Quillstack.

Software
Engineer

Quillstack is an independent engineering studio in New York. We take products from first sketch to launch day: mobile apps, web platforms and on-chain features, shipped on a predictable schedule.

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Freelance software engineer working at a laptop
  • React Native
  • Vue.js
  • Blockchain
Quillstack Dev Studio | Freelance Software Engineer in New York

Idea to launch, without the drama. We build tidy, dependable software — mobile apps, web platforms and online stores — that ships quickly and keeps working as your audience grows.

What I Do

Four ways to work together, from the first architecture sketch to a release in the stores.

Phone, laptop and tablet on a workspace desk

Mobile App Development

Cross-platform mobile apps for iOS and Android, taken from prototype through store review and into steady, well-monitored releases.

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React Native iOS & Android App Store Launch Performance Tuning
Computer screen showing web design work in a studio

Full-Stack Web Development

Fast, accessible web platforms and portals — front end, APIs and databases engineered as one coherent system, deployed and monitored.

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Vue.js Node.js & APIs Web Portals Cloud Deployments
Server rack with cabling in a data center

Cloud & Deployment

Cloud infrastructure, CI/CD pipelines and zero-downtime releases — so every deploy is boring, safe and reversible.

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AWS CI/CD Pipelines Docker Monitoring
Bitcoin and Ethereum coins on a dark surface

E-Commerce & Blockchain

Storefronts, checkout flows and on-chain features — secure payments, smart contracts and wallets integrated with real products.

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Storefronts Smart Contracts Wallets Security Audits

Tech Stack

The languages, frameworks and infrastructure I reach for most often.

React Native
Vue.js
Node.js
MongoDB
AWS
Docker

Selected Works

A few recent products, from first commit to launch day.
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Developer building the Tempo fitness app

Tempo

Mobile App Development
React Native2024
Team collaborating on the StudyLoop learning platform

StudyLoop

Web Platform Development
Vue.js2026
Developers working on the CareBridge health platform

CareBridge

Web Platform Development
Vue.js · MongoDB2024
Design session for the ReLoop sustainability platform

ReLoop

Product & Technology Leadership
System Architecture2026

What People Say

Kind words from the founders and teams behind the products we have built.

Portrait of Helen Marsh
Helen MarshFounder & CEO, ReLoop

"Quillstack's early design decisions spared us a painful rewrite when ReLoop's user base tripled."

Portrait of Yuki Tanaka
Yuki TanakaProduct Manager, Northbeam

"Rare to find an engineer who obsesses over both the codebase and how the product feels in a customer's hands."

Portrait of David Osei
David OseiCo-Founder, Shopline

"New features landed every sprint and nothing that already worked ever regressed."

"The app he built for us is still live two years later and well rated in both app stores."
Farah RahmanOperations Lead at Northbeam
Engineer working across multiple screens in a studio at night
Portrait of George Mensah
George MensahE-Commerce Client

"A tangled legacy codebase cleaned up piece by piece, with no outage for our shoppers."

Portrait of Anita Desai
Anita DesaiProject Stakeholder

"Careful, thoroughly documented work, with security treated as a core requirement on our wallet integration."

Portrait of Lucia Fernandez
Lucia FernandezProgram Director

"He took a vague brief and turned it into a dependable internal tool our whole team now uses daily."

FAQ

Straight answers to the questions new clients ask most before we start working together.

Quillstack Dev Studio is an independent software practice in New York City. We build mobile apps, web platforms and blockchain integrations for startups and small teams.

React Native and Vue.js on the front end, Node.js and MongoDB on the back end, plus AWS, Docker and modern smart-contract tooling for blockchain work.

Yes — both short freelance engagements and longer embedded contracts. Monthly plans cover ongoing design and engineering, while fixed scopes work for one-off launches.

Fitness, education, healthcare, sustainability and e-commerce — from early MVPs to production platforms serving real customers every day.

Years of production experience across mobile and web: system architecture, App Store launches, cloud deployments and security-conscious blockchain integrations.

Send a message through the contact form below with your goals and timeline — you will usually get a reply within one business day.

Flexible Plans

Simple monthly retainers or fixed-scope projects, whichever suits the stage you are at.

Starter Plan

A focused engineering retainer for MVPs, prototypes and small feature work. Ideal for validating an idea and getting to market quickly.

$1,500 / month

  • One production-ready web or mobile feature set
  • Technical scoping and architecture notes
  • Clickable prototype or API sketch
  • Admin panel or CMS integration
  • Responsive, accessible build
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Professional Plan

A fuller engagement for established businesses that need a product built, hardened and scaled.

$3,000 / month

  • Web and mobile builds from one codebase
  • Full system architecture
  • Staging environment and CI/CD pipeline
  • Custom-coded admin tools
  • Performance and security review
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Contact

Got a product to build or a system to rescue? Tell us what you need and we will reply within one business day.

LocationNew York, NY