Senior Backend Engineer

About the job

We are looking for a senior backend engineer to build and operate the core AI/ML-backed systems that power large-scale, consumer-facing products. Responsibilities: • Own and deliver end-to-end backend systems for AI product runtime, including orchestration, request lifecycle management, state/session handling, and policy enforcement. • Design and implement retrieval and memory primitives, end-to-end document ingestion, chunking strategies, embeddings generation, indexing, vector/hybrid search, re-ranking, caching, freshness, and deletion semantics. • Drive performance, reliability, and cost optimization, owning P50/P95 latency, throughput, cache hit rates, token and inference costs, and infrastructure efficiency. Requirements: • Bachelor's degree in computer science, engineering, or a related field, or equivalent practical experience. • 6-10 years of experience building backend systems in production, with 2-3+ years working on ML/AI-backed products.

Requirements

• Backend Systems
• Python
• API Development
• Distributed Systems

Qualifications

• Bachelor's degree
• 6-10 years of experience

Preferred Technologies

• Backend Systems
• Python
• API Development
• Distributed Systems

About the company

Proximity Labs focuses on building AI/ML-backed systems for large-scale applications.