Mikołaj Gramowski - Full-Stack App Developer
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Full-stack
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app developer
MIKOŁAJ GRAMOWSKI
SENIOR LEVEL
LOCATED IN POLAND
Kuyavian-Pomeranian Voivodeship
Kuyavian-Pomeranian Voivodeship
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ABOUT ME & MY EXPERIENCE
I'm a passionate full-stack developer with over 5 years of experience in crafting web applications. I specialize in React and Node.js, and I'm dedicated to creating seamless user experiences.
I have a strong track record of delivering end-to-end solutions, from AI-powered platforms and smart finance apps to complex marketplaces. My focus is always on writing clean, scalable code and building intuitive interfaces that drive real business value.
+ 5
Years of Experience in Software Development
All week
Available for Communication
+ 50
Clients and Projects Completed
CLIENT REVIEWS
Kind words
- [ Client rating ]
- 5.0
- [ On Upwork since ]
- 2021
- [ Job success ]
- 100%
[ Upwork ]
“Mikolaj had great knowledge on React Native and TypeScript besides having a strong view and execution on UX/UI. The mobile App was delivered as a MVP just as assigned. If you ever need a developer for iOS App Development and Android App Development, Mikolaj is your guy!”
[ Upwork ]
“Miko was fantastic to work with. He consistently went above and beyond, took real ownership of the project, and was always thoughtful, reliable, and highly skilled. I'd happily work with him again and strongly recommend him.”
[ Upwork ]
“Mikolaj is very detailed and organized. He knows stack well and is very neat and clean with laying out the infrastructure. He's flexible and handles network outages with care while implementing safe measures.”
[ Upwork ]
“Great guy, completed the implementation of my expo react app really well.”
[ Upwork ]
“He is very professional and delivered work on time. We are happy with his technical knowledge and speed of execution.”
[ Upwork ]
“Mikolaj executed our corporate app migration flawlessly under a tight launch schedule. Absolute professional engineer, Highly Recommended.”
[ Upwork ]
“Mikolaj had great knowledge on React Native and TypeScript besides having a strong view and execution on UX/UI. The mobile App was delivered as a MVP just as assigned. If you ever need a developer for iOS App Development and Android App Development, Mikolaj is your guy!”
[ Upwork ]
“Miko was fantastic to work with. He consistently went above and beyond, took real ownership of the project, and was always thoughtful, reliable, and highly skilled. I'd happily work with him again and strongly recommend him.”
[ Upwork ]
“Mikolaj is very detailed and organized. He knows stack well and is very neat and clean with laying out the infrastructure. He's flexible and handles network outages with care while implementing safe measures.”
[ Upwork ]
“Great guy, completed the implementation of my expo react app really well.”
[ Upwork ]
“He is very professional and delivered work on time. We are happy with his technical knowledge and speed of execution.”
[ Upwork ]
“Mikolaj executed our corporate app migration flawlessly under a tight launch schedule. Absolute professional engineer, Highly Recommended.”
[ Upwork ]
“Mikolaj had great knowledge on React Native and TypeScript besides having a strong view and execution on UX/UI. The mobile App was delivered as a MVP just as assigned. If you ever need a developer for iOS App Development and Android App Development, Mikolaj is your guy!”
[ Upwork ]
“Miko was fantastic to work with. He consistently went above and beyond, took real ownership of the project, and was always thoughtful, reliable, and highly skilled. I'd happily work with him again and strongly recommend him.”
[ Upwork ]
“Mikolaj is very detailed and organized. He knows stack well and is very neat and clean with laying out the infrastructure. He's flexible and handles network outages with care while implementing safe measures.”
[ Upwork ]
“Great guy, completed the implementation of my expo react app really well.”
[ Upwork ]
“He is very professional and delivered work on time. We are happy with his technical knowledge and speed of execution.”
[ Upwork ]
“Mikolaj executed our corporate app migration flawlessly under a tight launch schedule. Absolute professional engineer, Highly Recommended.”
[ Upwork ]
“Mikolaj had great knowledge on React Native and TypeScript besides having a strong view and execution on UX/UI. The mobile App was delivered as a MVP just as assigned. If you ever need a developer for iOS App Development and Android App Development, Mikolaj is your guy!”
[ Upwork ]
“Miko was fantastic to work with. He consistently went above and beyond, took real ownership of the project, and was always thoughtful, reliable, and highly skilled. I'd happily work with him again and strongly recommend him.”
[ Upwork ]
“Mikolaj is very detailed and organized. He knows stack well and is very neat and clean with laying out the infrastructure. He's flexible and handles network outages with care while implementing safe measures.”
