Job Url: https://oneapp.pinpointhq.com/postings/768e2259-b6e6-4c54-9e94-1b90e89ba226 Job Description: Back-End Software Engineer About OneApp: OneApp is a mission-driven company that increases access to rental housing by removing financial and systemic barriers for renters while reducing risk for property managers. We're building market-based solutions to unlock housing opportunities at scale, with a bold 10-year goal to help 1 million people gain access to housing. Role Overview: As a Backend Software Engineer at OneApp, you will play a critical role in designing and scaling the systems that power our platform. This is a hands-on, high-impact role with meaningful ownership over backend architecture, reliability, and performance. You will work closely with product, frontend engineering, and leadership to build solutions that are secure, scalable, and aligned with OneApp’s long-term growth. Details: Job Title: Back-End Software Engineer Location: Remote Salary: $125,000-$130,000, with a variable annual bonus of up to $10,000 paid quarterly Reports to: Principle Engineer Work Hours: Full Time, Hours Monday-Friday 9:00am-5:00pm (your local time) Key Responsibilities Design, build, and maintain scalable backend services and APIs using TypeScript/Node.js and our React-based frontend Manage and optimize our MySQL databases with a focus on complex query optimization and performance tuningCollaborate with product and frontend teams to translate business needs into technical solutions Own the evolution and maintenance of our legacy Java/Spring platform while driving modernization effortsEnsure data integrity and system observability across backend services Integrate and maintain connections to third-party APIs, ensuring reliability and proper error handling Implement secure authentication and authorization using JWT, OAuth, and other modern auth patterns Lead contractor teams and coordinate distributed engineering efforts across multiple work streams  Build and maintain Docker containerized applications with strict adherence to CI/CD pipelines using GitHub Actions  Write comprehensive tests using Jest for backend services and support Selenium-based frontend testing  Conduct load testing and performance analysis to ensure systems can handle production scale  Respond to and resolve production incidents, including participating in on-call rotation as needed  Ensure data integrity, system observability, and monitoring across all backend services  Participate in code reviews and contribute to shared engineering standards and documentation  Mentor and support junior and mid-level engineers through collaboration and feedback Contribute to technical direction as OneApp continues to scale Qualifications & Criteria 5+ years of backend engineering experience in a production environment  Strong proficiency in TypeScript/Node.js for modern backend development or ability to learn quickly  Experience with Java/Spring and managing legacy systems  Deep knowledge of MySQL including complex queries, indexing, and performance optimization  Proven ability to design and implement RESTful APIs and integrate third-party services  Strong understanding of authentication and authorization (JWT, OAuth 2.0, session management)  Expertise in Docker containerization and CI/CD pipelines (GitHub Actions preferred)  Experience with testing frameworks (Jest or similar) and test automation strategies  Hands-on experience with load testing tools and methodologies (JMeter, k6, Artillery, etc.)  Track record of handling production incidents and on-call responsibilities  Solid understanding of system design, scalable architecture, and distributed systems  Experience leading or coordinating contractor teams and distributed engineering efforts  Strong communication skills with an emphasis on clarity, documentation, and cross-functional collaboration Preferred Qualifications: Experience in fintech, proptech, or other regulated environments Exposure to event-driven or service-oriented architectures Experience improving or modernizing legacy systems  Experience with AWS services (RDS, EC2, ECS, Lambda, etc.)  Familiarity with monitoring and observability tools (CloudWatch, Datadog, New Relic) Prior experience mentoring or providing technical guidance Benefits This is a full-time position Salary: $125,000-$130,000, with a variable annual bonus of up to $10,000 paid quarterly Medical, Dental and Vision Benefits  401K Plan  Unlimited PTO  About OneApp, Inc. We specialize in delivering innovative solutions and exceptional services to meet the diverse needs of our clients. With a strong commitment to quality and customer satisfaction, we strive to exceed expectations and drive success in every project we undertake.