Junior Fastapi Developer Jobs in Richmond, CA (NOW HIRING)

Member of Technical Staff – Full Stack / AI Systems

Company: AdsGency AI

Location: Onsite (San Francisco City)

Employment Type: Full-Time

Applicants must be permanently authorized to work in the United States without current or future employer-sponsored visa support.

We’re AdsGency AI — an AI-native startup building a multi-agent automation layer for digital advertising.

Our system uses LLM agents to autonomously launch, scale, and optimize ad campaigns across Google, Meta, TikTok, and beyond — no human marketer required.

Our mission: build the operating system where AI runs performance marketing better than humans ever could.

We’re backed by top-tier investors and moving fast. This is your chance to join early — and help shape both the architecture and culture of the company that’s reimagining the $800B ad industry.

As a Member of Technical Staff, you’ll be one of the core builders of AdsGency’s AI-driven infrastructure — designing, architecting, and scaling systems that orchestrate multi-agent ad automation across global platforms.

You’ll work shoulder-to-shoulder with founders and senior engineers on everything from real-time pipelines to LLM orchestration layers, ensuring that our stack is both fast and resilient.

You won’t just write code — you’ll define how AdsGency scales from startup → global platform.

• LLM Agent Infrastructure: Build the orchestration layer that enables multi-agent communication, memory, and decision-making for ad operations.
• Core APIs & Microservices: Design and scale APIs powering campaigns, analytics, and agent workflows (Python / FastAPI).
• Data Pipelines & Observability: Architect real-time data systems tracking campaign performance, budget optimization, and user behavior.
• Internal Dev Tools: Develop debugging, testing, and tracing tools for agent reliability and autonomy.
• Frontend & Dashboards: Contribute to React/Next.js UIs for campaign monitoring and operator collaboration.
• AI + Ad Integrations: Integrate across ad APIs (Google, Meta, TikTok) and optimize agent workflows to deliver measurable ROI.
• System Architecture: Lead design reviews, set technical direction, and mentor junior engineers.

• Backend & Infra: Python, FastAPI, PostgreSQL, Redis, Go, Kafka, Railway, AWS/GCP
• Frontend & UX: React, Next.js, TypeScript, Tailwind
• AI Layer: OpenAI, Claude, LangChain, AutoGen, CrewAI
• Data & Tools: Redis, PGVector, PostHog, Sentry, Docker

• 3+ years of experience in software engineering or systems design
• Prior work in early-stage startups or as founding engineer
• A “builder” mindset — fast, detail-oriented, and allergic to over-engineering
• Startup DNA: you debug, iterate, and ship with speed and ownership
• Deep proficiency in backend engineering (Python, FastAPI)
• Strong knowledge of distributed systems, data models, and service orchestration
• Ability to design from first principles — not just build features but shape frameworks
• Experience with scalable infra (microservices, event-driven, or serverless systems)

• Experience building or integrating AdTech / MarTech / data-heavy SaaS systems
• Experience with LLM or multi-agent frameworks (LangGraph, CrewAI, AutoGen)
• Knowledge of real-time analytics, budget optimization, or ML ops
• Strong sense of product taste and ability to translate technical depth into business impact

• Competitive salary + meaningful equity
• Core ownership in a fast-scaling AI company
• Work directly with founders and top-tier engineers
• Culture of speed, autonomy, and craftsmanship — no corporate fluff
• Build systems that redefine how the world runs advertising

AI & Software Development

Full-Time

Onsite (San Francisco City)

• 3+ years of work experience with Computer System Design
• 3+ years of work experience with Python (Programming Language)