[ Upwork ]
“Great guy, completed the implementation of my expo react app really well.”
[ Upwork ]
“He is very professional and delivered work on time. We are happy with his technical knowledge and speed of execution.”
[ Upwork ]
“Mikolaj executed our corporate app migration flawlessly under a tight launch schedule. Absolute professional engineer, Highly Recommended.”
[ Upwork ]
“Working with Mikolaj on Wellio has been one of the best decisions I've made for the app. … He's also incredibly hardworking: reliable, responsive, and genuinely invested in getting things right rather than just getting them done.”
[ Upwork ]
“Mikolaj was easy, flexible and communicative to work with. I was updated on the project from day 1 to finish. There were hurdles that he needed to deal with outside of his control. He did it gracefully.”
[ Upwork ]
“Great cooperation! Professional approach and solid code. I recommend!”
[ Upwork ]
“Did very good job. Thanks Mikolaj.”
[ Upwork ]
“He completed the task successfully, will work with him again!”
[ Upwork ]
“Working with Mikolaj on Wellio has been one of the best decisions I've made for the app. … He's also incredibly hardworking: reliable, responsive, and genuinely invested in getting things right rather than just getting them done.”
[ Upwork ]
“Mikolaj was easy, flexible and communicative to work with. I was updated on the project from day 1 to finish. There were hurdles that he needed to deal with outside of his control. He did it gracefully.”
[ Upwork ]
“Great cooperation! Professional approach and solid code. I recommend!”
[ Upwork ]
“Did very good job. Thanks Mikolaj.”
[ Upwork ]
“He completed the task successfully, will work with him again!”
[ Upwork ]
“Working with Mikolaj on Wellio has been one of the best decisions I've made for the app. … He's also incredibly hardworking: reliable, responsive, and genuinely invested in getting things right rather than just getting them done.”
[ Upwork ]
“Mikolaj was easy, flexible and communicative to work with. I was updated on the project from day 1 to finish. There were hurdles that he needed to deal with outside of his control. He did it gracefully.”
[ Upwork ]
“Great cooperation! Professional approach and solid code. I recommend!”
[ Upwork ]
“Did very good job. Thanks Mikolaj.”
[ Upwork ]
“He completed the task successfully, will work with him again!”
[ Upwork ]
“Working with Mikolaj on Wellio has been one of the best decisions I've made for the app. … He's also incredibly hardworking: reliable, responsive, and genuinely invested in getting things right rather than just getting them done.”
[ Upwork ]
“Mikolaj was easy, flexible and communicative to work with. I was updated on the project from day 1 to finish. There were hurdles that he needed to deal with outside of his control. He did it gracefully.”
[ Upwork ]
“Great cooperation! Professional approach and solid code. I recommend!”
[ Upwork ]
“Did very good job. Thanks Mikolaj.”
[ Upwork ]
“He completed the task successfully, will work with him again!”
Are you Looking for ...
AI Tools & Services
Marketplaces
Finance & Investment
PROJECTS (8)
Pinnio
React Native
Expo
Mapbox
Firebase
NestJS
TypeORM
MySQL
BullMQ
React Admin Panel
Pinnio is a location-based marketplace app for iOS and Android. Users drop a pin on the map for something they want to offer or find, guided by a conversational assistant that builds the listing step by step. An AI matching engine continuously pairs offers and requests within an adjustable radius using multilingual embeddings, a reranker and LLM verification, then connects the two sides in real-time chat with push notifications. I worked on it as a Full Stack Developer, across the React Native app, the NestJS API and the React admin panel.
Wellio (Self-Improvment)
React Native
TanStack
NestJS
Mongoose
OpenAI API
MongoDB
Expo UI
Wellio is an AI‑powered lifestyle and symptom tracking app designed to help users identify correlations between daily habits and how they feel. Users log health and lifestyle data (sleep, exercise, diet, mood, symptoms, etc.), and the app generates AI‑driven insights and correlations to support self‑awareness and better decision‑making. The product focuses on wellness tracking rather than medical advice.Key FeaturesDaily health and lifestyle logging with structured inputs and free‑form notesAI‑generated correlations and insights from user dataSecure account flow with social sign‑in optionsMobile‑first UX with onboarding, privacy/consent flows, and profile data captureSubscription support for premium featuresTech Stack
AI Grammar Assistant
AI
Swift
Mobile App
AI Grammar Assistant is your ultimate writing companion, designed to revolutionise the way you write. Whether drafting emails, essays, or social media posts, our advanced AI ensures your writing is clear and compelling. Features include spot-on corrections for grammar, style and tone enhancements, personalised learning based on your pattern, and real-time instant feedback. See our privacy policy: https://yuliana-bondireva.jimdosite.com/ and Terms: https://yuliana-bondireva.jimdosite.com/terms/
Deltaton
React Native
AI Platform
Mobile App
Deltaton is an advanced AI-powered platform designed to support farmers, growers, and agricultural professionals. It offers specialized agents to assist in managing crops, vineyards, greenhouses, or beehives with data-driven decisions. Includes a General Agent for agriculture basics and a Farm Agent for customized expert insights.
