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Flex · 8 hours ago

Staff Software Engineer, Backend

United States

Full-time

Remote

Senior Level, Lead/Staff

$221K/yr - $262K/yr

6+ years exp

Flex is a growth-stage FinTech company headquartered in NYC, focused on creating a seamless rent payment experience. They are seeking a Staff Software Engineer, Backend to lead technical direction, mentor engineers, and collaborate across teams to build scalable and reliable backend services.

AppsBillingFinancial ServicesFinTechSoftware

H1B Sponsor Likely

Responsibilities

Design, build, and scale backend services and APIs that power Flex’s consumer apps, partner integrations, and core platforms

Provide technical leadership and guidance on system architecture, long-term vision, and team best practices

Lead the delivery of highly impactful products end-to-end, from requirements gathering to rollout, with high quality and timeliness

Work closely with product, design, and cross-functional teams to translate requirements into robust technical solutions

Build robust, fault-tolerant systems with multiple external dependencies in distributed environments

Drive adoption of best practices across the engineering org, including testing, observability, automation, and CI/CD

Mentor and support engineers on the team, raising the technical bar and fostering growth

Operate services in production with high availability, leveraging monitoring and observability tools

Contribute to evolving Flex’s service-oriented architecture, REST APIs, message queues, and scalable system design

Balance hands-on execution with architectural decision-making, ensuring velocity and long-term maintainability

Qualification

JavaBackend developmentAWSDistributed systemsCI/CD pipelinesContainerizationMentoringCommunicationCollaborationProblem-solving

Required

6–8+ years of professional software engineering experience, with a focus on backend development

4+ years of hands-on Java experience (Spring core/web/boot, Gradle, JUnit, JVM tuning & performance)

Strong computer science fundamentals and proven experience designing scalable, distributed systems

Experience leading the delivery of multiple high-impact projects end-to-end

Skilled at working with both technical and non-technical stakeholders, aligning on scope and delivery

Ability to write high-quality, testable, maintainable, and secure code

Hands-on experience with AWS (EKS, Aurora RDS, Elasticache, DynamoDB), containerization (Docker/Kubernetes), and relational + NoSQL databases (MySQL, PostgreSQL, DynamoDB)

Proficient with CI/CD pipelines (GitHub Actions preferred), git, and build automation

Familiar with observability and monitoring tools (e.g., DataDog) for maintaining service availability

Excellent communicator, comfortable collaborating in globally distributed teams

Track record of mentoring engineers and raising team standards through best practices

Preferred

Experience in FinTech and familiarity with major payment rails

Experience with big data platforms (e.g., Snowflake)

Infrastructure as Code (CDK/Terraform)

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

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Trends of Total Sponsorships

2025 (1)

2024 (1)