Fively

✅ 100+ in-house experts ✅ 85% senior-level engineers ✅ 50+ successful projects ✅ 100% privacy and security ✅ 10+ years on Upwork 🔥 Free pre-project consultations 🔥 Accurate project estimations 🌎 Clients from the USA, the UK, Ireland, Germany, Norway, Denmark, Italy, and many other countries Fively is a modern full-cycle software development company of 100+ engineers with robust tech backgrounds, with a dedicated focus on production AI. We build bespoke software, and AI features on top of it, for both small yet future-proof startups and well-established businesses. We mainly focus on: — AI, ML & LLM engineering (LLM features, RAG systems, AI agents); — Complex web applications engineering; — Mobile applications development; — Browser extensions engineering; — MVP software engineering; — Legacy software rewriting and refactoring; — UI and UX design. AI/ML with Fively Our AI practice ships production-grade LLM features, RAG systems, and agentic workflows — with evaluation, guardrails, and explicit latency and cost KPIs. We help teams move from a promising demo to a reliable feature: choosing the right models and vector stores, designing retrieval and data pipelines, and integrating AI safely into existing products. Recent work spans document intelligence and contract review (LegalTech), data extraction, and AI-assisted automation and testing. Our team aims to provide you with great code as well as help your business grow fast yet stably. We have created dozens of successful custom-tailored products for companies in industries such as eCommerce, real estate, cybersecurity, HealthTech, FinTech, and LegalTech. To develop top-notch solutions, our engineers use reliable technologies such as Python, Node.js, React, Next.js, .Net, GO, Ruby, Angular, Vue, AWS, Google Cloud, Redis, PostgreSQL/pgvector, MySQL, MongoDB — plus a dedicated AI stack: LangChain/LangGraph, LlamaIndex, Pinecone/Qdrant, TensorFlow, PyTorch, scikit-learn, Pandas, NumPy, Langfuse, and MLflow. The work of our engineers was highly appreciated by our clients, and Fively itself occupies high positions in various ratings of the best software companies. This includes renowned review platforms such as Clutch, theManifest, TechReviewer, TechBehemoth, GoodFirms, and numerous others.