Sachidananda (Sachin) Singh
Senior Engineering Manager, Supply Chain Engineering at Hims & Hers Health
Austin, Texas, United States
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Sachidananda (Sachin) Singh is a Senior Engineering Manager at Hims & Hers Health, where he leads supply chain and fulfillment engineering. He has 17 years of engineering experience, including roles at Hims, AWS and Wayfair. His expertise spans distributed systems, cloud infrastructure and applied AI. He is based in Austin, Texas.
He is the author of Supply Chains Are Distributed Systems, a book connecting engineering principles with physical operations.
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When retries change the inventory count
A warehouse event can arrive twice, arrive late or disappear from the consumer's view. Each failure changes what software believes is available. This session uses a small synthetic inventory stream to show the difference between delivery guarantees and correct state.
We follow a naive consumer, add persistent deduplication, then introduce an authoritative snapshot with a source sequence watermark. A delayed event arriving after that snapshot provides a concrete test of whether recovery counts the same movement twice.
The example also exposes a detection limit. A missing final event can leave the projection wrong while the sequence gap list is empty. The discussion covers what a snapshot must guarantee, which events it covers, and why physical counts still need their own reconciliation process.
Attendees will be able to explain where duplicate suppression belongs, design a recovery test around a watermark, and identify situations that a gap detector cannot observe. The demonstration uses synthetic data and makes no claims about an employer's architecture or results.
Available for consideration. Proposed duration is 30 minutes, with 10 minutes for questions. Intended for backend engineers and engineering leaders working with operational systems.
The inventory promise across a software boundary
An available quantity is a promise made using information from several systems. A storefront, warehouse and carrier can each hold a valid local record while disagreeing about what should happen next.
Drawing on the inventory and messaging topics in Supply Chains Are Distributed Systems, this session follows a fictional order across those boundaries. It examines who owns each state transition, which confirmation makes a promise safe, and how a delayed message changes the decision.
The session compares holding a reservation, accepting temporary uncertainty and compensating after a failure. Each choice has an operational cost. A short design exercise asks participants to define the source of truth for one transition and the evidence needed to reconcile it after an outage.
Attendees leave with questions they can apply in an architecture review and a concrete recovery scenario to test with their operations counterparts. Examples are fictional and do not disclose employer systems.
Available for consideration. Proposed duration is 30 minutes, with 10 minutes for questions. Intended for engineering managers, architects and operations leaders.
Sachidananda (Sachin) Singh
Senior Engineering Manager, Supply Chain Engineering at Hims & Hers Health
Austin, Texas, United States
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