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INFUSE · 1 month ago

Semantic Backend Engineer (Contract, Remote)

United States

Contract

Remote

Mid Level

Infuse is focused on building a rich catalog of marketing-grade B2B content. They are seeking an Applied ML Engineer to own the semantic ingestion pipeline, transforming raw PDFs into structured resources and ensuring high-quality content through various filtering and classification processes.

AdvertisingB2BContent MarketingDigital MarketingLead GenerationLead ManagementPublishing

H1B Sponsor Likely

Responsibilities

Own the ETL pipeline from raw PDFs (S3-ingested) to structured resources

Finalize our summarization + classification flow using open-source models with GPT-4o fallback

Apply filtering logic (≤3 years old, ≤100 pages, etc) to enforce resource quality

Map each asset to the specific topic taxonomy (10+ per topic across ~9,000 topics)

Generate dense embeddings using sentence-transformers

Load and query embeddings using Milvus or pgvector

Implement “freshness” logic to identify and index only new or updated content based on file diffing, crawl timestamp, or document hash

Build a QA/eval harness: format compliance, recall@5, drift monitoring

Expose /v1/semantic-search via FastAPI, with filtering and rank fusion

Collaborate closely with our Tech Lead on UX integration and snippet generation

Qualification

ETL pipelineSemantic searchPythonFastAPISentence-transformersOpenAI APIsMilvusPgvectorCollaborationProblem-solving

Required

Own the ETL pipeline from raw PDFs (S3-ingested) to structured resources

Finalize our summarization + classification flow using open-source models with GPT-4o fallback

Apply filtering logic (≤3 years old, ≤100 pages, etc) to enforce resource quality

Map each asset to the specific topic taxonomy (10+ per topic across ~9,000 topics)

Generate dense embeddings using sentence-transformers

Load and query embeddings using Milvus or pgvector

Implement “freshness” logic to identify and index only new or updated content based on file diffing, crawl timestamp, or document hash

Build a QA/eval harness: format compliance, recall@5, drift monitoring

Expose /v1/semantic-search via FastAPI, with filtering and rank fusion

Collaborate closely with our Tech Lead on UX integration and snippet generation

Python, PyTorch, sentence-transformers, OpenAI APIs, or similar pretrained LLMs

FastAPI, Milvus or pgvector, PyPDF/Tika, Airflow or Lambda for orchestration

Docker, GPU scheduling, Athena/Redshift SQL

You've built ML pipelines that touched real users, not just notebooks

You've worked on semantic search, embeddings, or large-scale tagging

You've wrestled with unstructured data and love turning chaos into clarity

You like working fast, iterating with feedback, and tracking metrics that matter

Company

INFUSE

DEMAND EXCELLENCE DELIVERED

Founded in 2012

Boca Raton, Florida, USA

1001-5000 employees

http://infuse.com

H1B Sponsorship

INFUSE has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)

Distribution of Different Job Fields Receiving Sponsorship

Represents job field similar to this job

Trends of Total Sponsorships

2025 (6)

2024 (2)