Staff Engineer Software

What the role needs

• Design, develop, and maintain Drools (KIE) rules using DRL, Decision Tables, and Rule Templates to implement complex underwriting, eligibility, and policy logic
• Optimize rule execution for low latency and high throughput , including management of rule salience, agenda groups, rule flows, and conflict resolution
• Ensure decisions are deterministic, explainable, and auditable , meeting regulatory and audit requirements
• Contribute to the overall decisioning and rules architecture , designing rule sets for reusability, versioning, and controlled rollout
• Participate in design reviews and technical discussions related to rule design and platform evolution
• Develop unit tests and scenario‑based tests to validate rule behavior across multiple decision paths
• Troubleshoot production issues related to rule execution and support deployments across development, QA, and production environments
• Act as a subject‑matter expert for Drools and business rules best practices, mentoring junior engineers
• Establish and enforce standards for rule authoring, documentation, testing, and maintainability
• 10 years of software engineering experience
• 7 years hands‑on experience with Drools / KIE
• Strong proficiency in Java and Spring / Spring Boot

From the employer

We are seeking a Staff engineer with Drools expertise to design, build, and maintain business rules for a large‑scale underwriting and decisioning platform. This role focuses on translating complex credit and risk policies into high‑performance, explainable Drools rules that power real‑time decisions. Key Responsibilities Design, develop, and maintain Drools (KIE) rules using DRL, Decision Tables, and Rule Templates to implement complex underwriting, eligibility, and policy logic Optimize rule execution for low latency and high throughput , including management of rule salience, agenda groups, rule flows, and conflict resolution Ensure decisions are deterministic, explainable, and auditable , meeting regulatory and audit requirements Contribute to the overall decisioning and rules architecture , designing rule sets for reusability, versioning, and controlled rollout Participate in design reviews and technical discussions related to rule design and platform evolution Develop unit tests and scenario‑based tests to validate rule behavior across multiple decision paths Troubleshoot production issues related to rule execution and support deployments across development, QA, and production environments Act as a subject‑matter expert for Drools and business rules best practices, mentoring junior engineers Establish and enforce standards for rule authoring, documentation, testing, and maintainability Required Qualifications 10 years of software engineering experience 7 years hands‑on experience with Drools / KIE Strong proficiency in Java and Spring / Spring Boot Experience in building a lightweight orchestration layer using Apache Pekko is a plus Deep experience with: DRL, Decision Tables, Rule Templates Stateless and stateful KIE sessions Rule performance tuning and debugging Experience building or supporting policy‑driven or decisioning systems Strong understanding of business rules management systems (BRMS) Exposure to cloud platforms and CI/CD pipelines What Success Looks Like Business policies are accurately captured as maintainable Drools rules Decisions are fast, consistent, and explainable Rule changes can be made confidently without impacting platform stability The rules layer is reliable, scalable, and regulator‑ready Who we Are OneMain Financial (NYSE: OMF) is the leader in offering nonprime customers responsible access to credit and is dedicated to improving the financial well-being of hardworking Americans. Since 1912, we’ve looked beyond credit scores to help people get the money they need today and reach their goals for tomorrow. Our growing suite of personal loans, credit cards and other products help people borrow better and work toward a brighter future. Driven collaborators and innovators, our team thrives on transformative digital thinking, customer-first energy and flexible work arrangements that grow lives, careers and our company. At every level, we’re committed to an inclusive culture, career development and impacting the communities where we live and work. Getting people to a better place has made us a better company for over a century. There’s never been a better time to shine with OneMain. Because team members at their best means OneMain at our best, we provide opportunities and benefits that make their health and careers a priority. That’s why we’ve packed our comprehensive benefits package for full- and some part-timers with: · Health and wellbeing options including medical, prescription, dental, vision, hearing, accident, hospital indemnity, and life insurances · Up to 4% matching 401(k) · Employee Stock Purchase Plan (10% share discount) · Tuition reimbursement · Paid time off (15 days’ vacation per year, plus 2 personal days, prorated based on start date) · Paid sick leave as determined by state or local ordinance, prorated based on start date · Paid holidays (7 days per year, based on start date) · Paid volunteer time (3 days per year, prorated based on start date) Target base salary range is $150,000-$170,000, which is based on various factors including skills and work experience. In addition to base salary, this role is eligible for a competitive compensation program that is based on individual and company performance OneMain Holdings, Inc. is an Equal Employment Opportunity (EEO) employer. Qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship status, color, creed, culture, disability, ethnicity, gender, gender identity or expression, genetic information or history, marital status, military status, national origin, nationality, pregnancy, race, religion, sex, sexual orientation, socioeconomic status, transgender or on any other basis protected by law.