Roshan Rajan

July 2024 - Present

Seattle, WA

Replaced a legacy editorial pipeline with a vendor CMS ahead of a forced ownership transfer, owning requirements for a non-technical editorial team and translating them into the criteria that decided between 3 platforms; collapsed four-team incident response to one owner and lifted traffic 35% with a redesign that federated content across the retail site.
Built an event-driven Slack connector that ingested team channels into an internal LLM knowledge platform, with multi-tenant auth and signed requests; the pattern was adopted by 50%+ of Books teams for ad-hoc knowledge pipelines.
Authored the team's AI knowledge-infrastructure strategy and led it into two workflows: an on-call agent built from its SOPs and skills, sharpened by a companion skill mining developer chat sessions, that cut on-call load 60%; and an AI page-authoring path client teams and product managers used to ship pages with no hand-written code, cutting onboarding from 2 weeks to about a day.
Sole owner of 2 customer-facing APIs and 15+ services: ran the on-call rotation, drove security patching and tech-debt remediation, onboarded 20+ partner teams, and cut tickets from 45 to 6 per year.

Designed a zero-downtime index rebuild (parallel cluster, live cutover, audit backfill, data-quality gates), ran it in the NA and FE regions to lift data quality 30% and unblock 10+ client launches, then automated the 6-10 engineer-day process in Step Functions, reclaiming 32+ engineer-days/year across 4 regions.
Expanded a catalog live-update listener to 10 EU marketplaces, moving series recommendations from day-old data to real-time by fanning out events the upstream emitted only in the US; extending item-level updates across marketplaces drove a step change in write load, absorbed by a Batch Update API landing them across marketplace OpenSearch clusters at 2K requests/sec with graceful partial-failure handling.
Built the Recommendations Playground, letting clients create, test, and productionize strategies with no code changes, cutting implementation from weeks to minutes.

Designed the end-to-end system marketing teams used to attach and display blurbs, badges, and short-form content with products, serving 50K items to 1M+ users daily.
Shipped a validation and preview service for the editorial pipeline (validation API plus a UI verifying cover art and author pre-upload), preventing bad-data uploads from reaching production.
Automated a monthly content sync across catalog and content datastores, reclaiming 2 weeks/year and lifting stored data quality 30%.

Re-architected sign-in to move 25M+ users off a third-party OAuth provider onto first-party credentials, resolving the authentication paths a customer could arrive on where failure meant permanent lockout.

Experience