# CimaStudio > CimaStudio is a globally operating technology and design studio that builds SaaS products, EdTech platforms, AI features (RAG, AI agents, voice AI) and React Native mobile apps for founders and SMEs. Founded and led by Slavik Chernenko. A global team working across Europe, with clients in the US, UK and EU. Full text of every case study: https://cimastudio.dev/llms-full.txt ## How to hire CimaStudio - On Upwork: https://www.upwork.com/freelancers/~01ee403e3794273b8a (Slavik Chernenko, Expert-Vetted, top 1% of talent, 100% Job Success). Good for clients who prefer Upwork contracts, escrow and reviews. - Directly: project form at https://cimastudio.dev/#contact or email hello@cimastudio.dev. Reply within 24 hours. - Good fit: founders and SMEs who need a SaaS product, EdTech platform, AI feature (RAG, AI agents, voice AI) or React Native app built end to end; teams adding AI to an existing product; projects with GDPR or HIPAA requirements. ## Founder Slavik Chernenko is the Founder, CEO and Technical Lead of CimaStudio, with more than seven years of hands-on experience building EdTech and SaaS products, AI and LLM systems, RAG pipelines and React Native mobile apps. He and his team have delivered 115+ projects across SaaS and EdTech, including Palinoo (a voice storytelling app for kids, nominated for the TOMMI 2026 award), a GDPR-first AI assistant used by schools in Ireland and the UK, ProCodes Companion (an AI platform for construction teams), Taskfold (an AI email-to-task platform), an adaptive SAT and ACT prep platform, Wisebird (an AI assistant for family caregivers), Macky.ai (AI business consulting for SMEs), PopMystic GPT (an AI research tool over movie and TV dialogue) and Perfect Prompt Generator (a multi-model AI prompt tool). Profile: https://cimastudio.dev/about - LinkedIn: https://www.linkedin.com/in/vyacheslav-chernenko/ - Also known as: Viacheslav (Vyacheslav) Chernenko (full name, used on LinkedIn), Slav Chernenko - Role: Founder, CEO and Technical Lead; leads every CimaStudio project personally with a small senior team - Lives in Vinnytsia, Ukraine; the CimaStudio team works across Europe, with clients in the US, UK and EU; speaks English and Ukrainian - Upwork: Expert-Vetted (top 1% of talent), 100% Job Success on his personal profile - Industries: EdTech, HealthTech, LegalTech, research tools, enterprise SaaS - AI work: RAG pipelines and vector databases, AI agents, voice AI (ElevenLabs, Whisper), multi-model setups with OpenAI, Anthropic Claude and Google Gemini, LangChain - Engineering: React, Next.js, Node.js, TypeScript, Python, React Native, PostgreSQL, Stripe, AWS, Cloudflare - Compliance: GDPR-first architecture for schools and children's apps, HIPAA-aware healthcare tools, FERPA and COPPA considerations - Approach: starts small, gets a product to real users early, and builds the next phase from their feedback ## Key facts - Founder, CEO and Technical Lead: Slavik Chernenko (https://cimastudio.dev/about) - Upwork: Expert-Vetted (top 1% of talent), 100% Job Success, 18,000+ hours delivered (https://www.upwork.com/freelancers/~01ee403e3794273b8a) - 115+ projects delivered across SaaS and EdTech - 7 years building web, mobile and AI products - Industries: EdTech, HealthTech, LegalTech, research tools, enterprise SaaS - Compliance experience: GDPR (schools and children's apps), HIPAA, FERPA and COPPA considerations - Stack: React, Next.js, Node.js, TypeScript, Python, React Native, PostgreSQL, Stripe; OpenAI, Anthropic Claude, Google Gemini, LangChain, ElevenLabs - Best fit: founders and small and medium businesses who need a whole product built, and teams adding AI to an existing product - LinkedIn: https://www.linkedin.com/company/cimastudio-dev/ - Contact: hello@cimastudio.dev, project form at https://cimastudio.dev/#contact ## What clients say - "Working with Slavik and the Cima Studio team continues to be an excellent experience. As the Intentionalist AI project has evolved, they've been consistently responsive, flexible, and committed to getting things right." (David Chorpenning, CEO, Intention Academy) - "They are a great value, and most importantly, great communicators. AI development is constantly changing by the week which makes development an extremely difficult moving target, though objectives and timelines are always clearly communicated and they are able to adapt to changing needs and industry innovations. Would definitely recommend." (Tim Orozco, Managing Partner, Stratus Information Systems) - "Slavik and his team were great. They brought our vision to life and addressed any concerns we had throughout the process. They were timely and efficient. We'll definitely work with them again." (Meredith Singleton, CEO and Founder, Story Arc Learning) - "I hired Slavik to build an AI chatbot for family caregivers of older adults to help them find high-quality resources near them. The team did an awesome job. They worked quickly and thoughtfully and made sure we were happy at every step of the journey. Very good hire!" (Lauren Lachs, President, Wisebird) - "I hired Slavik and his team to produce a prototype. They were helpful, proactive and professional from the get-go. They were adaptable and diligent throughout, and finally, they produced a high-quality product that distilled quite a lot of technical complexity into an impressively simple, reliable UX. Highly recommended across the piece!" (Christopher Duncan, Founder, Eplex AI) - "The team's communication was excellent. All of Slavik's team appears to know what they're doing and I'd rate their skills high. I will continue to work with Slavik and his crew as my business continues to grow." (Founder, ProCodes Companion, Upwork review) - "Competent development with thorough communication. Feedback was effectively incorporated throughout the lifecycle of the project. The final product is very good and we stayed within the agreed upon budget." (Founder, SAT and ACT prep platform, Upwork review) ## Services - SaaS product