Weekday Ai Prompt Writer Jobs in Riverside, CA (NOW HIRING)

Job Title

Sr. AI Agent / Prompt Engineer (260000GN)

Hyundai Capital America (HCA) helps people move forward. Through Hyundai Motor Finance, Genesis Finance, and Kia Finance, we deliver innovative financing, leasing, and insurance solutions to more than 3 million customers and businesses nationwide.

We’re a company driven by growth, innovation, and people. At HCA, you’ll find opportunities to build new skills, expand your career, and make a real impact—while working in a diverse, inclusive, and values‑driven environment. We’re proud to support our communities through volunteerism, philanthropy, and engaged Employee Resource Groups.

If you’re looking for a fast‑paced, collaborative workplace where your ideas matter, join us as we lead the future of financing freedom of movement. Apply today.

#LI-OnSite (4 days a week)

The Sr. AI Agent / Prompt Engineer designs, builds, and hardens production grade AI agents that use large language models to reason, invoke tools, retrieve enterprise knowledge, and recover from errors. This role goes beyond prompt writing and owns agent behavior end to end, including prompt systems, tool orchestration, guardrails, evaluation, and reliability in real business workflows. This role will operate independently, partner closely with architecture, product, governance, and UX, and actively drive AI initiatives from prototype through production.

• Agent and Prompt Engineering
  • Design, build and deploy multi‑step prompt chains for complex reasoning, planning, tool integration, and error recovery ensuring accuracy, reliability and contextual awareness.
  • Author and maintain robust prompt libraries (system prompts, task prompts, tool prompts) with clear structure, constraints, and fallbacks.
  • Develop agent workflows using function calling, graph‑based orchestration, or similar agent frameworks.
  • Continuously iterate prompts and agent logic to improve accuracy, consistency, and grounded response.
• Tool Use and Integration
  • Integrate agents with enterprise tools, APIs, and data sources (e.g. retrieval systems, workflow engines, internal services).
  • Define safe tool use patterns, permissions, and auditing strategies in partnership with governance and security teams.
  • Partner with data and platform engineers to ensure reliable RAG and agent execution paths.
• Evaluation, Quality, and Reliability
  • Define and run offline and online evaluations for agent behavior (task success, tool success, error recovery).
  • Diagnose failure modes such as hallucinations, prompt injection, and tool misuse.
  • Partner with QA and Governance to harden agents prior to production release.
• Cross‑Functional Collaboration
  • Partner with business teams and product managers to translate business use cases into agent behaviors and integrate AI agents into production systems.
  • Ensure optimized design for interaction flows, transparency, and user trust.
  • Stay current of emerging AI research trends and recommend practical improvements to the enterprise AI stack.

• Minimum 8 years’ progressive experience including 3+ years in applied AI or backend engineering including strong proficiency with Python.
• Experience with agent frameworks (LangChain/LangGraph or similar patterns).
• Experience with AI content generation, chatbots, or automated workflows.
• Experience with multi‑agent coordination, RLHF/RLAIF, or feedback loops preferred.
• Knowledge of safety filters, jailbreak resistance, and red‑team tactics preferred.
• Automotive or financial services industries preferred.
• Bachelor’s degree in computer science, data science, engineering, or a related field.
• Proven expertise in building AI agents and orchestrating multi-model workflows.
• Deep understanding of prompt design patterns, context management and model behavior tuning.
• Track record of delivering production‑grade AI solutions that balance innovation with reliability.
• Technical background, strong analytical skills and a creative mindset to shape AI interactions and improve automated systems.
• Exceptional attention to detail and quality.
• Ability to work autonomously and in a team environment.
• Excellent verbal and written communication, including presentation skills.
• Excellent interpersonal skills to successfully collaborate with cross‑functional departments.
• Strong orientation toward results coupled with reputation for integrity, creativity and good judgment.
• Must have the ability to challenge, when appropriate, existing practices.

• Hybrid work schedule offering 4 on‑site days and 1 remote day per week
• Vehicle benefits designed around your role, including monthly allowances and purchase and lease discounts
• Flexible health coverage with medical, dental, and vision plans, including no cost and low‑cost options
• Annual employer HSA contribution to help offset healthcare expenses
• 401(k) with company match and immediate vesting so you can start building your future from day one
• 100% company paid life and disability insurance for added peace of mind
• Wellbeing programs at no cost to you, including gym benefits and health resources
• Generous parental leave to support growing families
• Paid Volunteer Time Off plus a company donation to a charity of your choice

Our Company is an equal opportunity employer committed to fostering a diverse, inclusive, and respectful workplace—because we believe diversity builds stronger teams. We comply with all applicable federal, state, and local equal employment opportunity laws and do not discriminate on the basis of race, religion or creed, color, national origin, ancestry, caste, citizenship, sex or gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity or expression, age, disability, medical condition, genetic information, marital status, family care or medical leave status, military or veteran status, political affiliation, or any other characteristic protected by law.

Information provided during the application process is requested in good faith and will be used solely in accordance with applicable employment laws.