Current status: Now · Pelmorex · The Weather Network
Software Developer, React Native Kyoungjae Shin
Hi, I'm Eric. I've built mobile and web apps for 6 years, mostly in React Native, React and TypeScript. At Speer in Toronto I grew from developer to Technical Lead. Now I'm at Pelmorex, working on The Weather Network mobile app.
Three things I worked on at Speer. Each one is short: what broke and how we fixed it. The last stop is the app I work on now, at Pelmorex.
Stop 1
Telemedicine app · iOS, Android, web · New York and New Jersey
Messages in the app's chat went missing every so often, and it took us a while to see why. Stream Chat, our chat provider, was throttling our API calls. We cut down the calls we made, and nothing went missing after that.
React Native · TypeScript · Node.js · NestJS · PostgreSQL · Stream Chat · AWS · Loki
opens in a new tabStop 2
Crypto exchange · iOS and Android · Canada
Phones lose their connection mid-request, and when that happens the Netcoins app sends the same transfer again. With real money, that's a problem. I gave every transfer request an idempotency key, and the server uses it to spot the repeat and move the money only once.
React Native · TypeScript · Node.js · PostgreSQL · Redis
opens in a new tabStop 3
Chat assistant · Inside the Baker Health app · Built in 2026
When a member messages Baker Health, the AI assistant I built in 2026 can answer, or book or move a visit if that's what they want. The booking actions live on an MCP server. Other parts of the app call them too.
LangChain · OpenAI API · MCP · TypeScript · Node.js
opens in a new tabStop 4
Weather app · iOS and Android · Canada
Pelmorex ships one app as The Weather Network in English and as MétéoMédia in French, on iPhone, iPad and Android, with forecasts, live radar and severe weather alerts. I joined its Apps & Web team on November 16, 2026, and I work on the app in React Native.
React Native · TypeScript
opens in a new tabNewest first. My first few months at Speer overlapped with my last ones at Siemens, and I did my degree part time while working.
Pelmorex is the Canadian company behind The Weather Network. On its Apps & Web team I work on the mobile app in React Native: one app that ships as The Weather Network in English and as MétéoMédia in French.
Full-stack and mobile development, mostly for healthcare and fintech clients. Promoted to Technical Lead through project contributions and technical ownership.
Testing and repair for Ruggedcom network devices, the kind used at power utilities and factories.
The software design, database and testing courses ended up being the most useful for my job.
Three-year program, graduated in April 2019. GPA 3.851.
What I use, and the projects I've used it on.
| Skill | Used on |
|---|---|
| Mobile and web | |
| React Native |
|
| React |
|
| TypeScript |
|
| Next.js |
|
| Server and data | |
| Node.js |
|
| NestJS |
|
| PostgreSQL |
|
| Redis |
|
| Stream Chat |
|
| Cloud and tooling | |
| AWS |
|
| GitHub Actions |
|
| CI/CD |
|
| Loki |
|
| Jest |
|
| AI | |
| LangChain |
|
| OpenAI API |
|
| MCP |
|
| Practice | |
| Technical leadership |
|
| Code review |
|
| Mentoring |
|
| Technical interviews |
|
| System design |
|
| HIPAA |
|
Before software, I tested network hardware at Siemens Ruggedcom.
I wrote defect reports there every day. Turns out that's good practice for writing bug tickets.
I joined Speer in September 2021 and started a part-time BTech at McMaster that same month. Doing it while working full time took about four years. Finished in December 2025.
At Speer I grew from developer to Technical Lead, and by the end most of my time went to Baker Health. Since November 16, 2026 I've been at Pelmorex, working on The Weather Network mobile app.
I'm originally from Korea and moved to Canada, which is why this site also comes in Korean.
Written by people I worked with at Siemens Ruggedcom and Speer.
“Eric is one of the most sincere and dedicated professionals I have worked with. He brings a positive energy to the workplace and consistently demonstrates a strong work ethic, exceptional skills, and excellent communication within the team. His collaborative nature and willingness to help others make him a true asset in any setting.”
“I would highly recommend Eric for his outstanding commitment and reliability. His punctuality and dedication to tasks stand out, but more importantly, he handles complex responsibilities with minimal dependence on his superiors. Eric exemplifies what it means to be a great coworker.”
“Eric, thank you for your incredible contributions to Siemens Ruggedcom. Your hard work and unwavering commitment to excellence did not go unnoticed. Your efforts have made a significant impact, and your perseverance continues to inspire those around you.”
“Eric is an exceptionally talented developer with a keen eye for detail and a sincere approach to his work. He is not only highly skilled in coding but also genuine and dedicated in his interactions with others. Collaborating with him is a true pleasure, and his work consistently exceeds expectations.”
“Working alongside Eric has been a great experience. His ability to handle complex challenges with precision and his passion for continuous improvement are evident in every project he undertakes. Eric’s expertise as a full-stack developer is complemented by his clear communication and willingness to collaborate, making him an invaluable member of our team.”
“Eric is a thoughtful and dedicated professional who excels at problem-solving. As a QA engineer, I have seen firsthand how meticulous and detail-oriented he is in his work. Eric’s ability to collaborate effectively with different team members and his sincere desire to achieve excellence make him stand out.”
Want to talk about React Native, mobile apps or something on this site? Email is the best way to reach me.
Whitby, Ontario · Eastern Time
Pelmorex
The Weather Network