development: web apps with accounts, roles, subscriptions, dashboards and admin panels - EdTech platform development: learning, tutoring, test prep and school tools - AI and LLM integration: RAG over company documents, AI agents, voice assistants, multi-model setups - Mobile apps: iOS and Android with React Native ## Case studies - [Palinoo](https://cimastudio.dev/work/palinoo): Voice storytelling app that turns a child's short chat into a narrated story. Nominated for the TOMMI 2026 children's software award (Apps; Best Family Game, Preschool). Stack: Claude, ElevenLabs, React Native, Node.js, Stripe. Live: https://www.palinoo.de/ - [GDPR-first AI assistant for schools](https://cimastudio.dev/work/ai-assistant-for-schools): An AI assistant used by schools in Ireland and the UK, built so student data never reaches the model. Stack: Claude, GPT-4o, Gemini, Node.js, React, Stripe, ElevenLabs. - [ProCodes Companion](https://cimastudio.dev/work/procodes): AI platform for construction: a code assistant that answers from building codes, zoning rules and uploaded project documents with citations, plans for contractors, developers and government teams, plus bids, proposals, schedules and invoice checks. Stack: React, Node.js, PostgreSQL, OpenAI, Stripe, PWA. Live: https://procodescompanion.com/ - [Taskfold](https://cimastudio.dev/work/taskfold): B2B SaaS that connects to Gmail, Outlook and IMAP, sorts email by project, turns requests into tasks with deadlines, and drafts replies in the user's style from a few words. Delegation, project chat, Stripe plans, EU hosting under GDPR. Stack: React, Next.js, TypeScript, Node.js, PostgreSQL, Redis, OpenAI, Anthropic, Socket.io, Stripe, AWS. - [Adaptive SAT and ACT prep platform](https://cimastudio.dev/work/sat-act-prep-platform): Adaptive SAT and ACT prep platform: test papers digitized with Mathpix and LaTeX, difficulty that adapts at a 70% skill threshold, an AI tutor grounded in verified teaching material (RAG), portals for students, parents and teachers, Stripe billing. Stack: React, Node.js, PostgreSQL, MongoDB, OpenAI, Mathpix, Stripe. - [Wisebird](https://cimastudio.dev/work/wisebird): AI assistant for family caregivers of older adults: a guided conversation, zip-code recommendations, and answers that check a curated provider list, then CMS, Eldercare Locator and Google Places data before general AI knowledge. Stack: React, Node.js, Claude, OpenAI, RAG. Live: https://www.askwisebird.com/ - [Macky.ai](https://cimastudio.dev/work/macky-ai): AI business consulting SaaS for small businesses by Kinetic Consulting: three questions instead of prompts, 55+ categories, Stripe plans, admin-editable templates. Stack: React, TypeScript, NestJS, PostgreSQL, OpenAI, Stripe. Live: https://macky.ai - [PopMystic GPT](https://cimastudio.dev/work/popmystic): AI chatbot and research tool over 500,000+ lines of movie and TV dialogue. Hybrid search (vector plus keyword reranking) finds the right line in the top 10 results 92% of the time on phrase queries, versus 68% for keyword search alone. Stripe plans, WordPress landing page. Stack: React, Node.js, Python, Elasticsearch, OpenAI, Stripe. Live: https://popmysticgpt.com - [Perfect Prompt Generator](https://cimastudio.dev/work/perfect-prompt-generator): SaaS that rewrites plain requests into detailed prompts and compares answers from ChatGPT, Claude, Gemini, DeepSeek, Grok and Perplexity. Stack: multi-LLM APIs, Node.js, React. - [MiloGPT](https://cimastudio.dev/work/milogpt): Enterprise AI assistant that answers from a company's own documents with cited sources and an honest \"I don't know\". Daily SharePoint sync, PII and PHI redaction before data reaches the model, folder-level permissions, Stripe plans and an admin dashboard. Stack: React, Node.js, TypeScript, PostgreSQL, Azure OpenAI, Gemini. ## FAQ ### Do I need to be technical to work with CimaStudio? No. We explain every decision in plain language, show you working software at the end of each sprint, and handle all the technical work. ### What kind of projects does CimaStudio build? SaaS products, EdTech platforms, AI features such as RAG chatbots, AI agents and voice assistants, and iOS and Android apps with React Native. Recent work includes an AI assistant used by schools in Ireland and the UK, a voice storytelling app for kids, and an adaptive SAT and ACT prep platform. ### Where is the CimaStudio team, and which time zones do you work with? We're a global team working across Europe, with clients in the US, UK and EU. Our working hours overlap with both European and US time zones. ### Can you add AI to a product I already have? Yes. We add AI features to existing web and mobile products, including chat over your own documents, AI drafting and summaries, and agents that take actions in your system. We work with OpenAI, Anthropic and Google models and pick the best one for each task. ### How do you handle privacy, GDPR and HIPAA? We plan for privacy before writing any code. We've built GDPR-first AI for schools, where student data is tokenized before it reaches any AI model, HIPAA-aware healthcare tools, and apps for children with consent and content controls. ### Who owns the code? You do. We set up the code repository, hosting and domains in your name, or transfer them to you, so you're never locked in. ### Why do you start small? We've seen good products shut down because the users never came. The tech was there; the market wasn't. That's why we start small and test with real users first. ### Can I hire CimaStudio through Upwork? Yes. Slavik Chernenko is Expert-Vetted (top 1% of talent) on Upwork with 100% Job Success, and you can hire him and the CimaStudio team there: https://www.upwork.com/freelancers/~01ee403e3794273b8a . You can also send a project brief through the form at https://cimastudio.dev/#contact. ### How do we start? Fill in the project form. We'll get back to you within 24 hours, and you get a written blueprint with scope, timeline and cost before any build starts.