Staff Software Engineer

Position Overview

Flex is a growth-stage, NYC-headquartered FinTech company dedicated to creating the best rent payment experience. We are transforming the way renters manage their payments, enabling them to pay rent throughout the month on a schedule that aligns with their financial needs. Our mission is to empower renters with flexibility over their most significant recurring expense. We are seeking motivated individuals to join our growing team.

About the Role

Flex is looking for a Staff Software Engineer to develop and enhance end-user experiences across our mobile and web platforms. In this role, you will collaborate closely with your team to launch new features, developing, designing, testing, and scaling new product offerings that solve complex problems simply. As a Staff Engineer, you will play a key role in defining solutions, breaking down scope into actionable plans, and leading your cross-functional team through implementation. You will work daily with partners across the organization, including designers, product managers, and quality engineers, in an agile environment. We expect you to be hands-on, executing as an individual contributor while also building products that support evolving product offerings.

Responsibilities

• Collaborate closely with product, design, and engineering peers to solve users' most pressing rent payment problems.
• 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 customers in an agile manner, favoring small, frequent iterations.
• Lead by example by 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 minimal oversight.

Key Qualifications

Required Skills:

• Strong Computer Science Fundamentals
• API Development
  • 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.

Nice to Have Skills:

• Mobile & Web Development
  • 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).
• Collaboration & Mentorship
  • Proven ability to mentor engineers and promote software development best practices.
  • Strong communication skills and experience working with distributed teams.

Core Competencies:

• 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.
• Experience with cloud and containerized environments (Bonus: AWS, Kubernetes, MySQL).
• Comfortable working in a fast-paced, agile environment.

Company Information

Flex is a growth-stage, NYC headquartered FinTech company creating the best rent payment experience. We are changing the way renters pay rent by offering flexibility and ease. Our mission is to empower renters with control over their finances.

Employment Type:

• [Employment Type Not Specified]

Location Type:

• [Location Type Not Specified]

Salary:

• [Salary Not Specified]