
Closed
Posted
Paid on delivery
We are looking for a freelancer or development team to build a simple, practical mobile app for Unikem, a company specialized in drilling fluid additives for trenchless / HDD applications. The app will act as a field support tool, helping operators quickly determine: which products to use how much product is needed correct dosage and basic treatment recommendations The focus is speed, clarity, and accuracy in real job-site conditions. - Core Functionality (Main Goal) The app must include a calculator where the user inputs key project data: Bore diameter Bore length Soil type (predefined selectable categories) Water quality (basic classification) Estimated mud volume Drilling objective or problem (e.g. stabilization, lubrication, fluid loss, etc.) Based on these inputs, the app returns: Recommended product(s) Quantity required Dosage range Simple usage instructions The logic will be rule-based and formula-driven, and will be fully provided by us. - Features & Requirements Clean, simple UI optimized for field use (fast input, clear output) Ability to recommend multiple products in combination Output screen must clearly display: product name dosage quantity short notes/instructions Product screen should include: product image Technical Data Sheet (PDF) Share/export function (for sending or saving calculation summaries) App must work offline after initial data download (calculator + documents) Architecture must allow: easy update of products and formulas future addition of languages English language initially (multi-language ready) - Technical Preferences Mobile app (iOS + Android) preferred Single codebase preferred (Flutter / React Native), but open to alternatives Performance and maintainability are more important than specific framework - Deliverables Full source code Build and deployment instructions TestFlight (iOS) and internal testing build (Android) Proper structure for future updates - We Will Provide Product list Technical data sheets Calculation formulas and selection logic Example calculation sheets (if needed) - Nice to Have Experience with technical / industrial / engineering calculators Experience with offline-first apps Ability to design simple, intuitive UX - To Apply, Please Include Examples of similar apps or calculators you have built Your proposed tech stack Estimated timeline to MVP Estimated budget Any suggestions to improve reliability and usability - Budget Open to proposals
Project ID: 40371326
156 proposals
Remote project
Active 24 secs ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
156 freelancers are bidding on average €3,935 EUR for this job

A Warm Hello! We are readily available to start working on this project! We are confident to provide you practical, field-ready mobile app for Unikem. Your goal—helping operators make fast, accurate product decisions on-site—is exactly the kind of problem we enjoy solving through simple, reliable digital tools. We will provide you mobile-first calculator app that: - Works quickly in real job-site conditions - Converts technical inputs into clear product recommendations - Functions offline after initial setup - Is structured for easy updates and future scalability We can start immediately and deliver a reliable MVP within your timeline. Looking forward to collaborating with you. Best regards, Ana
€5,000 EUR in 70 days
9.9
9.9

⭐️⭐️⭐️⭐️⭐️ Unikem Field Calculator App (Offline-Ready, Fast & Accurate) ⭐️⭐️⭐️⭐️⭐️ I understand you need a reliable, field-ready mobile app that quickly calculates product recommendations, dosage, and quantities based on drilling parameters—even without internet access. Estimated Budget: $2,500 – $4,000 Proposed Tech Stack: • Flutter (single codebase for iOS + Android) • Local DB (SQLite) for offline-first data + PDFs • Lightweight rule engine (JSON-based formulas for easy updates) • Optional Firebase (for future updates/sync only) Key Features: • Smart calculator (bore, soil, water, volume → recommendations) • Multi-product output (dosage, quantity, usage notes) • Product library (images + Technical Data Sheets PDF) • Offline-first functionality (works fully on-site) • Export/share calculation summary (PDF/WhatsApp/email) • Scalable structure (easy product/formula updates + multi-language ready) Let’s Chat… Thanks
€3,200 EUR in 7 days
9.5
9.5

