Job Url: https://builtin.com/job/senior-software-engineer-backend/6456696

Job Description: 
Flex
Senior Software Engineer, Backend
Job Posted 14 Days Ago Reposted 14 Days Ago
Hiring Remotely in U.S.
Remote
177K-213K
Senior level
Fintech • Payments • Real Estate • Software • Financial Services
Flex splits your bills into smaller, stress-free payments throughout the month.
The Role
Responsible for implementing backend systems supporting business features. Involves designing, testing, and scaling systems for user and partner experiences.
Summary Generated by Built In
Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2025 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense. After deliberately keeping a stealth profile as we built up unprecedented investor support and an enthusiastic user base, we are looking for motivated individuals to help us keep our mission growing. Will you be a part of the team?

About the job
Flex is looking for a Software Engineer who will be responsible for implementing the various backend systems that support all business features.

In this role, you will be part of the backend engineer team, responsible for the services and integrations that power our products, such as Payment, Billing, Identity, partner integration, etc. You’ll be designing, developing, testing, and scaling systems needed to deliver great user and partner experiences.

You’ll work closely with your product, design and engineering peers to solve our users' most pressing problems around rent payment. You’ll roll out changes to our customers in an agile manner with a delivery cadence that favors small, frequent iterations. The ideal candidate will be comfortable leading scoping, design and implementation for APIs they build and can drive their production rollouts to completion with minimum oversight.

A minimum of 4 years of experience with Java is required for this position.

Minimum Qualifications
Minimum of 6 years experience in software engineering
Minimum of 4 years experience with Java
Ability to work on a globally-distributed team with a high degree of ownership
Experience working with technical and non-technical stakeholders, successfully aligning and setting expectations on scope and delivery
Ability to grow in a fast-paced and dynamic environment that will challenge you to always bring your best
Experience building robust, fault-tolerant systems with multiple external dependencies
Experience designing, building, and maintaining data pipelines
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 AWS (EKS, Aurora RDS, Elasticache, DynamoDB) and containerization tools.
Preferred Qualifications
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.
The salary compensation range for this role will be commensurate with the candidate's experience and Flex's internal leveling guidelines and benchmarks.
For working locations in NY/NJ/CA, the base salary pay range will be $197,000-$213,000
For all other states, the base salary pay range will be $177,000-$192,000
#LI-Remote

Life at Flex:

We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace.

We offer many employee benefits. For full time, U.S. based employees we offer:

Competitive pay
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
 For full time non-US employees, we offer

Competitive Pay
Company Equity
Unlimited PTO

Read Full Description
Top Skills
Aurora Rds
AWS
Cdk
Datadog
DynamoDB
Eks
Elasticache
Github Actions
Gradle
Java
Junit
Snowflake
Spring
Terraform
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 Am I A Good Fit? 
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Minimum of 6 years experience in software engineering
Minimum of 4 years experience with Java
Experience building robust, fault-tolerant systems with multiple external dependencies
Experience with Service-Oriented Architecture, REST APIs, Message Queues, and scalable architectures
Experience designing, building, and maintaining data pipelines
Proficient in Java frameworks and tools used at Flex, including Spring, Gradle, JUnit, and JVM
Experience with AWS and containerization tools
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The Company
HQ: New York, NY
304 Employees
Year Founded: 2019
What We Do
Flex is a growth-stage, NYC headquartered FinTech company that is creating the best rent payment experience. It’s hard to believe that it’s 2024 and paying rent on time is expensive, inflexible, and difficult. We’re here to change that! Flex enables our users to pay rent throughout the month on a schedule that better fits their finances and budget. Our mission is to empower as many renters as possible with flexibility over their most significant recurring expense.

Why Work With Us
We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self aware people to grow a successful company. Our HQ is based out of NYC, but we have employees located globally (US, Canada, Brazil, and Israel). We value the unique and dynamic perspectives our team brings every day.

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