Fullstack Web & App Development Services

We design, build, and scale modern digital products from early MVPs to complex platforms. Since 2015, we’ve supported US and EU companies with a team of 100+ experienced engineers.

Fullstack Web & App Development Services
Optilyz
Buzz Stream
Echelon
Everphone
Fatty15
Flaus
Intentsify
Lucchese
Win
eCatholic
Optilyz
Buzz Stream
Echelon
Everphone
Fatty15
Flaus
Intentsify
Lucchese
Win
eCatholic
Optilyz
Buzz Stream
Echelon
Everphone
Fatty15
Flaus
Intentsify
Lucchese
Win
eCatholic
Abilitie
Dorling Kindersley
Rasa
Fracture
Revival
1rockwell
Humann Fit
zenefits
Abilitie
Dorling Kindersley
Rasa
Fracture
Revival
1rockwell
Humann Fit
zenefits
Abilitie
Dorling Kindersley
Rasa
Fracture
Revival
1rockwell
Humann Fit
zenefits

Fullstack Development & Product Engineering

We help companies turn product ideas into digital solutions that scale and grow. From MVP development to complex platforms, our Fullstack Engineers cover the entire product lifecycle: architecture, development, integrations, and optimization.

We work end-to-end or step in where you need us most: frontend, backend, integrations, or the full stack.

fullstack team
Custom Web & App Development
  • Building applications from the ground up
  • MVP development for startups and new products
  • Scalable web platforms and SaaS products
  • Cross-platform app development
Frontend Engineering
  • Modern frontend frameworks (React, Vue, and more)
  • Responsive interfaces and UX-focused architecture
  • Performance optimization and accessibility improvements
Backend Engineering
  • API development and microservices architecture
  • Database design and backend logic
  • Secure authentication and scalable infrastructure
Integrations & Product Ecosystems
  • Third-party API integrations (including e-commerce, e.g. Shopify with custom ERP)
  • Payment systems and external services
  • Data pipelines and analytics integrations
  • ETL pipeline development for reliable data flow between systems
Product Scaling & Optimization
  • Refactoring and improving existing applications
  • Performance optimization and codebase improvements
  • Preparing products for growth and increased traffic

We’re your best choice
– backed by data

Our Fullstack Engineers are your best choice. Here's what makes us so confident:

98%

of our projects come from client referrals

5.0

star rating on Clutch

Expertise in modern web & app development,
from MVPs to complex platforms

2015

Proven track record with US and EU product
companies since 2015

Transparent communication and flexible
collaboration models

Know-how across the full stack, frontend,
backend, integrations, and infrastructure

98% Referral, 2% Lucky Finds

Lenny dialog
From Poland wth Dev team in mountains
From Poland wth Dev team in mountains

98% Referral, 2% Lucky Finds

Strong partnerships start with great people. That’s why we work with companies we believe in. We focus on thoughtful growth through quality work. Happy customers spread the word, bringing in like-minded partners. Though if you found us by chance, be like Lenny – say hi if it feels right! 😊

Choose your model

We offer flexible payment options: fixed price, time & materials, dedicated team or on-demand, so you can pick the setup that fits your project and workflow best.

Best if
you’re looking for
long-term FTE & part-time roles
Team Extension
Need to scale your team efficiently? We’ll match you with experts who fit your stack and your culture.
Best if
you have a backlog of tasks
and need steady care
Monthly Retainer
Consistent support with a set monthly budget. You get guaranteed dev time and reliable progress, each month.
Best if
you have a project to
be taken care of from A to Z
End-to-End
You get a dedicated team that turns your idea into a product. We lead the build so you can focus on the big picture.
Best if
you need support for
one-off changes without commitment
On-demand & Maintenance
Have something small or unpredictable? Our experts will handle updates, fixes and changes.

We’re a perfect match if you
want to…

  • Turn a product idea into a working MVP quickly
  • Scale your app to 1000+ of users
  • Improve your platform architecture to enable more product growth
  • Hire experienced engineers to support your internal team
  • Implement complex integrations of your product with external systems

…and more – let’s talk about your needs!

fullstack developer

Project Spotlight

Fintech application platform

Fintech application platform designed as an employee financial wellness benefit.

Rolan case study

Key Impact:

  • Plaid integration enabling secure, real-time connection to users' bank accounts and transaction data
  • Rule-based financial insights engine with an AI-powered recommendations layer on the roadmap

Scope of Work:

  • Development of a fintech application platform for the US market
  • Backend and frontend development
  • Integration with Plaid for bank account connectivity and transaction data sync
  • Financial insights and data visualisation based on transaction analysis
  • Goal setting and progress tracking across different financial targets
  • CFP consultation flow: in-app chat, financial plan access, and secure data sharing with the advisor
  • Employer-side dashboard with aggregate workforce financial statistics
  • Pre-launch testing and pilot preparation

Project Spotlight

AI-Powered Sports
Recruitment Platform

Sports technology platform for baseball player recruitment and team management.

