leading your cross-functional team through implementation
• Work closely with other cross functional partners across our organization on a daily basis
• Work in an agile manner with designers, product managers, and quality engineers
• Be hands-on and execute on work as both an individual, while also building products that allow for flexibility as we are evolving our product offerings
• Work closely with your product, design and engineering peers to solve our users' most pressing problems around rent payment
• Provide guidance on the long-term vision and architecture of our application stack, ensuring best practices and consistency across the team
• Roll out changes to our customers in an agile manner with a delivery cadence that favors small, frequent iterations
• Lead by example making high impact contributions, mentoring others and fostering a high performance culture
• Lead scoping, design and implementation for product features and drive their production rollouts to completion with minimum oversight

Preferred Qualifications

• Mobile & Web Development (Nice to have) Proficiency in React.js/React Native (7+ years) and associated tools (Hooks, Context, Redux)
• Experience building high-quality, scalable mobile and web UIs
• Strong TypeScript development skills, with a focus on maintainability and documentation
• Familiar with iOS/Android/web development tool ecosystems (Bonus: Native iOS/Android experience)
• Experience with cloud and containerized environments (Bonus: AWS, Kubernetes, MySQL)

Benefits

• 100% company-paid medical, dental, and vision
• 401(k) + company equity
• Unlimited paid time off + 13 company paid holidays
• Parental leave
• Flex Cares Program: Non-profit company match + pet adoption coverage
• Free Flex subscription
• Competitive Pay
• Company Equity
• Unlimited PTO