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Kayi (Alan) Shum

San Jose, CA · [email protected] · linkedin.com/in/kyshum · github.com/alankyshum

Summary

Staff Software Engineer with experience building GenAI products, distributed systems, enterprise integrations, and developer productivity infrastructure at LinkedIn scale. Led Account IQ, LinkedIn Sales Navigator's first GenAI feature, and delivered full-stack systems serving millions of daily users. Strong in backend architecture, LLM integrations, TypeScript, Node.js, Python, React, APIs, and technical leadership.

Skills

AI and Data: Generative AI, LLM platforms, LangChain, prompt engineering, semantic search, RAG pipelines, real-time analytics, ML model integration

Backend and Systems: Distributed systems, REST APIs, microservices, async processing, data pipelines, API design, service-oriented architecture

Languages and Runtime: TypeScript, JavaScript, Node.js, Python, SQL, Java, Ruby

Frontend and Frameworks: React, Ember.js, Vue.js, Streamlit, Express.js

Infrastructure and Practices: Docker, Kubernetes, CI/CD, observability, performance optimization, A/B testing, analytics instrumentation, security-first design, Salesforce, Microsoft Dynamics

Professional Experience

LinkedIn — Staff Software Engineer

Apr 2025–Jul 2026 · San Jose, CA

  • Reduced AI-agent test iteration time by 92%, from 2+ minutes to approximately 10 seconds, saving an estimated 750 engineer-hours per year across a 10-engineer team.
  • Drove a code-quality initiative that reduced Sales Assistant bug report rate by 40%.
  • Designed and executed a full-stack lazy migration from Seller Identity to the Campaigns table with complete backfill, enabling multi-campaign support.
  • Designed a dual-write migration plan for business-critical Unified Criteria data with phased rollout and zero-downtime goals.
  • Authored an RFC and led end-to-end delivery of the Lead Reevaluation System across 14 tickets over four months, resolving 3 Critical and 2 Blocker issues.
  • Co-designed and shipped rate-limiting infrastructure that defined per-user limits, controlled LLM and storage costs, and unblocked Sales Assistant's public ramp.
  • Verified deployment safety compliance across 100% of LinkedIn Sales Solutions major products after Incident 6106.
  • Built and deployed a Google Sheets MCP integration for Captain, adopted by 3+ teams with approximately 100 weekly users and 30% weekly retention.
  • Established an organization-wide LSS RFC repository and Markdown-based workflow for AI-assisted engineering.

LinkedIn — Senior Software Engineer, Sales Navigator

Oct 2020–Apr 2025 · San Jose, CA

  • Architected and shipped Account IQ, LinkedIn Sales Navigator's first enterprise GenAI feature, as sole frontend engineer; drove 17% WAU growth and supported approximately 40,000 daily active sessions at launch.
  • Integrated a Java request-routing and data-normalization service over gRPC with a Python/LangGraph backend; delivered offline-generated LLM insights on demand with recurring refresh jobs.
  • Built CRM integrations connecting Salesforce and Microsoft Dynamics, serving 13,000 daily users with synchronization and writeback workflows.
  • Developed AI-assisted search and messaging features across Node.js services, REST APIs, and React frontends, contributing to 4.2%–17% WAU growth across multiple entry points.
  • Designed and deployed Node.js/Express mid-tier microservices handling 100,000+ requests per day with less than 200 ms p95 latency.
  • Led a 200,000+ LOC TypeScript migration with custom ESLint rules and automated tooling while maintaining production stability.
  • Improved application performance by 15% through bundle splitting, lazy loading, critical-path optimization, and technical-debt reduction.
  • Mentored 5+ engineers and established architectural, type-safety, accessibility, and AI-feature standards.
  • Created the Tslix automation tool to identify overdue A/B experiments, closing 23% of the backlog within two months.

LinkedIn — Software Engineer

Oct 2018–Oct 2020 · San Jose, CA

  • Developed lighthouse-guest-web, reaching 170,000 daily visits and ranking as the 8th most visited LSS page.
  • Built full-stack features across REST APIs and React, including analytics instrumentation and A/B testing frameworks.

Compass / Sage — Frontend Engineer

Jul 2015–Oct 2018 · San Francisco Bay Area

  • Built a full-stack real estate analytics platform with React/Vue.js frontend and Ruby/Sinatra backend for multi-tenant SaaS customers.
  • Developed REST API endpoints and PostgreSQL database operations, including migrations, CRUD operations, and query optimization.
  • Implemented analytics dashboards with HighCharts.js and Mixpanel event tracking.

Earlier: Software Engineer, FansWIFi (Hong Kong); Software Engineer, KeptMe Pty Ltd (Hong Kong).

Education

Bachelor of Science in Computer Science, Hong Kong University of Science and Technology (HKUST) — 2012–2016

Exchange Programme, Korea Advanced Institute of Science and Technology (KAIST) — 2015

Languages

Cantonese (Native) · Mandarin (Native) · English (Fluent)