Hi, my name is
Yujia Lin.
I build things at scale.
Building high-scale systems at the intersection of fintech, AI, and distributed infrastructure.
00.About Me
Senior full-stack software engineer with 8+ years of experience in financial services, fintech, and enterprise software — with hands-on AI/ML/NLP engineering in production. I've fine-tuned LLMs, built IVR infrastructure handling hundreds of thousands of migrated accounts, and architected systems tracking 6.5M+ monthly customer interactions. I thrive in high-ownership environments where engineering decisions directly drive business outcomes.
I'm a Y Combinator Startup School alum (2018) and have worn many hats — from co-founding a restaurant tech platform to leading engineering teams at a Fortune 500 financial institution. I believe in ownership, fast iteration, and shipping things that actually matter.
Certifications & Memberships
- AWS Certified Solutions Architect – Associate
- Senior Member, IEEE
- Member, Cloud Native Computing Foundation (CNCF)
CVE Findings
Stored XSS in NationalSecurityAgency/skills-service via User Registration Enabling Admin Account Takeover
OS Command Injection via unvalidated IN_FILE_ENDING / OUT_FILE_ENDING in Executrix
8+
Years of Experience
6.5M+
Monthly Interactions Tracked
$200K+
OPEX Savings Delivered
01.Experience
Senior Software Engineer @ Spectrum Security
Jul 2026 – Present · San Francisco, CA (Hybrid)
Senior Software Engineer @ Capital One
Apr 2023 – May 2026 · McLean, VA
- Led a team of 5 engineers to fine-tune Mistral-7B on IVR call transcripts using PyTorch and AWS SageMaker; integrated into a LangChain chatbot surfacing real-time summaries for 10K+ agents — eliminating caller repetition.
- Led IVR routing for the Capital One BackBook migration, directing 500K+ migrated Discover accounts with zero service disruption.
- Designed and built a full-stack IVR monitoring system tracking 6.5M+ monthly calls with real-time alerting and anomaly detection.
- Delivered a self-service IVR integration projected to save $200K+ annually in OPEX by automating fraud and dispute workflows.
- Modernized IVR architecture from legacy VXML to Omilia Cloud Platform, improving routing efficiency by 20%.
- Expanded Omilia IVR to support Spanish NLU, driving a 4% increase in self-service utilization.
Full-Stack Software Engineer @ Pathway Labs
Feb 2023 – Apr 2023 · San Francisco, CA
- Enhanced the Student Information System admissions dashboard, reducing page load times by 10% and improving admin workflows for high-volume student record processing.
Full-Stack Software Engineer @ BunBao.com
May 2019 – Dec 2022 · Fremont, CA
- Architected a custom ERP system from scratch managing purchasing, HR, and inventory for a multi-location food business — replacing all manual spreadsheet workflows.
- Scaled the engineering team from 1 to 4 developers; established Git branching, code review standards, and CI/CD pipelines.
- Led development of a React Native mobile tool that digitized kitchen and delivery operations, increasing task throughput by 70%.
- Integrated Square payment APIs, improving transaction throughput by 50%.
- Improved user onboarding UX, reducing sign-up steps by 80% and significantly increasing conversion rates.
Full-Stack Software Engineer (Part-Time) @ WiFrost
Apr 2021 – Jul 2021 · San Francisco, CA
- Developed an IoT-focused speed test service to monitor network performance.
- Automated cloud resource provisioning for Magma Core deployments with Terraform, reducing setup time by 50%.
Co-founder & Full-Stack Software Engineer @ Menupedia
Sept 2018 – May 2019 · San Francisco Bay Area, CA
- Built and launched a digital ordering SaaS platform, reducing restaurant table turnover time by 20%.
- Operated a local delivery service using the platform in Tucson.
- Graduated from Y Combinator Startup School, Class of 2018.
02.Skills
Languages
AI / ML
Frontend
Backend
Data & Messaging
Cloud & DevOps
03.Projects
LaborLens
Web platform for searching and analyzing U.S. Department of Labor records — prevailing wage determinations and PERM labor certifications. Stream-processes large DOL Excel disclosures into MongoDB with real-time import progress and JWT-based role access control.
- Filters PWD & PERM data by company, title, case number, location, and year
- Real-time bulk import from DOL disclosure datasets
- Deployed via GitOps pipeline on k3s + ArgoCD
Omilia IVR Dashboard
Production monitoring platform for IVR call infrastructure at Discover Financial Services. Surfaces real-time API error rates, call-flow drop-off points, and anomaly alerts with immediate visibility into service degradation.
- 6.5M+ monthly interactions tracked
- Faster incident detection & root-cause analysis
- Improved SLA adherence across contact center
BunBao ERP System
Custom ERP platform built from scratch to support a multi-location food business. Became the operational backbone covering purchasing, HR, inventory, vendor payment reconciliation, and cost center reporting.
- 20K+ customers served
- 2K+ daily delivery boxes processed
- 100+ employees managed
Menupedia Digital Ordering Platform
Digital ordering and delivery SaaS for restaurants. As co-founder, designed the product, built the full stack, onboarded clients, and ran a live delivery service on top of the platform.
- 20% reduction in table turnover time
- Eliminated paper-based workflows
- Y Combinator Startup School 2018
04.Publications
05. What's Next?
Get In Touch
I'm currently open to senior engineering and technical leadership roles — especially at startups moving fast in fintech, AI, or infrastructure. Whether you have a role in mind or just want to talk tech, my inbox is open.