Senior Fastapi Developer Jobs in Union City, CA (NOW HIRING)

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Job Category
Software Engineering
Job Details
About Salesforce
Salesforce is the #1 AI CRM, where humans with agents drive customer success together. Here, ambition meets action. Tech meets trust. And innovation isn't a buzzword - it's a way of life. The world of work as we know it is changing and we're looking for Trailblazers who are passionate about bettering business and the world through AI, driving innovation, and keeping Salesforce's core values at the heart of it all.
Ready to level-up your career at the company leading workforce transformation in the agentic era? You're in the right place! Agentforce is the future of AI, and you are the future of Salesforce.
Salesforce is looking for an AI Software Engineer to be part of the team building and scaling the Agentforce Reasoning Engine - the core Python/FastAPI service powering multi-agent orchestration in Agentforce. You will work on the infrastructure and AI systems that enable intelligent agents to reason, plan, and act on behalf of millions of customers every day.
The Team We are a group of Generative AI Application Engineers passionate about designing and building the reasoning backbone of Agentforce. We love to learn, teach, and help each other, and we seek individuals with a collaborative attitude and openness to others' ideas.
The Role You will play a critical role in building and scaling the Agentforce Reasoning Engine - a Python/FastAPI service that orchestrates multi-agent workflows and integrates with LLM backends. You will own scalable backend services that handle session state, agent coordination, and LLM call chains across thousands of concurrent tenants. You will collaborate with AI Platform Engineers and Software Engineers to define requirements, improve reliability, and ship production AI systems.
What You'll Do

• Build and own end-to-end scalable backend services powering multi-agent orchestration, supporting thousands of tenants at production scale.
• Design and improve stateful session management using Redis and distributed storage patterns.
• Drive system efficiencies through automation, including capacity planning, performance tuning, monitoring, and root cause analysis.
• Participate in periodic on-call rotations and be available to resolve critical issues.
• Collaborate with Product Managers, Application Architects, and AI researchers to bring innovative agent reasoning capabilities to production.

Required Skills

• 3+ years of industry experience building production AI systems and/or backend services.
• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related STEM field with strong competencies in algorithms, data structures, and software design.
• Strong Python programming skills; experience building production-grade async services (FastAPI or equivalent).
• Experience with distributed, scalable systems and modern data storage frameworks such as Redis, Kafka, and Docker/Kubernetes.
• Experience integrating with LLMs and prompt engineering in production systems.
• Proven ability to innovate and deliver results at scale.

Preferred Skills

• Experience with multi-agent orchestration or agentic AI frameworks.
• Familiarity with vector databases, embeddings, and retrieval systems.
• Experience with conversational AI or voice-integrated services.
• Strong written and verbal communication skills with a track record of cross-team collaboration.

Unleash Your Potential
When you join Salesforce, you'll be limitless in all areas of your life. Our benefits and resources support you to find balance and be your best, and our AI agents accelerate your impact so you can do your best. Together, we'll bring the power of Agentforce to organizations of all sizes and deliver amazing experiences that customers love. Apply today to not only shape the future - but to redefine what's possible - for yourself, for AI, and the world.
Accommodations
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Posting Statement
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In the United States, compensation offered will be determined by factors such as location, job level, job-related knowledge, skills, and experience. Certain roles may be eligible for incentive compensation, equity, and benefits. Salesforce offers a variety of benefits to help you live well including: time off programs, medical, dental, vision, mental health support, paid parental leave, life and disability insurance, 401(k), and an employee stock purchasing program. More details about company benefits can be found at the following link: to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring, Salesforce will consider for employment qualified applicants with arrest and conviction records.
At Salesforce, we believe in equitable compensation practices that reflect the dynamic nature of labor markets across various regions.The typical base salary range for this position is $148,500 - $223,900 annually. In select cities within the San Francisco and New York City metropolitan area, the base salary range for this role is $178,900 - $246,000 annually.The range represents base salary only, and does not include company bonus, incentive for sales roles, equity or benefits, as applicable.