Senior Application Developer (Westlake Village)

PENNYMACPennymac (NYSE: PFSI) is a specialty financial services firm with a comprehensive mortgage platform and integrated business focused on the production and servicing of U.S. mortgage loans and the management of investments related to the U.S. mortgage market. At Pennymac, our people are the foundation of our success and at the heart of our dynamic work culture. Together, we work towards a unified goal of helping millions of Americans achieve aspirations of homeownership through the complete mortgage journey.A Typical DayThe OpportunityWe are seeking a Senior Application Developer to lead the development of next-generation Communication Platforms at Pennymac. This role will develop, manage and mentor a talented team of application developers building robust, scalable, and highly available systems. The ideal candidate combines technical expertise in real-time communications and open-source tools like FreeSWITCH, with proven experience delivering enterprise-grade software solutions integrated with platforms such as ZenDesk, ServiceNow, Five9, Zoom, and CallMiner.You will guide the design, development, and deployment of VOIP/SIP systems, real-time APIs, and customer engagement platforms, driving innovation while ensuring quality, reliability, and performance.What You'll Do (Responsibilities)Lead, mentor, and develop a team of engineers focused on communication technologies and full-stack development.Set technical direction and ensure adoption of best practices in architecture, security, DevOps, and software delivery.Champion a high-performance, agile development culture aligned with Pennymac’s values and technology strategy.Oversee development of complex, enterprise-transforming communication applications using modern tech stacks.Drive the integration of communication platforms (e.g., Zoom, Five9, ZenDesk, CallMiner) with internal systems.Ensure the design and stability of VOIP infrastructure, including SIP servers and FreeSWITCH deployments.Promote the use of design patterns, event-driven architecture, unit testing, and clean code principles across the team.Architect scalable, secure, and cloud-native solutions leveraging containerization (Docker/Kubernetes), CI/CD pipelines, and infrastructure-as-code (e.g., Chef, AWS CDK, Troposphere).Guide incident response and troubleshooting of high-impact production issues with composure and technical depth.Foster observability, monitoring, and performance tuning practices in VOIP and application environments.Work cross-functionally with business stakeholders, Product, QA, and IT to ensure applications deliver measurable business value.Translate business needs into clear technical goals, balancing short-term delivery with long-term maintainability.What You’ll BringWhat We're Looking For (Qualifications)Bachelor’s degree in Computer Science, Engineering, or related field.8+ years of software engineering experience, including 3+ years in technical leadership roles.Proven success leading teams building real-time communication or VOIP-based applications.Hands-on experience with backend development (Go, Python, Node.js) and front-end frameworks (React, TypeScript, JavaScript).Strong understanding of API design, microservices, and distributed systems.Experience working with:FreeSWITCH and SIP protocolsZoom, ZenDesk, Five9, CallMiner or similar communication platformsCloud infrastructure (AWS preferred)DevOps pipelines and Git-based workflowsKnowledge of:Networking protocols (SIP, RTP, TCP/IP, DTMF, QoS)NoSQL databases (MongoDB)Container orchestration (Kubernetes), DockerInfrastructure as code (Chef, AWS CDK, Troposphere)Authentication protocols (OAuth2)Familiarity with Agile and SCRUM methodologiesStrong communication and collaboration skills, with a demonstrated ability to work across teams and drive results.Nice to Haves:Experience with FreeSWITCH module development or customizationFamiliarity with packet analysis tools (e.g., Wireshark)Prior experience with SMS, contact center, or CRM integrationsLinux systems administration and scripting with Bash/PythonBackground in speech analytics, AI-driven call classification, or real-time transcriptionWhy You Should JoinAs one of the top mortgage lenders in the country, Pennymac has helped over 4 million lifetime homeowners achieve and sustain their aspirations of home. Our vision is to be the most trusted partner for home. Together, 4,000 Pennymac team members across the country are guided by our core values: to be Accountable, Reliable and Ethical in all that we do. Pennymac is committed to conducting a business that makes positive contributions and promotes long-term sustainable growth and to fostering an equitable and inclusive environment, where all employees and customers feel valued, respected and supported. Benefits That Bring It Home: Whether you're looking for flexible benefits for today, setting up short-term goals for tomorrow, or planning for long-term success and retirement, Pennymac's benefits have you covered. Some key benefits include: Comprehensive Medical, Dental, and VisionPaid Time Off Programs including vacation, holidays, illness, and parental leave Wellness Programs, Employee Recognition Programs, and onsite gyms and cafe style dining (select locations)Retirement benefits, life insurance, 401k match, and tuition reimbursement Philanthropy Programs including matching gifts, volunteer grants, charitable grants and corporate sponsorshipsTo learn more about our benefits visit: For residents with state required benefit information, additional information can be found at: Compensation: Individual salary may vary based on multiple factors including specific role, geographic location / market data, and skills and experience as defined below:Lower in range - Building skills and experience in the roleMid-range - Experience and skills align with proficiency in the role Higher in range - Experience and skills add value above typical requirements of the role Some roles may be eligible for performance-based compensation and/or stock-based incentives awarded to employees based on company and individual performance. Salary$131,500 - $294,000 Work ModelOFFICE