With over a decade of experience in full-stack architecture and high-scale systems, I understand the need to create a practical mobile app for Unikem that enhances field operations for drilling fluid additives in trenchless/HDD applications. My background in developing high-complexity systems, like scaling applications for over 1 million users, directly applies to the speed, clarity, and accuracy requirements of your project. A strategic insight I can offer is to prioritize an offline-first approach to ensure the app remains functional in real job-site conditions. My past success in building Telegram Mini Apps for large user bases demonstrates my capability to handle the complexity of rule-based and formula-driven logic necessary for this project. I encourage you to reach out to discuss the roadmap for the Unikem Support Calculator App further. Let's collaborate to bring your vision to life efficiently and effectively.
€4,000 EUR in 45 days
8.4
8.4

Hi, This is Elias from Miami. I checked your project description and understand you need a practical mobile field-support app for Unikem that helps HDD operators quickly calculate the right products, dosage, and treatment recommendations based on project conditions, even when working offline on-site. I would approach this by building a clean cross-platform app with a fast calculator flow, offline data/document support, and a structured rule engine so your formulas, products, and future languages can be updated easily without rebuilding the whole system. I’ve worked on calculator-style apps and data-driven tools where usability, accuracy, and maintainability were the key priorities. I’d be happy to go through the details and suggest the best technical approach. I have a few questions to get a better understanding: Q1 – Do you want the formula and recommendation logic stored fully inside the app for offline use, or should product/formula updates sync from an admin-managed JSON/API when internet is available? Q2 – Will the export/share summary need to generate a branded PDF report, or is a clean text/image summary enough for the MVP? Q3 – Do you already have the product images, TDS PDFs, and rule tables in a structured format, or would part of the first milestone include organizing that data for the app? Looking forward to hearing from you.
€4,000 EUR in 7 days
8.3
8.3

As a versatile and experienced electrical engineer, I have the necessary skills to build your Unikem Support Calculator app to the highest standard. My proficiency in the use of microcontrollers and embedded systems such as Raspberry Pi and Arduino aligns perfectly with your need for a performance-oriented tool. Being well versed in firmware development, especially in regard to wireless stacks like BLE and Wi-Fi which will be useful for an offline-first app, I can assure you that your desired features will all be achieved. In addition to my technical capabilities, my experience with IoT product engineering appears quite relevant here. Your project will also benefit from my knowledge of cloud dashboards, APIs and real-time monitoring garnered from developing secure and scalable device-to-cloud communication pipelines. These skills enable me to provide sound advice on how to improve both reliability and usability, what technologies should be chosen to ensure a maintainable app in the long run, as well as define a clear timeline within budget for your MVP.
€5,000 EUR in 30 days
8.2
8.2

Hello, I understand you need a straightforward mobile app to support Unikem’s drilling fluid additive users by helping them quickly select products and calculate dosage on-site. The app will let users enter project details like bore diameter, soil type, and drilling goals, then use your provided formulas and rules to suggest product combinations, quantities, and instructions. I'll focus on a clean and fast interface for field use, ensure offline functionality after initial download, and make updates easy. The app will also include product images, data sheets, and export options, all built in a single codebase for iOS and Android using a flexible framework like React Native or Flutter to keep performance and maintenance smooth. To get started efficiently, I’d like to clarify a few things: What specific soil categories and water quality classes need to be included? How often do you expect product data or formulas to change? Should the app save previous calculations for review or sharing later? Do you have preferred formats for export (PDF, email, CSV)? Are there any particular offline data storage requirements or limits? What would you say is the top priority for the user experience when using the Unikem Support Calculator app on-site? Thanks,
€5,000 EUR in 24 days
7.7
7.7

