100+

Startups backed by venture capital or at the pre-seed stage

These are pre-seed and VC-backed founders who came to us with an idea and nothing else. They left with something real users could open — on the timeline we quoted.

Trusted Partner for Startup App Development

We build web and mobile apps for startups, backed by a dedicated team of full-stack engineers and consultants. Here's what that's added up to so far.

100+Successfully launched startups

Clutch rating 4.9 out of 5 - client reviews.

25 Reviews on Clutch

400+Successfully completed projects

9Offices around the Globe

Our offices
Florida, USA
Miami - Headquarters
Poland
Wrocław
Lithuania
Vilnius
Germany
Heidelberg
Map of Emerline’s global office locations: USA, UK, Germany, Poland, Lithuania, Georgia.

App Development Services for Startups

Startups reach us at different points. Some have a deck and no code, some have a product that worked for the first thousand users and broke at ten thousand. Where you start changes what we do first.

App Development Services for Startups

Idea discovery

Before anyone writes code, we work out what the first release has to prove. We go through the product idea, the users behind it, and the business case, then cut scope to what actually has to ship. You leave discovery with a spec and an estimate you can take to a board.

PoC development

When the risk sits in the technology rather than the market, a proof of concept answers the question cheaply. Can the model hit the accuracy your pricing depends on? Will that integration hold under load? Three weeks to find out beats month five.

MVP development

The first version users pay for. MVP work covers one primary platform, the core product loop, payments, and analytics, scoped to a fixed 10 to 15 week build. Fixed bid, because a company with a runway needs a number that holds.

Prototyping and UI/UX

Designers join at the start, not after the backend is done. Interactive prototypes go in front of real users while changes still cost hours instead of sprints, and design thinking sessions settle arguments about the product before they turn into rework.

Product scaling

Growth breaks what worked at launch. We rework architecture under load, keep infrastructure costs from outrunning revenue, and drive performance work from what monitoring actually shows rather than from guesses about where the bottleneck is.

Software and technology consulting

Sometimes the question is not what to build but whether to. Our consultants go through the business case, the technical approach, and the stack, and tell you what we would do with your money if it were ours.

Our Hands-on Expertise in App Development for Startups

all case studies
SquareDash: From an Off-the-Shelf MVP to a Live Fintech Platform in 14 Months

SquareDash: From an Off-the-Shelf MVP to a Live Fintech Platform in 14 Months

Solution category

Custom Platform

Country

USA

Industry

Fintech

A veteran-founded startup validated demand with an off-the-shelf MVP. We built the payments and cash-advance platform from scratch — now live, serving contractors across the US.
Midday: An iOS App for a Seed-Stage Femtech Startup, Built with Mayo Clinic

Midday: An iOS App for a Seed-Stage Femtech Startup, Built with Mayo Clinic

Solution category

Mobile application

Country

USA

Industry

Healthcare

Our client had a website and an idea for iOS. We built the app from scratch — symptom tracking, menopause stage detection, Fitbit and Apple Pay. It launched alongside the company's $2.5M Radical Ventures seed round.
6-8 Sports: Scaling a Water Polo Analytics App Founded by Two Olympians

6-8 Sports: Scaling a Water Polo Analytics App Founded by Two Olympians

Two Olympic medalists had an iOS app and a scoring desk that could not keep up. We rebuilt both for real-time stats across simultaneous games, and still run the product. The app has passed 30,000 App Store views.
Hello Ralphie: White-Label Telemedicine for a Seed-Funded Vet Startup

Hello Ralphie: White-Label Telemedicine for a Seed-Funded Vet Startup

A seed-funded vet telehealth startup had an iOS app and wanted a web platform it could resell. We built white-label pages and moved payments to Square and video to Agora, turning one product into a reseller channel.

Every startup project starts with a real conversation, not a sales script. Tell us where you're stuck.

What Fits Into 10–15 Weeks

Every agency quotes a timeline, few say what they mean by it. Ten to fifteen weeks gets you a working product in the hands of real users on one primary platform — not a clickable prototype, not a demo that breaks outside the happy path.

Core build (10–15 weeks)

Everything needed to put the product in an app store, charge money through it, and show investors real usage data.

Deliverables:

  • One primary platform: iOS, Android, or web
  • Sign-up, authentication, and user roles
  • The core product loop, built to extend
  • Admin panel your team runs without calling us
  • One payment provider, live and tested
  • Event tracking, deployment, error monitoring
  • App store submission and review handling

Scoped separately (planned in discovery)

Three things push a build toward fifteen weeks rather than ten: a second platform, an integration we do not control, and a decision-maker who misses sprint reviews. The third costs the most.

