Sycamore Relay

Barcelona

Design & engineering studio

Barcelona

Apps & websites, hand-wired.

Sycamore Relay is a new studio from Nemanja Vlahović, founding engineer at Recint. Ten years of shipping iOS.

Start a project See the work

(01)

Track record

Nemanja, 2018 — 2026

The studio is new. This is Nemanja’s work from before it: as founding engineer, contractor and employee.

01 — Founding engineer · 2026–

Recint

An iOS app for putting outfits together and sharing taste. Built from the first commit: the app, the API, the admin.

Role
Founding engineer
Since
2026
Built
iOS app, API, admin
Stack
SwiftUI · TypeScript · Postgres
recint.com
recint.com: “the new new.” over a campaign shot of three women in a white studio
  • Recint profile: Somi Lee, with outfits, collections and likes
  • Recint outfit page: Salomon, Tom Ford and Carhartt WIP pieces, with Remix and more like this
  • Recint communities: Cyberpunk International, Tokyo 4-Chome, Barcelona anarquista and kpop punk
  • Recint map: 57 stores in Paris that carry your brands
Circlin on the App Store: a secondhand fashion marketplace Circlin seller profile screen

02 — Contract · iOS & backend

Circlin

Video-first fashion resale, Switzerland. iOS architecture and GraphQL backend: AI listings, Stripe, Swiss Post.

Calendly Mobile on the App Store Calendly notifications screen

03 — Short-term contract · iOS

Calendly

Schedule in Real Time for the iPhone app. Calendar APIs and live sync, alongside Calendly’s own team.

Car:Go on the App Store: ride-hailing in Belgrade Car:Go pickup screen

04 — Full-time · Lead iOS

Car:Go

Ride-hailing in Belgrade. A full Swift rewrite, new networking, and the Car:Go Butler food-ordering feature.

Included Health on the App Store Included Health home screen

05 — Contract via Vicert · iOS

Included Health

Healthcare for patients and providers. Part of Vicert’s contract team, helping move the app from UIKit to SwiftUI after a merger.

Also built

Apps · own products · open source

  1. Habit tracking, rewards and personal goals, around a pet that grows with you.

  2. The native iPhone player for designing, testing and feeling haptic feedback.

  3. A high-school social network with mental-health resources, privacy and safety built in.

  4. A native Mac app for quick dictation and voice notes. Not released yet.

  5. InstrumentsMCP Xcode Instruments for AI agents Open source

(02)

Services

Design and code, no hand-off gap

iOS apps

  • SwiftUI & UIKit
  • Architecture
  • Backend & payments
  • Real-time features
  • Performance

Product design

  • Flows
  • Design systems
  • Prototypes
  • Interaction & motion

Websites

  • Art direction
  • Design
  • Front-end build
  • Motion
  • Launch & hosting

(03)

Process

Four steps, one current

  1. 01

    Listen

    One call. A written brief you sign off.

  2. 02

    Shape

    Designed in code, so you judge the real thing.

  3. 03

    Build

    Production code, tested where your audience is.

  4. 04

    Hand over

    Code, docs and tests. All yours.

(04) Contact

Let’s talk.

nemanja@nemanjavlahovic.com

Tell me what you’re making and when you need it.