Hello Unikem Team, Thank you for outlining the project requirements for the Unikem Support Calculator App. We've thoroughly reviewed your needs and are excited about the opportunity to deliver an efficient, user-friendly mobile solution. We understand you're looking for a practical, offline-capable app to assist operators in the field with quick, accurate calculations for drilling fluid additives. Recently, we've developed apps with similar functionalities, focusing on real-time calculations and rule-based logic, ensuring quick and precise outputs even in challenging environments. With over 8 years of experience and having served 200+ clients, our expertise in mobile app development, particularly with React Native and Flutter, aligns perfectly with your requirements. We excel in creating clean, intuitive UIs and ensuring robust offline capabilities, making our solutions ideal for field applications. Our team, led by Puru Gupta, is renowned for delivering top-rated results, specializing in AI-enabled, scalable applications, and would bring this comprehensive skill set to your project. You can trust us to seamlessly integrate the technical specifications and functionalities you require. We invite you to message us to discuss your project further. Upon understanding more details, we will provide a detailed, tailored proposal within 24 hours. Looking forward to the possibility of collaborating with you. Warm regards, Puru Gupta and Team
€5,000 EUR in 30 days
7.6
7.6

⭐⭐⭐⭐⭐ Create a User-Friendly Mobile App for Drilling Fluid Additives ❇️ Hi My Friend, I hope you're doing well. I’ve reviewed your project needs and see you are looking for a mobile app for Unikem. You don’t need to look any further; Zohaib is here to help you! My team has completed over 50 similar projects for mobile applications. I will build a practical app that helps operators quickly determine the right products, dosage, and treatment recommendations. The app will feature a simple calculator for inputting project data and provide immediate results. I will ensure a clean and clear user interface that works seamlessly in real job-site conditions while staying within your budget. ➡️ Why Me? I have 5 years of experience in mobile app development, particularly in creating user-friendly interfaces and functional calculators. My skills include Flutter, React Native, and offline app solutions. I also have a strong grip on integrating technical data and ensuring app performance. ➡️ Let's have a quick chat to discuss your project in detail and let me show you examples of my previous work. I look forward to our conversation! ➡️ Skills & Experience: ✅ Mobile App Development ✅ Flutter ✅ React Native ✅ UI/UX Design ✅ Offline Functionality ✅ Technical Calculators ✅ Data Integration ✅ Performance Optimization ✅ Code Maintenance ✅ API Development ✅ Testing & Deployment ✅ User Support Waiting for your response! Best Regards, Zohaib
€3,400 EUR in 2 days
7.9
7.9

I understand the need for a practical mobile app for Unikem to help operators quickly determine the right products, dosage, and treatment recommendations for trenchless/HDD applications. The app will feature a clean UI, rule-based logic, and offline functionality. I have experience developing similar industrial calculators, and I propose using Flutter for the tech stack. I estimate a timeline of 8 weeks for MVP development. Budget can be adjusted after full project scope discussion, and my priority is to deliver within your budget. Please review my profile for past work. Let's discuss the details and get started on this project. Looking forward to your response. Please go through my profile its 15 years old see the work I did over the years. No Win No Fee means that your satisfaction is my utmost priority. Lets discuss the job details. Moreover, I am willing to start the job and perform tasks without even being hired; it is just to show my commitment to this project. Looking forward to hear from you.
€3,150 EUR in 32 days
7.6
7.6

Hi, You need a lean support calculator app that works across iOS and Android without maintaining two codebases. Quick question: are you prioritizing speed-to-market or native performance here? That shapes whether React Native or Flutter makes sense for your timeline. Let's talk details. Best Regards, Hasan
€3,000 EUR in 60 days
7.6
7.6

Since 2015 I have been working in C/C++/C# programming and 10(ten) years of experience in C/C++/C# programming. Windows Desktop Application, Console Application, Image Processing and have knowledge in Driver Development in C. Expert in data structure building and Object Oriented Programming (OOP). Have a great experience in C++ MFC and C++ WinUI 3 for GUI design and development. Also expert in C/C++ GPU CUDA programming. If you want a good delivery of the project, then send me a message, please.
€5,000 EUR in 45 days
7.3
7.3

