Chenran Jin 金琛然
Software Engineer · Boston, MA
About
I'm a backend engineer with five years building and modernizing production Java / Spring systems across insurance and e-commerce. Most recently I led a solo Java 8 → Java 21 platform migration across two revenue-generating purchase sites — five major modules, three weeks, zero downtime — and I work across legacy modernization, rating-system replacement, and multi-channel commerce.
Outside of work I'm the technical director of SwiftGG, an open-source Swift documentation community with 21,000+ GitHub stars and 30+ contributors across time zones. I like building things for communities I care about — developer events, comedy clubs, classrooms.
Selected Works
SwiftGG
The leading Chinese-language Apple developer community — Swift documentation with 21,000+ GitHub stars, proposed as an official Swift.org reference.
swiftgg.team iOS · SwiftUILanyard
An event-badge iOS app for the SwiftGG community, designed and shipped to the App Store — Cloudflare, Supabase, and Stripe under the hood.
App Store Web · EventLET'S VISION
Built the event website and ticketing system for China's first Apple Vision Pro developer event.
letsvision.swiftgg.team Board · CommunityDingho Comedy
Boston's Chinese-language stand-up comedy club — board member, and builder of its brand and web presence.
dhcomedy.com CommunityCoding Girls
A community initiative helping more girls discover programming — technology and web platform.
codinggirls.cn Technical DirectorMUNCS
A decade of technical direction for the Model UN conference — registration systems and the web platform, since 2014.
muncs.orgExperience
Plymouth Rock Assurance
Senior Software Engineer · Shared Technology Services
- Led the upgrade of two production insurance purchase platforms from Java 8 to Java 21 and legacy Spring to Spring Boot — all five major modules delivered solo in three weeks, zero downtime, no production incidents.
- Drove the migration with AI coding agents, compressing a multi-engineer, multi-month effort into a three-week delivery.
- Contributed to replacing the rating & quoting engine (PolicyStar → Sapiens Policy Pro) across five states, reworking the quoting flow for each state's regulatory filing.
- Sole maintainer of mc.plymouthrock.com and company-wide administrator of the ImageRight document platform — 10TB+ of records across every line of business.
SwiftGG
Technical Director & Core Team Member
- Technical lead of the leading Chinese-language Apple / Swift developer community — 21,000+ GitHub stars, 100,000+ developers reached.
- Designed, built, and shipped Lanyard, a SwiftUI iOS app, to the App Store on a Cloudflare, Supabase, and Resend stack with Stripe billing.
- Integrated Stripe, WeChat Pay, and Alipay for cross-border payments across SwiftGG products and events.
Asia Food Market
Software Engineer
- Built a Spring Boot inventory service synchronizing 28,000+ SKUs between SAP and Shopify in real time, replacing manual reconciliation.
- Deployed multi-location e-commerce infrastructure across four stores on a hybrid cloud of on-prem servers, AWS S3, and CloudFront.
University at Buffalo, SUNY — B.A. Mathematics, Computational & Applied · 2021
Craft
- Languages
- Java · Python · TypeScript · JavaScript · Swift · SQL · C/C++
- Backend
- Spring Boot · microservices · RESTful APIs · event-driven architecture · Hibernate
- Data
- PostgreSQL · MySQL · MSSQL · schema design · query optimization
- Cloud & Ops
- AWS (EC2 · S3 · Lambda · CloudFront) · GCP · Docker · Jenkins · CI/CD · Cloudflare
- Frontend
- React · Next.js · Node.js · SwiftUI
Contact
Based in Boston, always open to interesting projects and good conversations. The fastest way to reach me:
hello@jin.cr