Senior Software Engineer, Fullstack – Risk Engineering

Flex

Senior Software Engineer developing risk management solutions using Java and AWS at fintech company. Collaborating with teams to launch features and build decision platforms.

Posted 4/28/2026full-timeNew York City • California, New York • 🇺🇸 United StatesSenior💰 $172,000 - $210,000 per yearWebsite

Tech Stack

Tools & technologies

AWSDistributed SystemsDynamoDBGradleJavaJUnitReactReact NativeReduxSpringSpring BootSpringBootTypeScript

About the role

Key responsibilities & impact

Build decision platform / machine learning solutions to respond to/mitigate business risks in Flex.
Design and develop 24/7 high-scale APIs and distributed systems. The tech stack will be on AWS. Java would be the language for the existing code base. Java Spring Boot will be the framework.
Work closely with product, design, and engineering peers to launch new features across our web and mobile platforms

Requirements

What you’ll need

Must-have: Experience working in a risk engineering team, specializing in rules engine architecture or risk/credit/fraud systems.
6+ years of professional software development experience.
5+ years of hands-on experience with Java.
2+ years of experience with React or React Native.
2+ years of experience with TypeScript.
Having experience building high-quality mobile and web UIs to specifications is a must to have.
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 architectures and tools in React Native and React ecosystems (Hooks, Components, Context, Redux).
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
Flex Cares Program: Non-profit company match + pet adoption coverage
Free Flex subscription

ATS Keywords

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Hard Skills & Tools

JavaJava Spring BootReactReact NativeTypeScriptService-Oriented ArchitectureREST APIsMessage QueuesJVMGradle