SwiftUI Engineer

I design, build, and ship native products. My work spans polished multi-platform interfaces, production services, and open-source infrastructure.

James Sedlacek standing beside the Peloton logo in New York City

Selected work

Products built from first principles.

Strategy, product design, native implementation, backend systems, and shipping, carried through as one connected discipline.

Insights for Apps

A multi-platform App Store intelligence workspace spanning growth, marketing, monetization, trust, and safety. It turns noisy platform data into clear decisions.

  • Native iPhone, iPad, and Mac experiences
  • Growth, marketing, and acquisition intelligence
  • Monetization, trust, and safety workflows
Download on the Mac App StoreDownload on the App Store
Insights for Apps acquisition analytics on macOS
Insights for Apps acquisition analytics on iPhone

Trading Journal

A trading companion for reviewing decisions, understanding performance, and building better habits through a calm, data-rich native experience.

  • Fast structured trade capture
  • Actionable performance analytics
  • Localized, subscription-backed product
Download on the App Store
Trading Journal showing a list of completed tradesTrading Journal performance analytics

Open source

Infrastructure other SwiftUI teams choose.

1,534GitHub stars across public projects
Explore all open-source work

Experience

Product judgment backed by engineering depth.

December '24 - Current
Sedlacek SolutionsSwiftUI Engineer

Built and shipped Insights for Apps and Trading Journal across Apple platforms, alongside open-source SwiftUI packages adopted and improved by the community.

July '23 - May '26
PelotonSwiftUI macOS Engineer

Contributed to the Content team, building an internal macOS tool instructors used to plan classes, including exercise and music selection, notes, segmentation, and class management.

April '22 - July '23
MethodUIKit iOS Engineer

Worked on the CareCredit team and the Synchrony Plugin team, building credit card experiences and an SDK used by major partners including Amazon and Sam’s Club.

Values

How I approach the work.

Principles that shape the products I build, the technical decisions I make, and how I work with a team.

Users first

Start with a genuine user need, understand the context around it, and work backward toward the right solution.

Craft matters

Treat quality, polish, and beauty as part of functionality. The details shape how a product feels and how much users trust it.

Build strong foundations

Invest in architecture and tooling that make the product easier to evolve, the team faster, and future decisions less expensive.

Make complexity feel simple

Take on the difficult technical work so the experience can remain clear, focused, and natural for the person using it.

Be open and direct

Share context, surface concerns early, and communicate candidly with care for the people receiving the message.

Collaborate without ego

Debate ideas honestly, change course when a better answer appears, and optimize for the strongest outcome rather than personal ownership.

Available for the right opportunity

Set up an interview.

Choose a time that works for you to talk about the product, the team, and where I can make an impact.