I am a seasoned mobile app developer with extensive experience in building technical calculators and field tools for industrial applications. My expertise in using Flutter ensures fast, reliable development of cross-platform mobile applications like the Unikem Support Calculator App. With a focus on speed, clarity, and accuracy, I can create a clean and simple UI optimized for field use, ensuring operators have a seamless experience even in offline scenarios. I have successfully developed similar apps, incorporating rule-based calculation engines that recommend products and dosage based on dynamic inputs. My recent projects include a drilling fluid management app that featured offline capabilities and an intuitive UX, similar to your requirements. I have also worked on apps that easily adapt to future updates and multilingual needs, aligning perfectly with your requirement for maintainability and expandability. I am interested in discussing how we can deliver a robust MVP within your timelines. Could you please share more about the preferred timeline and budget estimates? Looking forward to the opportunity to collaborate on this project.
€4,500 EUR in 30 days
7.2
7.2

The main failure risk here isn’t the calculator logic—it’s operators losing trust if results feel inconsistent across similar inputs or lag under field conditions (offline, low-end devices). That’s where most “simple” tools break down. I’d structure this as a fully offline-first mobile app using a single codebase (React Native or Flutter), with all formulas and rules stored in a versioned local data layer (JSON + lightweight rule engine). Inputs map to deterministic calculation modules, ensuring consistent outputs without runtime ambiguity. I’d add validation guards (e.g., unrealistic bore/volume combinations) to prevent bad field inputs. Product data, PDFs, and logic updates would be decoupled via a syncable content bundle, so future updates don’t require full app redeploys. UX-wise: fast tap-based inputs, cached last entries, and one-screen results optimized for readability in harsh conditions. Built similar rule-driven systems in Bubbl (Vue/Nuxt/Express, scalable API logic) and Aras (Python/PHP backend calculators), improving reliability and reducing input errors significantly. Happy to align on the calculation model and ship a stable MVP quickly. Q1: How complex are the product combination rules—deterministic mapping or conditional layering based on multiple variables? Q2: Do formulas require unit normalization (metric/imperial) or region-specific variations? Q3: How frequently do you expect product data or calculation logic to change post-launch?
€3,500 EUR in 7 days
7.0
7.0

Hello, I hope you are doing well. I understand that you are looking to build a CALCULATOR MOBILE APPLICATION, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
€3,000 EUR in 25 days
7.0
7.0

Hi, I have strong experience in Flutter, React Native, mobile app architecture, and offline-first app development, building practical calculator-based tools for field operations with structured product logic, PDF access, export features, and simple multi-platform deployment. For this project, I would build a fast and reliable field app where operators can enter drilling job data, get clear product and dosage recommendations instantly, access technical sheets offline, and share calculation summaries in a format that is easy to use on real job sites. You can expect clear communication, fast turnaround, and a high-quality result that fits seamlessly into your existing workflow. Best regards, Juan
€3,000 EUR in 7 days
5.4
5.4

Hello! As per your project post, you’re looking to build a practical field support mobile application for Unikem that helps drilling operators quickly calculate and determine the correct use of drilling fluid additives based on real job site conditions. The app will function as a fast and reliable decision tool, allowing users to input bore parameters and instantly receive accurate product recommendations, dosage calculations, and usage instructions even in offline environments. My focus will be on delivering a clean and efficient offline first mobile calculator app, featuring: an intuitive input system for bore diameter, length, soil type, water quality, and drilling conditions, a rule based calculation engine that generates product recommendations and dosage ranges, multi product suggestion capability for complex scenarios, and a clear results screen displaying product names, quantities, and field ready instructions. I specialize in building cross platform mobile applications using Flutter or React Native, with a strong focus on offline capable systems, industrial tools, and performance driven UX. My focus is on creating simple, fast, and reliable field applications that work seamlessly in real world conditions where speed and accuracy matter most. Let’s connect to review your calculation logic structure and product data format so we can design a scalable system that is easy to maintain and expand in the future. Best regards, Nikita Gupta.
€3,000 EUR in 45 days
5.4
5.4

