Senior Software Engineer, Backend, FinPlatform

Flex

Senior Software Engineer implementing backend systems at Flex, a FinTech company enhancing rent payment experiences. Collaborating closely with product and design teams to deliver user-focused solutions.

Posted 7/17/2026full-timeNew York City • New York • 🇺🇸 United StatesSenior💰 $172,000 - $215,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in backend system implementation, focusing on Java development, API design, and building robust, scalable architectures. Proficient in collaborating with cross-functional teams to deliver high-quality user experiences in a fast-paced environment.

Highest-signal resume keywords

Java DevelopmentAPI Design and ImplementationAWS Services (EKS, Aurora RDS, Elasticache, DynamoDB)Service-Oriented ArchitectureFault-Tolerant Systems

ATS Keywords

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Hard Skills

JavaSpring FrameworkGradleJUnitData Pipeline DevelopmentREST APIsMessage QueuesScalable ArchitecturesMemory/Performance TuningContainerization Tools

Soft Skills

CollaborationStakeholder ManagementAdaptabilityOwnership

Industry Keywords

Backend SystemsAgile MethodologyIntegration ServicesUser ExperiencePartner Integration

Tech Stack

Tools & technologies

AWSDynamoDBGradleJavaJUnitSpring

About the role

Key responsibilities & impact

Responsible for implementing the various backend systems that support all business features.
Part of the backend engineer team, responsible for the services and integrations that power products like Payment, Billing, Identity, partner integration, etc.
Designing, developing, testing, and scaling systems needed to deliver great user and partner experiences.
Work closely with product, design, and engineering peers to solve users' most pressing problems around rent payment.
Roll out changes to customers in an agile manner with a delivery cadence that favors small, frequent iterations.
Comfortable leading scoping, design, and implementation for APIs built and can drive production rollouts to completion with minimum oversight.

Requirements

What you’ll need

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.

Benefits

Comp & perks

Competitive medical, dental, and vision
Company equity
401(k) plan with company match
Unlimited paid time off + 13 company paid holidays
Parental leave
Free Flex subscription