Artboard - Marketplace & Services for Artists
Next.js
NestJS
MongoDB
ArtBoard is a Polish online marketplace connecting artists with buyers, featuring artist profiles, artwork listings. It’s built with a Next.js 15 frontend and a NestJS + MongoDB backend, with TypeScript.
Intrend (AI Trend Analysis)
React Native
Gesture Handler
Reanimated
Lottie
React Native SVG
Firebase
MMKV
Secure Storage
Intrend is an AI-powered social media trend analysis app built with React Native. It tracks trending topics, aggregates engagement data, and provides predictive analytics. The app leverages gesture-driven interactive charts, fluid Reanimated transitions, and secure local caching using MMKV for a smooth, high-performance experience.
Piana - Smart Finance App
Flutter
Dart
FlutterFlow
Piana is a comprehensive finance and banking mobile app built with Flutter. It enables users to securely manage accounts, track transactions, set budgets, and access advanced financial analytics. I led the development, integrating Adyen API for seamless payment processing and designing an intuitive, user-friendly interface focused on security and usability.
iPad App & Web Dashboard System
React Native
Firebase
Expo.io
Figma
Created a hybrid iPad app using React Native and a web-based dashboard using React for a 3D printing business. Used Firebase for real-time data sync and authentication. Delivered smooth user flows and a responsive UI tailored for in-factory use. Helped digitize operations and reduce manual input errors.
Hiring an App Developer: FAQs & Cost Guide
How much does it cost to build a custom mobile app with AI?
A custom mobile app with AI integration typically costs between $1,500 and $5,000 for a production-grade MVP. The final cost depends on feature complexity, cross-platform needs (iOS & Android), and AI model tokens.
Building with cross-platform frameworks like React Native or Flutter allows sharing up to 90% of the codebase, which significantly reduces the development budget compared to writing separate native iOS and Android apps.
Why hire a dedicated freelance app developer instead of an agency?
Hiring a dedicated freelance developer cuts out agency project management overhead, saving up to 40% in cost while ensuring direct, daily communication with the senior engineer writing the code.
Agencies often delegate work to junior developers while charging premium agency rates. A dedicated developer provides direct accountability, faster feedback loops, and consistent code quality.
What is the average timeline for custom software development?
A typical custom software development project takes 3 to 6 months from initial design to store release. This includes UI/UX designs, backend setup, database architecture, and store deployment.
I focus on building a high-fidelity Minimum Viable Product (MVP) first, allowing you to validate your app in the real market and collect user feedback before investing in secondary features.
What are the advantages of custom software development in Poland?
Poland offers top-tier software engineering talent with fluent English communication at highly competitive rates compared to US/UK agencies. Poland-based freelance developers charge between $25 and $35 per hour on average.
Poland is ranked among the top countries globally for developer skillsets, offering clean code, transparent project tracking, and full alignment with EU data protection (GDPR) compliance.
Comparison: Traditional Software Agency vs. Dedicated Freelancer
Average Hourly Rate
- Agency
- $120 - $200+ (High overhead fees)
- Mikołaj
- $25 - $35 (No overhead markup)
Developer Experience
- Agency
- Often delegated to junior/mid developers
- Mikołaj
- Direct senior-level execution (5+ years)
Communication Flow
- Agency
- Multi-layered (PMs, Account Managers)
- Mikołaj
- Direct Slack, email, and weekly syncs
Delivery Timelines
- Agency
- 6 - 12 months (due to bureaucratic steps)
- Mikołaj
- 3 - 6 months (agile lean MVP focus)
| Operational Parameter | Traditional Software Agency | Dedicated Developer (Mikołaj) |
|---|---|---|
| Average Hourly Rate | $120 - $200+ (High overhead fees) | $25 - $35 (No overhead markup) |
| Developer Experience | Often delegated to junior/mid developers | Direct senior-level execution (5+ years) |
| Communication Flow | Multi-layered (PMs, Account Managers) | Direct Slack, email, and weekly syncs |
| Delivery Timelines | 6 - 12 months (due to bureaucratic steps) | 3 - 6 months (agile lean MVP focus) |