Hire the best JSON Developers in Warsaw, PL
Check out JSON Developers in Warsaw, PL with the skills you need for your next job.
- $21 hourly
- 5.0/5
- (5 jobs)
PROFESSIONAL SUMMARY Hello! My name is Katherine. I am a Front-End developer with 5 years of experience in the commercial sphere. I can create high-quality solutions using key skills: HTML5/CSS3, Javascript, React, JQuery, Magento 2, Shopify, Shopware 6, PrestaShop, WordPress, there are other skills, they are described in my resume. Highly organized and attentive to detail. Able to analyze data, develop strategies, and propose solutions to complex problems. I strive to use skills and knowledge to contribute to the success of the team.
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Tailwind CSSFigmajQueryWordPressShopwarePrestaShopBootstrapReactMagento 2SassCSSHTMLJavaScriptGit - $45 hourly
- 4.8/5
- (33 jobs)
Are you looking for a reliable Frontend Developer who can turn your idea into a scalable, user-friendly product, fast and with zero drama? 🙌 I’m a Frontend Developer with 5+ years of experience building MVPs, dashboards, and custom portals using React, Next.js, Tailwind CSS, and TypeScript. I’ve helped startup founders, solo entrepreneurs, and tech teams go from idea to interactive product fast and clean. 🚀 Whether you're launching a SaaS, building a client dashboard, or need a custom internal tool, I focus on: ✨ Scalable, production-ready code 🎨 Pixel-perfect UIs from Figma or concept ⚡ Fast delivery & smooth handoff 📱 Mobile-first, responsive designs I speak fluent founder, not just code. You won’t get ghosted, blocked by jargon, or left with a mess. I bring a clean, async-friendly workflow, communicate clearly, and care about your long-term success (not just your current ticket). 💬 "Firdavs is doing an amazing job for our startup. He came in to fix a project and is now supporting us almost full-time on all things front-end. What I found most remarkable is how fast he learnt what our application and tool needed and thought about the big picture rather than just a task. He communicates clearly, organizes his work fast and efficiently, and always has a smile on his face. We wouldn't want to miss him anymore." Client (Startup Founder) 🙌 Looking for a developer who can turn your idea into a clean, scalable product — without the drama? Let’s talk! 📨 Check out my Project Catalog for tailored solutions, or drop me a message to discuss your unique needs. Let’s build something great together! 🌟
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Business with 1-9 EmployeesHTMLAPIHTML5XHTMLMaterial UIPSD to HTMLBootstrapGitReactRESTful APIweb3.jsCSSJavaScript - $63 hourly
- 5.0/5
- (4 jobs)
I have been working in the IT field for more than 12 years, I have extensive experience in the development of software products of any kind, as well as competencies in related areas.
