[Hiring] Staff Engineer Software @OneMain Financial

Role Description

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.

• 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.

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.

Requirements

• 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.

Benefits

• 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).