Lead Python Backend Developer with React and LLM | KK Software Associates | San Francisco, CA

KK Software Associates; San Francisco (CA); On-site; USD 210,000 - 290,000; Full time

Job summary

KK Software Associates seeks a Lead Python Backend Developer with React and LLM capabilities to drive the architecture of enterprise-grade backend services in San Francisco. You will own backend APIs in Python, frontend interfaces in React/TypeScript, and real-time data streaming, collaborating with data architects and product leads.

The role emphasizes hands-on design, modern AI tooling, and mentoring teams, with on-site work in San Francisco and immediate interview slots available today.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, IT, or related field.
• 12+ years of software engineering experience with 7+ years in deep engineering and system design.
• Expertise in Python (Flask/FastAPI) and Node.js for backend, plus React + TypeScript for frontend.

Responsibilities

• Lead end-to-end design, development, and scaling of backend services and React frontends.
• Architect high-throughput service layers and scalable databases.
• Implement real-time data streaming via WebSockets and gRPC-web.
• Mentor junior engineers and enforce software engineering best practices.

Skills

Python (Flask/FastAPI)

Node.js

React + TypeScript

LLM orchestration

System design

Real-time protocols

Redis caching

Code reviews/mentoring

Education

Bachelor’s or Master’s in CS/SE/IT

Tools

LangChain

LlamaIndex

Smolagents

DSPy

Cursor editor

Docker

Job description

Position Summary

KK Software Associates is seeking an experienced, highly technical, and accomplished Lead Python Backend Developer with React and LLM capabilities (12+ years total experience, with 7+ years of core engineering experience) to join our client team on an urgent backfill, onsite basis in San Francisco, CA, featuring immediate interview slots today. In this specialized full-stack and AI-augmented leadership role, you will spearhead designing scalable enterprise-grade backend services in Python, building production-grade frontend interfaces in React and TypeScript, and orchestrating advanced LLM frameworks. You will work closely with engineering squads, data architects, and product leads to deliver high-performance, real-time distributed applications. Ideal candidates bring a robust academic background in computer science, deep practical mastery of Python (Flask/FastAPI), Node.js, React, and LLM orchestration tools, and immediate availability for deployment in San Francisco.

Detailed Job Description

As a Lead Python Backend Developer with React and LLM at KK Software Associates in San Francisco, CA, you will take full ownership of architecting performant backend service layers, designing high-throughput databases, and delivering responsive full-stack applications. Your day-to-day responsibilities encompass engineering high-throughput backend APIs using Python (Flask/FastAPI) and Node.js, building robust user interfaces with React and TypeScript, and implementing real-time data streaming via WebSockets and gRPC-web. You will leverage modern AI tooling and LLM orchestration frameworks (LangChain, LlamaIndex, Smolagents, DSPy), manage high-performance caching layers with Redis, and utilize advanced developer workflows like the Cursor code editor to accelerate delivery velocity. Working in a fast-paced onsite environment with immediate interview slots today, you will drive technical excellence and mentor engineering talent.

Key Responsibilities

• Lead the end-to-end design, development, and scaling of enterprise-grade Python backend services and React frontend interfaces.
• Architect performant service layers utilizing Python (Flask/FastAPI) and Node.js to handle heavy data mutations and workloads.
• Build production-grade, responsive user interfaces utilizing React, TypeScript, and modern state management strategies.
• Implement expert-level real-time data synchronization using RESTful APIs, WebSockets, and gRPC-web protocols.
• Design and maintain high-throughput relational/NoSQL databases and caching layers (e.g., Redis) for seamless data lifecycles.
• Integrate AI tooling and LLM orchestration frameworks (LangChain, LlamaIndex, Smolagents, DSPy) into production workflows.
• Apply advanced prompt engineering and utilize elite developer environments like the Cursor code editor (indexing, composer, chat features).
• Collaborate closely with product managers, system architects, and cross-functional engineering teams in San Francisco.
• Conduct rigorous code reviews, mentor junior and mid-level developers, and champion software engineering best practices.
• Maintain comprehensive technical documentation, architecture specifications, and API runbooks.

Required Qualifications & Skills

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, Information Technology, or a related field.
• 12+ years of total professional software engineering experience, including 7+ years of deep engineering and system design background.
• Core stack mastery in Python (Flask/FastAPI) and Node.js for backend development, combined with React and TypeScript for frontend delivery.
• Proven expertise in system design, database architecture, caching layers (Redis), and scaling enterprise-grade backend services.
• Real-time protocol expertise including RESTful APIs, service orchestration, WebSockets, and gRPC-web.
• Hands-on experience with LLM orchestration frameworks (LangChain, LlamaIndex, Smolagents, DSPy) and advanced prompt engineering.
• Mastery of AI-augmented development tooling and code editors (Cursor code editor indexing, composer, and chat features).
• Professional availability for onsite employment in San Francisco, CA (Immediate interview slots available today).

Nice-to-Have Skills

• Advanced state management framework proficiency (TanStack Query, Zustand, or Redux).
• Professional certifications in cloud architecture (AWS Certified Solutions Architect or Google Cloud Professional).
• Prior working experience leading high-growth engineering teams in fast-paced Silicon Valley tech startups.
• Contributions to open-source AI projects, LLM toolkits, or published technical papers on generative AI architecture.
• Strong background in implementing CI/CD pipelines, containerization (Docker), and cloud infrastructure (AWS/GCP).

Application Information

• Recruiter: KK Software Associates Talent Acquisition
• Contact Name: Sushant Kumar (Talent Acquisition Specialist) [cite: Sushant kumar]
• Email: [e-mail] [cite: Sushant kumar]
• Phone: Unspecified
• Application URL: Unspecified
• Salary/Rate: Competitive and commensurate with senior executive experience
• Deadline: Open until filled (Urgent Backfill – Today’s interview slots available)
• Notice Period: Immediate availability preferred
• Contract Duration: Permanent / Full-Time (Onsite in San Francisco, CA) [cite: Sushant kumar]

When applying for senior AI-augmented full-stack roles, ensure your resume explicitly highlights your Python/React stack mastery, hands-on LLM orchestration (LangChain/DSPy), and proficiency with AI coding assistants like Cursor.