Five9 · 6 hours ago
Senior Staff Engineer, AI Agents
United States
Full-time
Remote
Senior Level, Lead/Staff
$114K/yr - $317K/yr
10+ years expFive9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. The Senior Staff Engineer, AI Agents, will be responsible for the software architecture and development of Five9’s AI Agent software platform, mentoring junior engineers and collaborating across teams to deliver scalable and reliable solutions.
Call CenterCustomer ServiceEnterprise SoftwareSaaSSales
Responsibilities
Responsible for the software architecture and software development of Five9’s AI Agent software platform
Mentor junior engineers and set technology direction for platform
Collaborate cross-functionally to ensure complete solutions are delivered
Make important technology decisions and drive platform evolution
Ensure the software platform is scalable, reliable, observable and maintainable
Qualification
Required
1+ years of experience in software development for GenAI platforms for Customer Support/Customer Experience is REQUIRED
5+ years of software development experience in Java
5+ years of experience in enterprise SaaS software development
10+ years of software development experience
Bachelor's or advanced degree in computer science, computer engineering or similar
Expert-level proficiency in Java and JVM-based frameworks
Strong understanding of object-oriented design, design patterns, clean code, refactoring, and code quality best practices
Deep experience designing and building distributed, event-driven systems with high reliability and low latency
Expertise in API design (REST/gRPC), service contracts, and backward-compatible evolution
1+ years of experience in AI Agent / GenAI Platform Engineering
Strong familiarity with LLMs, prompt orchestration, function calling, and multi-agent reasoning workflows
Experience building AI-enabled microservices, including integrating LLM providers, embeddings, vector databases, RAG pipelines, and structured output validation
Solid understanding of model latency, throughput, caching strategies, eval frameworks, and ML-specific observability
Experience using one or more frontier models from OpenAI, Google, or open source
5+ years experience in building enterprise SaaS software
Expertise with public cloud software development platforms, AWS, GCP or Azure
Strong familiarity with networking fundamentals: HTTP/2/3, gRPC, load balancing, API gateways, service meshes
Strong command of SRE principles: SLIs/SLOs, error budgets, incident response, root cause analysis
On-call experience, including incident handling, troubleshooting, and service remediation
Experience designing systems for observability: tracing, logging, metrics, profiling
Knowledge of performance optimization—CPU, memory, threading, concurrency, GC tuning
Hands-on experience running 24×7 global enterprise SaaS systems in production
Familiarity with authentication/authorization technologies (OAuth2/OIDC, JWT, mTLS)
Understanding of secure coding practices, data protection, and enterprise SaaS compliance needs (SOC2, GDPR, HIPAA)
Ability to drive end-to-end architecture for complex platforms, from requirements → design → implementation → deployment
Skilled at creating architecture docs, ADRs, technical deep-dives, and communicating trade-offs clearly
Strong understanding of eventing, CQRS, streaming, pub/sub, state machines, and distributed consensus patterns
Experience in using AI to accelerate software development, using tools like Claude Code or Microsoft CoPilot
Ability to mentor and elevate teams—code reviews, design guidance, pairing, coaching junior engineers
Strong communication skills; capable of explaining technical decisions to Engineering leadership, Product & UX, Support, SRE, QA, and Solutions Engineering
Demonstrated ability to collaborate across orgs to deliver complete, integrated product experiences
Ability to set technical direction for the platform and influence roadmaps
Ownership mentality across the entire SDLC—design → implementation → CI/CD → monitoring → production operations
Exceptional judgment in balancing innovation vs reliability, short-term velocity vs long-term maintainability
Ability to decompose large initiatives into deliverable components, driving execution with high accountability
Preferred
Nice to Have: Spring Boot
Benefits
Health, dental, and vision coverage, beginning on the first day of employment.
Five9 covers 100% of the employee portion of the health, dental and vision coverage and shares a high portion of the dependent cost.
Short & Long-Term Disability
Basic Life Insurance
401k saving plan with employer matching
Access to an innovative mental health support platform that offers personalized care and resources in areas such as: therapy, coaching and self-guided mindfulness exercises for all covered employees and their covered dependents
Generous employee stock purchase plan
Paid Time Off
Company paid holidays
Paid volunteer hours
12 weeks paid parental leave
Company
Five9
Five9 is a cloud-based call center software company that specializes in sales, marketing, and customer service. It is a sub-organization of Five Rivers Solutions.
1001-5000 employees
H1B Sponsorship
Five9 has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (13)
2024 (15)
2023 (13)
2022 (20)
2021 (15)
2020 (15)
Funding
Current Stage
Public CompanyTotal Funding
$861.6MKey Investors
Oaktree Specialty LendingSapphire VenturesAdams Street Partners
2024-02-28Post Ipo Debt· $747.5M
2014-04-04IPO
2014-03-10Debt Financing· $30M
Leadership Team
Jonathan Rosenberg
CTO and Head of AI
Jim Alexander
VP, PMO and Quality Engineering
Recent News
2026-01-13
2026-01-13
Company data provided by crunchbase