I understand you need a fast, clear app for field operators to calculate drilling fluid additive needs, with offline access and easy updates. I’ve built similar calculator apps for technical and industrial clients, focusing on simple inputs and clear, actionable outputs under varying field conditions. To ensure speed and accuracy, I suggest a lightweight Flutter app for cross-platform support and offline capability. The app can cache formulas and product data for instant calculation without delays. For the product screen, embedding PDFs with a viewer that works offline will keep tech sheets handy. Also, adding a small local database enables smooth product/formula updates when online. Do you have a preferred data format for product and formula updates? Would you want push notifications to alert users when a new version is ready? These can boost usability and keep info fresh. I can deliver a clean MVP including calculator, product info with images/pdf, and export/share features within 4-5 weeks. Pricing reflects full functionality and solid offline support. Ready to start building a reliable field tool that your operators will find straightforward and valuable.
€4,000 EUR in 7 days
5.4
5.4

Hello sir, Did go through your job description and glad to share that I have enormous experience in working with Unikem Support Calculator App I'm a seasoned programmer and Engineer with quality experience in Flutter, React, Node.JS, SpringBoot, Frontend and Backend Development, Python, Matlab, R studio, C, C++, C#, OpenCV, OpenGL, Tesseract OCR, google vision, Statistical programming/R progamming data analysis Computing for Data Analysis Time Series & Econometric, Machine learning, AI, Deep learning, Matlab and Mathematica, 3D modeling, CAD/CAM,AutoCAD, 2D, Architectural Engineering, SolidWorks, Unity 3D, PCB, Electronics, Arduino, Automation, Embedded and Firmware , IOT, Electrical/Mechanical Engineering I am a TOP Rated Freelancer, and you can check my reviews here as well: https://www.freelancer.com/u/mzdesmag. Looking forward to potentially working together on this project. Thanks and Best regards, Adekunle.
€4,000 EUR in 7 days
5.2
5.2

Hello there, I will build the Unikem field calculator as a Flutter app for iOS and Android with strict offline-first architecture products, data sheets, and formulas cached locally on first install so it runs fully offline on-site. Inputs feed a rule engine returning recommended products, dosage, quantity, and usage notes, with share/export for summaries. For maintainability, I will keep products and formula rules in a versioned JSON bundle on a CDN, so you can push updates without a store submission. The app fetches new data on next launch and falls back to bundled copy offline. MVP: with full source, build instructions, TestFlight and internal Android build. Questions: 1) Will product images and PDFs ship in the app bundle or download on first launch? 2) Any preferred language list beyond English for the multi-language roadmap? Looking forward to talking through the details. Faizan
€3,000 EUR in 7 days
5.0
5.0

Hello, I can create a straightforward and efficient mobile app for Unikem that helps field operators quickly determine the right products, quantities, and dosages needed for drilling fluid additives. The app will be designed for fast input and clear output, working offline with easy updates for products and formulas, and a UI optimized for field use. I'll focus on making the calculator rule-based and accurate as per your provided formulas, with export features and multi-language readiness. Having worked on technical calculators and offline apps before, I understand the importance of performance and simplicity, ensuring usability even in tough job-site conditions. Thanks, Teo
€3,000 EUR in 20 days
4.5
4.5

Milan, Italy
Member since Apr 14, 2026
€250-750 EUR
€30-250 EUR
$250-750 USD
$15-25 USD / hour
$30-250 USD
₹600-1500 INR
€30-250 EUR
₹750-1250 INR / hour
$8-10 USD / hour
$15-25 AUD / hour
₹400-750 INR / hour
$250-750 USD
€3000-5000 EUR
$750-1500 USD
$30-250 USD
$25-50 USD / hour
₹600-1500 INR
$30-250 USD
₹12500-37500 INR
₹100-400 INR / hour