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SQLAPILaravelPHPPythonJavaScriptMySQLFlutteriOS DevelopmentPostgreSQLAndroid App Development - $92 hourly
- 5.0/5
- (17 jobs)
𝙏𝙃𝙀 𝙌𝙐𝙄𝘾𝙆 𝙑𝙀𝙍𝙎𝙄𝙊𝙉: I'm a 𝗻𝗼-𝗰𝗼𝗱𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝗻𝘁 𝗮𝗻𝗱 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗴𝗿𝗼𝘄𝘁𝗵 𝗽𝗮𝗿𝘁𝗻𝗲𝗿 with 13+ years of experience. 𝗜 𝗿𝗼𝘂𝘁𝗶𝗻𝗲𝗹𝘆 𝗵𝗲𝗹𝗽 𝟲- 𝗮𝗻𝗱 𝟳-𝗳𝗶𝗴𝘂𝗿𝗲 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝘀𝘆𝘀𝘁𝗲𝗺𝗮𝘁𝗶𝘇𝗲, 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗲 & 𝘀𝗰𝗮𝗹𝗲 𝘁𝗵𝗲𝗶𝗿 𝗰𝗼𝗺𝗽𝗮𝗻𝗶𝗲𝘀 – all without increasing headcount (and the headaches that come with it). 🚀 All systems I build are operational from day one and will immediately start saving you money & time! My all-time favorite? Building CRM systems and consulting on optimizing backend processes. – – – – – 𝗪𝗲'𝗿𝗲 𝗹𝗶𝗸𝗲𝗹𝘆 𝗮 𝗽𝗲𝗿𝗳𝗲𝗰𝘁 𝗺𝗮𝘁𝗰𝗵 𝗶𝗳 𝘆𝗼𝘂’𝗿𝗲 𝘁𝗵𝗶𝗻𝗸𝗶𝗻𝗴: ● “Our operations need streamlining, I don't know where to start and want a PRO to take care of this.“ ● "We're not giving our clients the experience they deserve." ● “We are loosing opportunities to chaos" ● “We’ve grown, and our systems need to catch up!” ● “It feels I’m too deep in my business to spot inefficiencies.” ● “I’m NOT a tech expert, and I don’t have time to tinker with tools!” 𝗦𝗼𝘂𝗻𝗱𝘀 𝗹𝗶𝗸𝗲 𝗮 𝗳𝗶𝘁? – 𝗵𝗲𝗿𝗲 𝗮𝗿𝗲 𝘁𝗵𝗲 𝗻𝗲𝘅𝘁 𝘀𝘁𝗲𝗽𝘀: 🖥️ Check out my testimonials, portfolio and previous projects on Upwork 🟢 If you're ready to move forward, press the '...' button (in the top right-hand corner), then select ‘Invite to Job’ and let's have a pure-value, no-strings-attached disco call (no selling on my part) ⌚ If you have a minute, you might want to read more about me 👇 = = = = = = 𝙏𝙃𝙀 𝙇𝙊𝙉𝙂𝙀𝙍, 𝙎𝙄𝙏-𝘿𝙊𝙒𝙉 𝙑𝙀𝙍𝙎𝙄𝙊𝙉: It is a pleasure to meet you! 👋 I'm Roger, a no-code developer, business consultant – and a person with a strong 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗿 𝗺𝗶𝗻𝗱𝘀𝗲𝘁. I personally have 𝗼𝘃𝗲𝗿 𝟭𝟱𝟬 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻𝘀 running for me 24/7 to show for myself, so you could say I live by what I preach 😎 I have over a decade of entrepreneurial experience, throughout my life I've ran brick-and-mortar stores and operated a breakfast catering business, where we worked with Booking.com and Airbnb hosts to help them deliver world-class experiences. My favorite setting is working in longer-term arrangements with solopreneurs, founders and small teams - it allows me to directly see the impact I make when I free their hands and save dozens of hours per week, which they can then use to do the really 𝗵𝗶𝗴𝗵 𝗥𝗢𝗜 things in their business. When working with me on Upwork, on top of my technical skills, you also get a 𝗽𝗲𝗿𝘀𝗼𝗻 𝘄𝗵𝗼 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝘀 𝘆𝗼𝘂𝗿 𝗻𝗲𝗲𝗱𝘀 in a wider perspective because, as a business owner and operator in the past, I have been confronted with many of the same challenges you are. For me, technology is the great modern-day leveler and nothing brings me more satisfaction than seeing how my automations empower small teams to do HUGE things which they deemed impossible (or accessible only past the $5-10M threshold). That said, most of my clients choose to work with me because of my easy-going and solution-focused approach, as well as my unrivalled attention to detail – and boy, am I all about User Experience! (yes, my systems aren’t only effective but also a breeze to interact with) I sincerely look forward to setting up an automation (or two) for you! 