CV · Sebastian Musiał
For 10+ years I’ve been building web and mobile products in JavaScript and TypeScript — from architecture and design systems to production. Today I work AI-native: with AI agents I ship faster, without cutting corners on quality.
kontakt@sebastianmusial.pl · linkedin.com/in/musialsebastian · github.com/sebastianmusial · sebastianmusial.pl
About
I started freelancing before university, building websites and apps for small businesses. Since 2014 I’ve been at Chilid, now Boldare, building products for clients all over the world — from fintech and e-commerce to SaaS.
Every day I write code together with AI agents. And when a product needs it, I build AI into it: assistants, RAG or automation.
Stack
Click a technology to see what I use it for and in which selected projects it proved itself.
Selected projects
Each one started with a conversation about a problem and ended with a working product. Remotely, from Poland, for clients on three continents.
Poland · UTC
United Kingdom1 / 8
A mobile app for international remittances: API refactor to a feature-based architecture, JWT auth, migration to a new payments API, error monitoring. Planning and reviews directly with the client.
Western Europe2 / 8
AI-first development of a global platform, inside the client’s team. Working with AI agents every day.
USA3 / 8
A store redesign focused on UX and conversion: a Storybook design system, product listings, carousels and responsive layouts.
USA & Canada4 / 8
Suggested actions for tickets in a food safety platform, AI in restaurant audits, automated CV screening. From a workshop with the client to a demo. Plus open-source tooling for building assistants.
USA & Canada5 / 8
A platform for the US and Canada: admin panel with roles, PDF reports, forms, filters and maps, EN/FR versions. Integrated a new module into the main app and reviewed the team’s code.
Gulf region6 / 8
An assistant answering questions about loads, sales and purchases on the client’s data: first RAG on LangChain, then OpenAI Assistants with a knowledge base. Decisions recorded in ADRs. Plus an insurance advisor prototype.
Gulf region7 / 8
A Gulf-region product: shared component library in Storybook, Angular upgrade and ESLint migration, RTL, releases and code review for the client’s developers.
China8 / 8
The whole foundation: repository, store, routing, tests, CI, test environments and documentation.
AI-first development of a global platform, inside the client’s team. Working with AI agents every day.
A mobile app for international remittances: API refactor to a feature-based architecture, JWT auth, migration to a new payments API, error monitoring. Planning and reviews directly with the client.
An assistant answering questions about loads, sales and purchases on the client’s data: first RAG on LangChain, then OpenAI Assistants with a knowledge base. Decisions recorded in ADRs. Plus an insurance advisor prototype.
Suggested actions for tickets in a food safety platform, AI in restaurant audits, automated CV screening. From a workshop with the client to a demo. Plus open-source tooling for building assistants.
A store redesign focused on UX and conversion: a Storybook design system, product listings, carousels and responsive layouts.
A platform for the US and Canada: admin panel with roles, PDF reports, forms, filters and maps, EN/FR versions. Integrated a new module into the main app and reviewed the team’s code.
A Gulf-region product: shared component library in Storybook, Angular upgrade and ESLint migration, RTL, releases and code review for the client’s developers.
The whole foundation: repository, store, routing, tests, CI, test environments and documentation.
Experience
From the Chilid agency to Boldare: websites, single-page apps, long-running products and AI.
sebastian@boldare ~/career $ git log --graph --oneline career
A mobile app from the API to the screens, and AI agents in everyday work.
Added:+ React Native+ Expo+ Next.js+ Claude Code+ Cursor
AI assistants, LLM proofs of concept and automation for clients.
Added:+ OpenAI API · Assistants+ LangChain+ NestJS+ WhatsApp Business API
Long product projects for clients in the US, Canada and the Gulf. Code review, and technical interviews from 2021.
Added:+ Storybook+ RTL · i18n+ CI/CD · Git
Chilid becomes Boldare. Lead Front-end on an app built from scratch, team coordination, internal company talks.
Added:+ TypeScript+ NgRx+ RxJS+ Jest+ Docker
MSc, Computer Science (2015–2017).
First single-page apps in React and Angular, React workshops for interns.
Added:+ React+ Redux+ Angular
Started as a Junior Front-end Developer: websites and apps for agency clients.
Added:+ JavaScript+ CSS / SCSS+ WordPress
BEng, Computer Science (2012–2015).
Commissioned websites and apps, tailored for small and medium businesses.
Added:+ JavaScript+ CSS / SCSS+ WordPress
sebastian@boldare ~/career $
2010
Commissioned websites and apps, tailored for small and medium businesses.
2012
BEng, Computer Science (2012–2015).
2014
Started as a Junior Front-end Developer: websites and apps for agency clients.
2016
First single-page apps in React and Angular, React workshops for interns.
2017
MSc, Computer Science (2015–2017).
2018
Chilid becomes Boldare. Lead Front-end on an app built from scratch, team coordination, internal company talks.
2019
Long product projects for clients in the US, Canada and the Gulf. Code review, and technical interviews from 2021.
2023
AI assistants, LLM proofs of concept and automation for clients.
2025
A mobile app from the API to the screens, and AI agents in everyday work.
Learning
Tech moves faster than any course. I keep up with JavaScript, TypeScript and AI, and try new tools in real projects — today I write code together with AI agents.
Achievements
“One of the best frontend developers I worked with”
Contact
Hiring, or have a project in mind? Drop me a few lines. I reply within a day.
