Custom iOS & Android App Development
Native apps engineered around how your business actually runs. Nothing templated, nothing white-labelled, architected from scratch for throughput, hardware access, and security.
As a leading mobile app development company in New York City, we design, build, and rescue custom applications for startups, mid-market firms, and enterprises across the Tri-State area. Whether that means a hardened financial platform for a firm downtown or a high-throughput consumer product out of Silicon Alley, our in-house engineering team builds software that holds up when the stakes are real.
30 Minutes | No Obligation
As one of the top mobile app development firms in New York, we’re recognised across the industry for the work we deliver.
New York does not really have one economy. It has several running at full speed simultaneously, and each of them breaks software in a different way. A trading firm downtown cannot tolerate a half-second of lag. That is not a user experience complaint; it is a financial one. A media company on Madison Avenue needs an app that absorbs a traffic spike the moment a campaign goes live, without warning and without a ramp. A logistics team routing freight through JFK and Newark needs something that keeps working when the connection does not.
Most software gets built for one of those worlds and then stretched to fit the others. That is usually where it starts to fail: the fintech app that cannot survive a compliance audit, the retail app that folds under a sale-day spike, the healthcare app that was never actually designed around HIPAA in the first place. As experienced mobile app developers in NYC, we build for the world you are actually operating in rather than a generic version of it. From millisecond-sensitive trading systems to compliance-heavy healthcare platforms, it gets built like the failure matters. In New York, it usually does.
As one of the more technically focused app development companies in New York, we cover the arc from first scoping conversation through years of production support.
Native apps engineered around how your business actually runs. Nothing templated, nothing white-labelled, architected from scratch for throughput, hardware access, and security.
A tightly scoped first version delivered in 8 to 12 weeks, giving you something real to put in front of early users or investors rather than a prototype that breaks on demo day.
Platforms built for large, distributed workforces, integrating directly with the ERPs, CRMs, and internal databases already running your operation, with role-based access enforced throughout.
Aging codebases cost money and drive users away. We migrate to Swift, Kotlin, or React Native in phases, keeping the existing app in production until the replacement is genuinely ready.
Missed deadlines, broken builds, a vendor who stopped replying. We audit what exists, lock down the infrastructure, and rebuild a launch path that is actually achievable.
Launch is the start. SLA-backed support, continuous monitoring, OS compatibility work, and ongoing feature development so the app does not quietly decay.
AI Engineering
Most AI in mobile apps is a support chatbot in a costume. In New York, the applications that matter are quieter and more consequential: a fraud signal that fires before a transaction settles, a compliance check running inside the trade workflow instead of after it, a model that reads a fifty-page document faster than an analyst can open it.
Active pipeline
Language models connected to your internal documents, filings, and support history, with the retrieval layer and access controls a regulated firm needs before legal will approve deployment.
Real-time transaction scoring built for platforms where a false positive costs a customer and a false negative costs considerably more than that.
Extraction and classification across contracts, filings, claims, and onboarding packets, trained on your document formats rather than a generic model guessing at them.
Customer and internal-facing agents that absorb first-line volume and escalate cleanly, with reasoning logged for anyone who later asks how a decision was reached.
Models for demand, churn, and risk exposure, surfaced inside the product rather than in a separate reporting tool nobody opens.
Decision logging, explainability, and audit trails. Increasingly a procurement requirement in New York financial services before anything gets signed.
From a sub-second trading interface downtown to a freight tracker running through a dead zone on the way to Newark, everything below is built by the same in-house team.
Here is the pattern most buyers have already lived through. Senior architects run the pitch and answer every hard question well. The contract gets signed. Delivery moves to a group you have never spoken to, often in a time zone eight hours away, and the first month goes into explaining your business again to people who were not in any of the original conversations.
We do not operate that way. The engineers who scope your build are the ones who write it and ship it.
Whoever sits in your requirements sessions is whoever commits the code. No introduction to a delivery team after signature.
The same group carries strategy, design, engineering, and post-launch work, so nothing has to be explained twice.
Questions go to the people writing your app rather than through an account manager who relays them.
Plenty of New York buyers have sat through a “process” that turned out to be a slide. A clean diagram on a pitch call, abandoned the week after signature. Ours is not decorative.
Phase 01
We define what success means commercially before anything gets designed: who uses it, what it has to do, and which compliance regimes apply, whether that is SOC 2, HIPAA, PCI DSS, or NYDFS Part 500 for a covered financial entity.
For trading, media, and commerce products, acceptable latency and peak-load behaviour are decided here as hard numbers, not discovered during QA.
You leave with a technical blueprint, a backlog prioritised by commercial impact rather than build convenience, and a timeline we will be held to.
Phase 02
Clickable wireframes and high-fidelity screens tested with real users before production code exists.
Backend infrastructure, schema, and every third-party dependency mapped before anything is built on top of them.
Encryption, key handling, authentication, and access control designed in at this stage, because retrofitting them before an audit is where budgets go to die.
Phase 03
Two-week cycles ending in a build you can install and use. Not a progress summary, an actual artefact.
Automated and manual testing across physical iOS and Android hardware, plus load testing for anything expecting traffic spikes.
We handle Apple and Google reviews, including whatever the reviewers come back with, then track crash analytics, patch, and plan the next phase from real usage data.
The languages, frameworks, cloud platforms and data tools our engineers work in every day.
