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MOBILE APP DESIGN SERVICES

Mobile App Design Services Built to Platform Conventions Users Already Know

Designed to the platform conventions users already know — iOS Human Interface Guidelines, Android Material Design — and delivered as a real, documented component system engineering can actually build from.

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In short: Northell's mobile app design follows platform conventions (HIG/Material Design) and delivers a handoff-ready component system, not just static screens.
CAPABILITIES

What Mobile App Design Covers

Platform-Native UI Design

Designed against iOS HIG and Android Material Design where they genuinely diverge, not a generic cross-platform look.

Interactive Prototyping

Real, clickable prototypes tested with users before engineering builds against the design.

Component System Delivery

A documented, handoff-ready Figma component system, not a folder of disconnected static screens.

Usability Testing

Prototypes tested with real or representative users while issues are still cheap to fix.

FIT CHECK

Built for Specific Buyers, Not Everyone

Founders With an App Idea, No Design Yet

Need a real design partner before any engineering work starts.

Teams With an Engineering Partner, No Designer

Have a development team ready to build but need handoff-ready design first.

Products Redesigning an Existing App

The current app works but the design has aged past what users expect now.

If you already have a mature, documented design system and just need one new flow designed, a smaller-scoped engagement will likely serve you better than a full design engagement.

PROCESS

From Kickoff to Launch

01

Research & IA

User needs and information architecture mapped before any screen gets drawn.

→ IA map + user flows
02

Wireframes & Prototyping

Low-fidelity wireframes into interactive, clickable prototypes.

→ Interactive prototype
03

Usability Testing

Real or representative users test the prototype before visual design is finalized.

→ Usability findings + revisions
04

Visual Design & Handoff

Final visual design delivered as a documented, handoff-ready component system.

→ Handoff-ready Figma system
STACK

Technologies We Use

Design Tools
FigmaFigJam
Testing
MazeUserTesting
Platform Systems
iOS HIGMaterial Design
Handoff
Figma Dev ModeDesign tokens
155+ product builds shipped
22% conversion on new-build designs, per our published design-team data
TODO average design engagement timeline
FAQ

Common Questions About Mobile App Design

Do you design separately for iOS and Android?

We design against each platform's real conventions (Human Interface Guidelines for iOS, Material Design for Android) where they diverge meaningfully, while sharing the core information architecture and flows.

What do we actually receive at the end?

A documented, handoff-ready component system in Figma — not a folder of static screens engineering has to reverse-engineer into components.

Do you test the design before development starts?

Yes — interactive prototypes get tested with real or representative users before engineering builds against the design, so usability issues surface while they're still cheap to fix.

Can you design for an app you're not also building?

Yes — design-only engagements are common, with a handoff-ready deliverable your engineering team (internal or another vendor) can build from directly.

How long does mobile app design take?

A focused app design typically runs 4-8 weeks depending on screen count and complexity, including a usability testing round.

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