😊 – – – – – 👇 𝗛𝗲𝗿𝗲 𝗮𝗿𝗲 𝘀𝗼𝗺𝗲 𝗼𝗳 𝘁𝗵𝗲 𝘄𝗮𝘆𝘀 𝗜 𝗺𝗼𝘀𝘁 𝗰𝗼𝗺𝗺𝗼𝗻𝗹𝘆 𝗵𝗲𝗹𝗽 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝘀𝗮𝘃𝗲 𝘁𝗶𝗺𝗲 𝗮𝗻𝗱/𝗼𝗿 𝗺𝗼𝗻𝗲𝘆 👇 📊 Optimizing B2B sales processes with 𝗯𝗲𝘀𝗽𝗼𝗸𝗲 𝗖𝗥𝗠 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 to automatically collect data and notify team members 📦 Saving brick-and-mortar stores thousands of dollars by creating effective 𝗶𝗻𝘃𝗲𝗻𝘁𝗼𝗿𝘆 𝗺𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 that immediately show profitability downfalls 📈 Giving you live insights into the data that's most important to your company by creating multi-channel, 𝗶𝗻𝘁𝗲𝗿𝗮𝗰𝘁𝗶𝘃𝗲 𝗱𝗮𝘀𝗵𝗯𝗼𝗮𝗿𝗱𝘀 (analytics, sales, campaign performance, etc.) 🕵️♂️ 𝗦𝗰𝗿𝗮𝗽𝗶𝗻𝗴 elusive online 𝗱𝗮𝘁𝗮 and transforming it into ready-made, informative reports, to 𝗽𝗼𝘄𝗲𝗿 𝗱𝗲𝗰𝗶𝘀𝗶𝗼𝗻-𝗺𝗮𝗸𝗶𝗻𝗴 🚀 Decreasing staff churn by developing 𝗼𝗻𝗯𝗼𝗮𝗿𝗱𝗶𝗻𝗴 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 that carry out the process automatically for you and ensure just-in-time learning 📑 Creating 𝗲-𝗱𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗳𝗹𝗼𝘄𝘀 to save time on back-and-forth exchanges with business partners and contractors – – – – – Keywords - my expertise: Retail, Marketing, Hospitality, Startups, Tech, B2B Services, No-Code Development, Business Growth, Process Optimization, Operational Excellence, Automation, CRM Systems, ClickUp, Monday.com, Airtable, Artificial Intelligence, Softr, Buffer, Inventory Systems, Interactive Dashboards, Looker Studio, Data Scraping, Apify, Customer Portals, Vector Databases, Onboarding Systems, Pandadoc, Stripe, E-Documentation, Google Drive, Dropbox, User Experience, Process Improvement, Small Business Solutions
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Microsoft Exceln8nJotformZapierMake.comClickUpAirtableGrowth StrategyArtificial IntelligenceAI Model IntegrationBusiness Process AutomationAPI IntegrationAPIAutomation - $35 hourly
- 5.0/5
- (15 jobs)
With over three years of experience leading Android development teams, I specialize in creating innovative mobile solutions that elevate user experiences. My expertise spans a wide range of skills, including Android development, technical documentation, product management, app deployment, and software architecture. I excel in team leadership, fostering collaboration and driving continuous improvement, while skillfully managing conflict resolution and ensuring smooth operations. Proficient in Java and Kotlin programming, version control systems, API integration, and database management, I bring technical depth to every project. From managing issue tracking systems to optimizing apps for social media platforms, I thrive on delivering high-quality results and pushing the boundaries of mobile technology to achieve exceptional outcomes. I am confident that my skills and experience align perfectly with your needs, and I am excited about the opportunity to contribute to your project. Thank you for considering my application. I look forward to the possibility of working together.
