Isabel Chen

OptiSigns

Software Engineer · NestJS · GraphQL · Redis · MongoDB · Kubernetes · GCP · Cloudflare · Remote · May 2026 – Present

Digital signage SaaS platform

• Root-caused and fixed a Sev-2 storage-quota ledger bug affecting 6,243 companies (dual-write asymmetry drove usedStorage negative); shipped a symmetric create/update/delete fix on open-api and verified on production.
• Built an internal infra monitoring app to surface environment health across CI/CD, Kubernetes, DNS/certs, and Cloudflare—centralizing status that previously lived in scattered dashboards and Slack noise.
• Migrated 6 environments (~30 hosts) across CI/CD, DNS, certs, Cloudflare Workers/Pages, and allowlists; wrote a runbook for repeatable cutovers.
• Ramped from scio3 React/TypeScript frontend bugs to owning infra in ~4 weeks—stood up a full environment end-to-end (GitLab CI/CD, Kubernetes, GCP, Cloudflare), then migrated the fleet.
• Shipped customer-facing UI work: fixed a Sev-2 Preview takeover bug so screen preview matched live wall state; added plan-gated controls for static egress-IP on data-source manifests; worked across designer iframe postMessage bridges and GraphQL-driven views.
• Extended static egress-IP across 5+ feed/data-source microservices; moved secrets to GCP Secret Manager in CI/CD; diagnosed Redis OOM from unbounded keys missing TTL.

OmegaUp

Software Developer · PHP · MySQL · Redis · Python · Remote · Oct 2025 – May 2026

Education platform

• Resolved cross-stack production issues across backend services, MySQL, and Redis on Linux, improving reliability for a coding contest platform serving 100K+ users with large-scale concurrent code runs.
• Designed and implemented a secure multi-language code execution platform using ephemeral Docker sandboxes (network / file-system isolation, CPU and memory limits, timeouts) for untrusted code, delivering sub-second to seconds-level execution feedback.
• Persistence-layer reliability engineering (query optimization, transaction boundaries, schema constraint remediation): 60% reduction in database error rates and 35% lower MTTR.

Springer Capital

Full Stack Developer Intern · Python · TypeScript · WebSocket · Chicago, IL · Aug 2025 – Oct 2025

Financial services

• Re-architected analytics pipelines (Python, Redis, ClickHouse) on a small team: 85% API latency reduction (300ms → 50ms) and real-time data dashboards.
• Shipped TypeScript workflow features and real-time views using REST and WebSocket APIs for latency-sensitive internal tools.
• End-to-end analytics dashboards (React, TypeScript) handling 50K+ monthly queries for enterprise decision-making.
• CI/CD consolidating 12 microservices into a monorepo with automated GKE deployments: release cycles from 30 minutes → 5 minutes.

University of Michigan

Software Engineering Intern & Research Assistant · Ann Arbor, MI · Aug 2024 – Mar 2025

• Optimized backend data retrieval with TypeScript and state management improvements: 15% faster server response times.
• Led 5 interns building a web-based email management platform (React, Node.js) with Google OAuth 2.0 and Gmail API integration.
• AWS Lambda pipeline (Python, DynamoDB, API Gateway) for research activity logging—saved researchers 50+ hours per month.
• Co-authored a published climate research paper: Characterizing Temperature and Precipitation Tails via Expected Shortfall Regression (Journal of Climate).

Temu

Software Engineer Intern · C++ · Redis · Shanghai, China · Jun 2024 – Sep 2024

E-commerce

• C++ distributed crawler/indexer with 16 worker threads: ~10K docs/sec index-build throughput via segment-based indexing.
• Low-latency search at scale with Redis caching: P50 5ms / P95 20ms / P99 50ms, 85–95% cache hit rate on hot URLs.
• Crawl deduplication cut redundant fetches by 60–80%, reducing bandwidth and processing overhead.
• Linear-scaling indexing/storage pipelines: ~2GB memory per 1M docs, stable 60–70% CPU under multicore load.