Complexity, backend architecture, and regulatory scope drive the number. We publish ranges upfront so you can set a budget before spending an hour on discovery calls.
15,000 USD to 25,000 USD
For startups validating a new product. Core functionality, standard UI, and the backend integrations needed to reach early users or investors.
Timeline: 8 to 12 Weeks
25,000 USD to 120,000 USD
For companies that need something feature-complete. Custom UI/UX, cross-platform reach, advanced integrations, and a secure admin layer.
Timeline: 4 to 6 Months
120,000+ USD
Highly secure applications with complex legacy integration, offline sync, full compliance adherence, and architecture built for sustained load.
Timeline: 8+ Months
A technical PM assigned at kickoff who reads the code review comments, understands your latency budget or your compliance scope, and can answer a question without scheduling a follow-up. They stay through post-launch support. No reintroduction at month four.
Defined builds with a clear endpoint and a number agreed before work starts.
A squad ring-fenced to your product, working on nothing else.
Our people inside your standups, your repo, and your tooling.
NYDFS Part 500 applies to covered financial entities and is the requirement most out-of-state vendors have never encountered. We handle it alongside SOC 2, HIPAA, PCI DSS, the New York SHIELD Act, GDPR, and the EU AI Act where your users sit outside the US. Audit documentation is produced as the build progresses rather than assembled in a panic beforehand.
Every architectural decision traces back to something you named at kickoff. We are not processing a feature backlog; we are solving whatever made you start looking for a mobile app developer in New York.
Modular systems on AWS, Azure, and Google Cloud, so a traffic surge or a new product line does not trigger starting over.
Our own developers, with coding standards and peer review on every sprint rather than a quality pass bolted on at the end.
For trading, media, and commerce products, latency and load targets are set in discovery and tested against, not discovered when something falls over.
Structured sprints, bi-weekly demos, and shared visibility on budget and progress, so you are never chasing an answer about where things stand.
Encryption, access control, and OWASP practices designed into the architecture from the first sprint rather than retrofitted before a review.
Sectors We Build For
As one of the leading app development companies in New York, our technical experience spans the sectors this city runs on.
Discuss Your ProjectProven Results
Reference builds showing our approach to recurring problems across New York’s core sectors. Client engagements under NDA are described by problem rather than by name.
Case studies
Case Study 01 Finance
Low-Latency Mobile Trading App
Finance
Case Study 02 Media & AdTech
Real-Time Campaign Monitoring App
Media & AdTech
Case Study 03 Logistics
Freight Tracking App
Logistics
Security and regulatory compliance are built into every phase of the build, so your software stays aligned with the standards your industry demands.
Our engineers maintain up-to-date cloud and engineering certifications, keeping your projects on modern, well-supported platforms.
Recognised across the industry for dependable delivery, measurable client outcomes, and long-term engineering partnerships.
Built for the Way New York Actually Operates
Whether it is a platform that has outgrown itself, a build stalled halfway, or an idea that needs a team to actually ship it, start with a conversation.
A senior engineer, not a salesperson, comes back within one business day with an honest read on scope, approach, and whether we are the right fit for it.
Common Questions
Most projects fall between $15,000 for a lean MVP and $120,000 or more for enterprise-scale platforms. Compliance scope and latency requirements account for most of the difference.
Finance and healthcare clients here carry heavier compliance obligations, and trading or media products carry performance requirements that add real engineering time. Neither depends on where the team sits.
An MVP built around your core feature set typically launches in 8 to 12 weeks, which is enough to demonstrate a working product rather than a prototype.
It varies with scope, but access control, encryption, multi-factor authentication, and incident reporting all need building and documenting properly. We scope it explicitly rather than folding it into a general line item.
Senior engineers stay on your project from the first scoping call through post-launch support, and you get a technical project manager from day one rather than an account manager with a status template.
Both. Fundable first versions for early-stage founders in Silicon Alley, and phased modernisation for established Tri-State enterprises.
Ask whether the people pitching will be the ones building, what their compliance record looks like in your sector, and how they handle load testing before launch rather than after.
Often, yes. A local team is more likely to arrive already understanding NYDFS scope, unannounced campaign traffic patterns, or the connectivity realities of the JFK and Newark corridors.
Native in Swift and Kotlin for performance-sensitive products such as trading tools. React Native when speed to market matters more than raw performance.
Yes. We start with a technical audit to establish what is usable, flag security and stability issues, then build a plan to finish and launch it.
Cloud-native architecture designed to absorb sudden load, with load testing before launch. Media and commerce clients in particular need this designed in rather than discovered.
Yes, provided the data layer supports it. LLM integration, fraud scoring, document processing, and conversational interfaces can all be added to an existing product. We audit the foundation first and tell you honestly if it will not support the feature.
Yes, every time, before any specifics are shared.
You do, entirely. Code sits in your repository from the first commit, and full ownership of architecture and design assets is yours.
It is the New York Department of Financial Services cybersecurity regulation covering entities licensed or authorised under state banking, insurance, and financial services law. If you are a covered entity, it imposes specific requirements on access control, encryption, multi-factor authentication, and incident reporting. We scope it during discovery.
It applies to any business holding private data on New York residents, regardless of where the business is based, and requires reasonable safeguards for that data. It is broader than NYDFS and catches companies that assume they are out of scope.