AI-Powered Sports
Recruitment Platform

Key Impact:

  • AI-powered natural language player search across unified multi-source data
  • Adaptive API integration handling both GraphQL and REST through custom codegen

Scope of Work:

  • Fullstack development across two application modules
  • Recruitment platform: ETL pipeline aggregating player data from multiple sources into a unified format, AI-powered natural language search engine
  • Team management app: React frontend for coaches, live and in active use
  • Custom codegen layer bridging third-party API formats (GraphQL and REST)
  • Scalable application architecture and integrations
Our Tech Stack & Expertise
React / Next.js, TypeScript / JavaScript, GraphQL / REST API, Performance optimization & Core Web Vitals
react js logo
React
next js logo
Next JS
javascript logo
JavaScript
node js logo
Node JS
graphQL logo
GraphQL
postgres sql logo
PostgresSQL
mongodb logo
MongoDB
aws logo
AWS
docker logo
Docker
Node.js (Express, Nest.js), PostgreSQL / MongoDB, GraphQL & REST API design
react js logo
React
next js logo
Next JS
javascript logo
JavaScript
node js logo
Node JS
graphQL logo
GraphQL
postgres sql logo
PostgresSQL
mongodb logo
MongoDB
aws logo
AWS
docker logo
Docker
AWS, Docker, CI/CD
react js logo
React
next js logo
Next JS
javascript logo
JavaScript
node js logo
Node JS
graphQL logo
GraphQL
postgres sql logo
PostgresSQL
mongodb logo
MongoDB
aws logo
AWS
docker logo
Docker
LLM integrations, AI-powered features & insights, RAG / Vector databases, ETL pipelines & data engineering
react js logo
React
next js logo
Next JS
javascript logo
JavaScript
node js logo
Node JS
graphQL logo
GraphQL
postgres sql logo
PostgresSQL
mongodb logo
MongoDB
aws logo
AWS
docker logo
Docker

Get to know us

Our software agency was established in 2015 by two cousins, Paweł and Marcin. What started out as a team of 5 quickly scaled to 100+ people across technologies and locations on a mission to shift the mentality of outsourcing tactical projects to Polish devs. We handpick clients and projects, which enables our team to create, design and implement complex solutions and softwares.

Meet Our Fullstack Experts

We're the brains and the heart behind the code. A quirky bunch of passionate pros who love turning ideas into reality. Here, every project is a team sport, and we’re all about building software - and relationships - that last, one line of code at a time.

Shopify team - Mariusz

Mariusz

Lead Fullstack Developer
avatar Adam

Adam

Tech Lead
avarat Konrad

Konrad

Fullstack Developer
avatar placeholder efpe

Kamil

Senior Mobile Developer
avatar Kamil

Kamil

QA Engineer
Piotr photo

Piotr

Senior Fullstack Developer
avatar Bartosz

Bartosz

Fullstack Developer
+12

awesome engineers

(and growing)

How we work

01
Let’s discuss your needs
We learn about your product vision, users, and technical requirements. Where needed, we run discovery sessions and workshops to map out the full picture together.
02
Technical specification
We define the scope, prepare a development roadmap, and design the architecture.
03
Select your collaboration model
From building an MVP to delivering a full-scale product or extending your engineering team, we adapt to your product stage and take full ownership of what we build.
04
Beyond development
We support product growth through optimization, new features, and infrastructure improvements.

Reviews

Quality is our specialty, retention is our metric

“We’ve recently become the #1 fastest growing supplement company in America (Inc. 5000). FPWD played a part in it by continually optimizing our websites.”
"I’ve worked with a lot of agencies in the past and had a lot of headaches – FPWD is not one of those."
“The resources they’ve recommended are all incredibly talented, smart, and good people.”
“They've created a lot of great assets and we've been very pleased with their work.”
“They’re very responsive and eager to help, so we’ve had a great collaboration with them so far.”
“They are invested in the work, and they want us to achieve our goals.”
“Their passion for the work they do is clear. They truly care about our company’s success.”
“The partnership has been working out great for the redesign and relaunch of our main site.”

We’d love
to hear from you

Got a question or need project advice? Reach out, we’d love to hear from you! Better yet, visit us at one of our offices or anywhere in Poland.

Thank you for reaching out! We'll get back to you shortly
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Contact Ala
Alicja Trzewik-Wantuła
Director of Client Relations

FAQ

If you have a question about our Fullstack Services, you’ll probably find an answer below. If not, feel free to contact us – we’ll be happy to clear things up for you.

What is fullstack development and what does it include?

Fullstack development covers the entire product build: from frontend interfaces and user experience to backend logic, databases, APIs, and infrastructure. A fullstack development team can own the full product lifecycle, from early architecture decisions through to launch and scaling.

What does a fullstack developer do on a product project?

A fullstack developer works across both the frontend and backend of an application, building interfaces, designing APIs, managing databases, and handling integrations. Our fullstack developers take full ownership of what they build, whether that's an MVP, a SaaS platform, or a complex web application.

What is the difference between a fullstack web developer and a specialist developer?

A fullstack web developer can work across the entire stack, making them ideal for products that need end-to-end ownership or fast iteration. Specialist developers go deep in one area, frontend or backend, and are best suited for larger teams or complex, domain-specific challenges. We offer both models depending on your product stage.

When should I hire fullstack developers rather than build an in-house team?

Hiring fullstack developers makes sense when you need to move fast, reduce overhead, or access a broad range of skills without the cost of assembling multiple specialists. It's particularly valuable for MVPs, scaling phases, or when your internal team needs experienced engineers to step in and take ownership.

Can you help us build an MVP from scratch using fullstack web development?

Yes, MVP development is one of our core services. We help you define scope, design the architecture, and build a working product efficiently. Our fullstack web development approach means one team covers frontend, backend, and integrations, keeping communication clean and timelines tight.

How do you handle complex integrations in fullstack projects?

We build integrations with third-party APIs, payment systems, ERP platforms, data pipelines, and more as a standard part of fullstack development. Projects like WIN Reality and Rolan Wealth involved custom integration layers, including ETL pipelines and Plaid connectivity, built to be reliable and scalable from day one.

What engagement models do you offer for fullstack development services?

We adapt to your needs: whether that's building a product end-to-end, extending your existing engineering team, or stepping in at a specific stage of development. Our fullstack developers integrate into your workflow and take full ownership of their scope.