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RESTful ArchitectureJavaFXGitKotlinJavaAndroid App DevelopmentIn-App AdvertisingSmartphoneAndroid SDKAPI IntegrationSQLite ProgrammingChat & Messaging SoftwareAndroid - $16 hourly
- 5.0/5
- (3 jobs)
Hi! I’m a passionate Front-End Developer with a strong background in building responsive, fast, and visually appealing websites and interfaces. I work with: React, JavaScript, HTML5, CSS3, Bootstrap, Tailwind CSS WordPress (custom themes & builders) Figma, Adobe XD, Illustrator I specialize in: ✅ Designing and coding responsive landing pages ✅ Developing custom WordPress websites ✅ Creating intuitive user interfaces with React ✅ Improving performance and accessibility ✅ Clean, maintainable code and clear communication My goal is to bring your vision to life — fast, pixel-perfect, and user-friendly. Let’s build something awesome together 🚀
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Graphic DesignWordPress ThemeAdaptive Web DesignBEMAdobe IllustratorFigmaMySQLCSS 3JavaScriptHTML5ReduxReactNode.js - $30 hourly
- 5.0/5
- (3 jobs)
I am an experienced and motivated strong senior iOS developer, interested in skillfully creating creative mobile applications and utilities. I understand the importance of creating easy-to-read, reusable, and easily maintained source code. I constantly strive to learn new technologies and look for ways to improve myself in this rapidly changing industry. My strengths and skills: - 7 years of iOS development - Degree in Computer Science - Experience developer native iOS application - Knowledge of APIs and design patterns (MVC, MVP etc) - Push notifications - REST API development skills - Experience MapKit, MapBox - Stripe - Firebase - Firestore - Crashlytics - In-App purchases - etc
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WebsocketsSnapKitMixpanelMapboxMapKitPush NotificationsiOS DevelopmentiOSFirebaseAlamofireSwift - $40 hourly
- 0.0/5
- (0 jobs)
Passionate and detail-oriented Software Engineer with strong expertise in Java, Spring Boot, and JUnit testing. Experienced in designing, developing, and maintaining scalable backend applications, RESTful APIs, and microservices. Adept at writing clean, efficient, and well-tested code following best practices. Always eager to learn new technologies and expand skill sets to stay ahead in the ever-evolving tech landscape. Open to exploring cloud platforms, DevOps tools, and modern software development methodologies to enhance project efficiency and scalability. Looking forward to contributing to innovative projects and collaborating with dynamic teams to build high-quality software solutions.
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Object-Oriented ProgrammingScrumJUnitSQLGitSpring BootJava - $20 hourly
- 0.0/5
- (0 jobs)
I am a .NET Developer with 5 years of professional experience, specializing in the FinTech domain and contactless delivery solutions. My expertise includes extensive work with SQL Server, where I have managed complex databases In addition to my backend development skills, I have hands-on experience with Angular, providing me with a solid understanding of frontend-backend interactions. This experience allows me to effectively troubleshoot and fix minor UI bugs, ensuring a seamless user experience. My goal is to continue delivering high-quality software solutions that meet client needs and exceed expectations.
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PostmanFiddlerGitNUnitRedisMicrosoft SQL ServerXMLASP.NET Web API.NET CoreEntity FrameworkJavaScriptCSSHTMLC# - $5 hourly
- 0.0/5
- (0 jobs)
I’m a junior iOS developer with a strong interest in building simple, functional apps using Swift and UIKit. I understand how to structure small projects using patterns like MVC and MVVM, and I enjoy turning ideas into working applications. -Build small iOS apps using Swift and UIKit (without Storyboards) -Implement basic app logic, navigation, and UI elements in code -Apply architectural patterns like MVC and MVVM in simple projects -Work comfortably in Xcode and debug using built-in tools -Communicate clearly and stay in sync during development I’m focused on learning and improving with every project. If you need help with a small app or a specific feature, feel free to reach out!
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App DevelopmentSwiftUIKitiOS Development - $6 hourly
- 0.0/5
- (0 jobs)
Hello! My name is Anastasia, I’m a junior QA engineer. During my training, I worked with Jira, Postman, Charles, TestRail, and SQL. I can write test cases, detect bugs, and communicate effectively with the team. I’d be happy to join your project!
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