Planned separately:

  • A second native platform built in parallel
  • Compliance certification: HIPAA, SOC 2, PCI DSS
  • Integrations on someone else's release schedule
  • Back-office reporting beyond basic exports
  • Secondary features that each cost a sprint

What We Build On, and Why

Founders get told a stack and rarely told the reasoning. Ours is boring on purpose: fewer moving parts, more engineers who can pick it up when you hire, and no architecture decision that only makes sense while we are the ones maintaining it.

Mobile

React Native or Flutter covers most products. One codebase, both stores, roughly half the mobile budget. We go native — Swift, Kotlin — when the product leans on the device itself: camera pipelines, background location, Bluetooth hardware, AR. Choosing native early because it sounds more serious is how seed money disappears.

Backend

Node.js and Python handle most of what startups need, with .NET or Java where an enterprise buyer or an existing system makes that the sensible call. PostgreSQL by default. A managed database, not one we run for you.

Infrastructure

Cloud from day one on AWS, Azure, or Google Cloud, in your account with your billing. Deployment is automated before the first release, because manual deploys are how a Friday turns into a weekend.

AI, where it earns a place

AI features belong in an MVP when they carry the core value — document extraction, search over your own data, generative output that users came for. They do not belong there as a badge. We will build either, but only one of them will change your retention curve.

Our Collaboration Models

Most startups move through these three models in that order, not because we push them there, but because the right pricing model changes as the risk does.

Fixed bid: discovery through MVP

Scope is locked before work starts, so the number in your board deck stays the number you pay. This is how we run idea discovery, PoC, and MVP work — the stages where an open-ended budget is the last thing a runway needs.

Staff augmentation: filling a specific gap

A missing skill is a different problem than missing scope. Nobody on your team has shipped a payments integration before, or your one mobile engineer just quit, and the work can't wait for a hire. Our specialists join your repo and your standups for as long as the gap exists, and not a day longer.

Dedicated team: after the MVP proves out

Once the question changes from "does this work" to "can this handle ten times the load," you need a team sized to that, not to the original MVP scope. We staff up and down as your usage curve moves.

From Idea to Delivery With Emerline

Five stages, each with something concrete you can hold before moving to the next.

STEP 1

Discovery & market research

  • We map the problem, the user, and where your app fits against what's already out there — not a SWOT slide, a working view of who you're competing with for attention.
  • A short feasibility pass flags the parts of the idea that are technically or financially risky, before either gets spent building them.
  • You get this in writing: a one-page problem statement you can hand to a co-founder without re-explaining it out loud.
STEP 2

Planning & strategy

  • The idea from Step 1 becomes a scoped roadmap: what ships first, what's deliberately cut, and why.
  • Budget, team composition, and tech stack get decided here, not discovered mid-build.
  • You leave with a fixed-bid estimate tied to specific milestones and dates, not a range.
STEP 3

UX/UI design & prototyping

  • Wireframes settle the user flow before a single screen gets styled — the cheap place to change your mind.
  • UI reflects your brand, built by designers who sit in the same standups as the engineers who implement it.
  • A clickable prototype goes in front of real users here — the point where changing your mind is cheap, not the point where it blows the sprint.
STEP 4

Development & testing

  • Engineers work in short cycles with visible output, so what you see between check-ins is working software, not a status update.
  • QA runs alongside development, not after it: functional, performance, and security testing happen on features as they ship.
  • If something turns out harder or easier than scoped, you hear it inside the sprint it happens in, not at the next monthly call.
STEP 5

Launch & handover

  • We prepare the build, the store listings, and the privacy disclosures, and handle review rejections when they happen — routine on a first submission.
  • Monitoring and error tracking go live before launch day, not after something breaks.
  • What comes next is your call: staff augmentation if you're hiring, a dedicated team if you're scaling, or a full handover if your team is ready to take it from here.

Free consultation, no commitment. We'll tell you honestly whether your timeline is realistic before you spend a dollar building it.

More for Startups

App development is one part of what we do for early-stage companies. The rest of the startup practice sits here.

Mobile apps

iOS, Android, and cross-platform builds, including products that are mobile-first rather than mobile-also.

Web applications

Browser-based products where the app is the whole business, not a companion to something else.

Progressive web apps

When you want app behaviour without the store, the review cycle, or the install step

Startup development services

The full picture: discovery, PoC, MVP, scale-up, and the engagement models behind them.

Web design for startups

The marketing site investors and first users land on, built alongside the product rather than after it.

Support and maintenance

Security patches, dependency updates, and the monitoring that flags a problem before your users do.

Why Choose Us?

Every dev shop says they're different. Here's what we can actually back up.

Fixed-bid, scoped before you sign

MVP work is priced against a locked spec, not billed by the hour. The number you get in week one is the number you pay at launch.

