Jun Chen

Senior Software Engineer

Draper, UT · wdidwlia@gmail.com · github.com/sarabande · linkedin.com/in/jun‑chen‑1263b125

Professional Summary

Senior backend engineer with 10+ years building distributed systems, data platforms, and cloud infrastructure. Most recently shipped Go REST APIs for an IoT smart-lock platform at Janus International (Noke). Deep experience in functional programming (Go, Scala), real-time streaming at 300K events/sec, and cloud tooling (AWS, Terraform, Kubernetes).

Experience

Janus International (Noke)

Senior Software Engineer Lehi, UT | September 2023 - April 2026

Senior backend engineer on the SmartEntry IoT smart-lock platform — 40+ Go microservices powering access control for self-storage facilities nationwide.

Contributed across the end-to-end device pipeline — firmware provisioning, gateway routing, command dispatch, core business logic, and event notification — spanning AWS (RDS, SSM, Lambda, API Gateway).
Unified Sitelink and Breeze PMS integrations behind a generic Unit/Tenant abstraction, eliminating duplicated client code across both adapters.
Improved SmartEntry core reliability: added site-timezone and outage caching; normalized inbound event data to remove downstream parsing inconsistencies.
Remediated high-severity pentest findings across 7+ Go services — profiler endpoint exposure, production goroutine leak, JWT CVE, CORS misconfiguration, and password policy gaps.
Built team-adopted automated test infrastructure (Playwright e2e, 160+ specs across 5 role tiers) and a k6-based perf framework exercising 100–2,000 concurrent users against production-scale fixtures.
Extended the React portal with a new installed-sites UI and Sentry-based frontend observability (third-party error filtering).

BMW China Services, Ltd.

Senior Software Developer Shanghai | November 2020 - June 2023

Implemented daily ML batch job for the Pothole Warning pipeline on AWS in Python, improving detection accuracy for the connected-car fleet.
Designed and built the Road Clearance pipeline integration test suite from scratch, converting ad-hoc road geometry data checks into a specific, maintainable test harness.
Automated the Pothole Warning infrastructure with Terraform, reducing manual deploy overhead and eliminating configuration drift across environments.

Qianxun Spatial Intelligence, Inc.

Senior Software Engineer Shanghai | August 2017 - October 2020

Core contributor on the corporate monitoring platform team; shipped an automated analytics engine that significantly reduced manual data-quality tracking across the satellite feed.
Implemented a distributed data-collection system supporting arbitrary SNMP, ping, and Telnet probes across hundreds of machine nodes.
Built streaming applications processing 300K events/sec to derive minute-level operational metrics; contributed core transform-and-distribute modules to the metrics pipeline.

C.H. Robinson Worldwide, Inc.

Java Developer Shanghai | January 2015 - April 2017

Maintained the Asia-Pacific export/consolidation system and developed an EDI shipping platform for major shippers in Greater China.
Re-architected the U.S./China batch RPC exchange, resolving a long-standing performance bottleneck in shipment-notice processing.

Gemalto Technology Shanghai Co., Ltd.

Perso Engineer Shanghai | 2013 - 2014

SIM card personalization on .NET.

University of Miami

Database Analyst 2011 - 2012

GPS Android app + geospatial web UI.

University of Iowa

Research Assistant 2010 - 2011

C++ Range-Tree for Time-Space Kriging; Python/C NASA HDF processing.

ICTS, University of Iowa

System Administrator 2009 - 2010

Puppet modules across 200 nodes; RHEL Kickstart CGI.

Skills

Languages: Go, Scala, Java, Python, TypeScript, SQL, Shell
Backend: REST APIs, microservices, Spring Boot, Akka
Cloud & Infra: AWS, Terraform, Docker, Kubernetes
Data: MySQL, PostgreSQL, MongoDB, Redis, Spark

Education

Master of Science in Informatics, University of Iowa (2009-2011)
Bachelor of Arts in Public Finance, Fudan University (2004-2008)

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