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  4. AI Backend Engineer

AI Backend Engineer

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F

AI Backend Engineer

Flexon Technologies Inc.

$80,000–$110,000 / Year

Location

Rosemead, CA

Experience

—

Posted

Jun 23, 2026

Apply by

July 23, 2026

Applicants

0

Early applicantEasy applyFull-timeWork from Officeengineering

Sign in to apply on web or download the app for more options.

Job Description

We are seeking an AI Backend Engineer to join our team in Rosemead, CA. This is an onsite role focused on building and maintaining Python-based microservices and AI-enhanced APIs. The ideal candidate is versatile in constructing AI pipelines using LangChain, LlamaIndex, and AutoRAG, with hands-on experience in model optimization through Optuna and GridSearchCV. You will work closely with enterprise AI platforms, implementing robust guardrails and semantic retrieval systems to deliver high-throughput, production-ready solutions.

Key Responsibilities

  • Implement Python microservices and APIs (FastAPI/Flask/Django) with clean contracts, versioning, pagination, and rate limiting.
  • Build REST/GraphQL endpoints and internal SDKs to enable AI-enhanced features (prompt routing, retrieval, redaction) while maintaining strict separation from model ownership.
  • Implement asynchronous and event-driven processing (e.g., Celery/Kafka/queues) for high-throughput pipelines and background jobs.
  • Integrate services with enterprise AI platforms and LLM APIs (e.g., Azure OpenAI via enterprise gateway), handling prompt orchestration, tool invocation, moderation hooks, and response validation.
  • Enforce runtime guardrails: input sanitization, PII redaction, toxicity/NSFW filters, output signing, and fallbacks.
  • Implement semantic retrieval and vector search via approved platforms; do not train or host custom models.

Requirements

  • Python Full Stack Developer with 1-2 years of experience.
  • Proficiency in constructing AI pipelines using LangChain, LlamaIndex, and AutoRAG.
  • Model optimization experience using Optuna and GridSearchCV.
  • Hands-on experience with machine learning (ML) concepts.
  • Experience building APIs with FastAPI and/or Flask.
  • Familiarity with asynchronous/event-driven systems (Celery, Kafka, or similar queues).
  • Knowledge of REST and GraphQL API design principles.
  • Experience integrating with enterprise LLM APIs such as Azure OpenAI.

Skills Required

PythonVector SearchFlaskLangChainREST APIsGraphQLFastAPIAzure OpenAIAutoRAGMachine LearningApache KafkaGridSearchCVLlamaIndexCeleryOptuna

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Job Overview

Salary

$80,000–$110,000 / Year

Currency: USD

Job Type

Full-time

Experience

—

Minimum education

Other

English level

good english

Experience required

experienced only

Location

Rosemead, CA

Application Deadline

July 23, 2026

Total Applicants

0

About Flexon Technologies Inc.

F

Flexon Technologies Inc. is a leading company in the Technology sector, known for innovation and employee-centric culture.

View Company

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