ISO-certified, Microsoft Solutions Partner

Our process runs under ISO 27001, 9001, 22301, and 55001, and we hold Microsoft Solutions Partner status. For a healthcare or fintech founder facing investor due diligence, that's paperwork you don't have to build from scratch.

Direct access to your engineers

You're in Slack and sprint reviews with the people writing your code. Questions get answered same day, without going through an account manager first.

US and EU hours, genuinely overlapping

Offices in Miami, Mountain View, and King of Prussia sit alongside teams in Poland, Lithuania, and Germany. You get a real working overlap, not one side always on a call at midnight.

Built to hand off

The goal is a product your own team — or your next hire — can run without us in the room. We plan for that from the first sprint.

A track record you can check

25 reviews and a 4.9 rating on Clutch, from founders you can look up by name. We'd rather you read what past clients said than take our word for it.

What Our Clients Say

We share progress every iteration, not just at launch, so nothing in the finished build is a surprise. Here's what clients say about working with us that way.

4.9

25 Reviews on Clutch

25 Reviews on Clutch

The individuals we work with aren't just contractors, they are an important part of our strategic Team and we enjoy working with them every day!

Tracy B. Neal, President/CEO, CPG Data
Tracy B. Neal

President/CEO, CPG Data

Emerline has been the best development partner we’ve ever worked with!

Michael Lynch, CEO, Praxie
Michael Lynch

CEO, Praxie

We recommend Emerline as a trusted technology partner for developing telemedicine solutions and would choose to work with Emerline again regarding new projects.

Felicity Johnson, Founder, Hello Ralphie
Felicity Johnson

Founder, Hello Ralphie

Emerline provided us with the scaling we needed to grow our development capabilities from early-stage POC to now a globally deployed platform in the HR Tech space.

Alex Shubat, CEO, Espresa
Alex Shubat

CEO, Espresa

We highly recommend Emerline as a technology partner for large and complicated development projects that also delivers continuous cooperation with the provider on new projects.

Dr. Andreas Schwarzer, VP Global IT, FUCHS Group
Dr. Andreas Schwarzer

VP Global IT, FUCHS Group

Emerline helped us build an MVP into a full-fledged production platform — in 14 months

Matt Fruge, Founder and CEO, SquareDash
Matt Fruge

Founder and CEO, SquareDash

Throughout our cooperation with Emerline, they proved themselves reliable technology partners.

Renny Joy, IT Director, DRiV
Renny Joy

IT Director

Emerline exceeded expectations with organized, forward-thinking, and committed teamwork. We’re proud of what we built together!

Rodrick Miller, President & CEO, Miami-Dade Beacon Council
Rodrick Miller

President & CEO, Miami-Dade Beacon Council

The team gladly brought their expertise and delivered us a perfect solution to meet our customers’ business needs.

Christian Callender-Easby, Founder & CEO, Kontango
Christian Callender-Easby

Founder & CEO, Kontango

We recommend Emerline as a reliable and skilled tech partner

Dr. Yelena Yesha, Key Partner and Project Leader, FastFormulator
Dr. Yelena Yesha

FastFormulator Key Partner and Project Leader

They consistently delivered items on time, highlighting their commitment to timeliness and organization.

Natalie Boll, CEO, Founder of Tribela GmbH
Natalie Boll

CEO, Founder of Tribela GmbH

The level of skill and quality of the developers is outstanding!

Robert Gill, Director, RedWrasse Ltd.
Robert Gill

Director, RedWrasse Ltd.

It was noteworthy to highlight the friendly and customer-oriented processes used for product development.

Raphaël Briner, CEO & Founder, Visible
Raphaël Briner

CEO & Founder, Visible

My experience with Emerline has been great. I highly recommend them to anyone looking for a reliable partner who delivers on time and on budget.

Jesse Sprague, CEO, Echospectra
Jesse Sprague

CEO, Echospectra

Emerline has enhanced our software to become an indispensable tool for all our staff.

Business Director, 3QC, Inc.
3QC

Business Director, 3QC, Inc.

Awards and Recognitions

None of these badges get you a working app. What they tell you is that other founders vouched for us before you did — which is worth more than anything we could write about ourselves.

view all awards
Emerline awards
97 awards
Top App Development Company 2026
Top App Development Company 2026
Top Software Development Company 2026
Top Software Development Company 2026
Top Software Development Company for Startups 2025
Top Software Development Company for Startups 2025
Top Software Development Company 2025
Top Software Development Company 2025
Best Software Development Company in Miami 2025
Best Software Development Company in Miami 2025
Top Mobile App Development Firm 2025
Top Mobile App Development Firm 2025

Frequently Asked Questions About App Development Services for Startups

These are the questions we hear most on first calls with founders. If yours isn't here, ask it — we'll give you a straight answer, not a sales pitch.