Senior Backend Engineer, Vision

About Sarvam Sarvam is building the bedrock of Sovereign AI for India. The company is developing India's full-stack sovereign AI platform, building across research, models, infrastructure and applications with a singular focus on making AI genuinely work for India. Sarvam works with leading enterprises and public institutions and is backed by Lightspeed, Peak XV, and Khosla Ventures. Sarvam partners with India's leading brands, including Tata Capital, SBI Life, CRED, IDFC, and LIC. About the Team Sarvam's research teams build our own vision-language models for OCR and structured extraction. This team builds everything around them — the serving harness that turns a 3B or 30B in-house model into a production document intelligence platform. The bet is specific: with the right harness — routing, decomposition, retries, verification, ensembling, layout awareness, confidence calibration — a small sovereign model should match or beat what teams today get from frontier hosted models like Gemini Flash, at a fraction of the cost and fully within India. Closing that gap is an engineering problem, and it is this team's problem. We run against the full messiness of Indian documents at population scale: PAN and Aadhaar, bank statements, GST filings, insurance and medical reports, 60-page contracts, legal filings and RFPs — across languages, scan quality, and layouts that were never designed to be machine-read. Stack: Go, Python, Temporal, REST, Kubernetes, PostgreSQL, Redis, object storage, OpenTelemetry-based observability. About the Role You will own the architecture of the serving harness for Sarvam's vision models — the system that has to deliver frontier-grade extraction quality out of 3B and 30B in-house models, at national scale, with cost and latency budgets that actually close. This means owning the hard trade-off surface directly: accuracy versus latency versus rupees per page. Multi-pass inference, model routing and cascades, self-consistency and verification passes, confidence-driven escalation, batching and caching strategy, GPU utilisation. These are the levers that decide whether the product works, and you will be the person deciding how to pull them. You will also set the reliability bar. These pipelines process documents that customers cannot afford to lose — KYC, loan underwriting, claims, contracts. Durability, idempotency, backpressure and graceful degradation are the baseline, not the roadmap. The architecture you set will be inherited by everything the team builds after you. What You'll Do Own the end-to-end architecture of the OCR and extraction serving harness: API layer, orchestration, inference layer, post-processing, delivery Design the accuracy harness — multi-pass extraction, ensembling, cross verification, schema-constrained decoding, confidence calibration, targeted re runs — and prove its gains against held-out evaluation sets Architect durable, resumable document workflows in Temporal: fan-out across pages, partial failure reco