Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Roman Kaftanchikov, a Senior Full Stack & AI Engineer with 9 years of experience building scalable SaaS products, AI systems, and Web3-enabled platforms across web and mobile. I thrive on turning complex problems into elegant, production-ready solutions and love collaborating with cross-functional teams to ship impact at scale. I specialize in multi-agent systems with large language models (GPT-4, Claude), LangChain, and end-to-end backend and front-end architectures. I enjoy mentoring engineers, designing robust infrastructure, and delivering data-driven products for enterprise customers worldwide. In my free time I explore new AI tooling and contribute to OSS communities.…Hi, I’m Roman Kaftanchikov, a Senior Full Stack & AI Engineer with 9 years of experience building scalable SaaS products, AI systems, and Web3-enabled platforms across web and mobile. I thrive on turning complex problems into elegant, production-ready solutions and love collaborating with cross-functional teams to ship impact at scale. I specialize in multi-agent systems with large language models (GPT-4, Claude), LangChain, and end-to-end backend and front-end architectures. I enjoy mentoring engineers, designing robust infrastructure, and delivering data-driven products for enterprise customers worldwide. In my free time I explore new AI tooling and contribute to OSS communities.

Roman Kaftanchikov

Full Stack Developer, Web Developer, AI Developer, +7





Hi, I’m Roman Kaftanchikov, a Senior Full Stack & AI Engineer with 9 years of experience building scalable SaaS products, AI systems, and Web3-enabled platforms across web and mobile. I thrive on turning complex problems into elegant, production-ready solutions and love collaborating with cross-functional teams to ship impact at scale. I specialize in multi-agent systems with large language models (GPT-4, Claude), LangChain, and end-to-end backend and front-end architectures. I enjoy mentoring engineers, designing robust infrastructure, and delivering data-driven products for enterprise customers worldwide. In my free time I explore new AI tooling and contribute to OSS communities.…Hi, I’m Roman Kaftanchikov, a Senior Full Stack & AI Engineer with 9 years of experience building scalable SaaS products, AI systems, and Web3-enabled platforms across web and mobile. I thrive on turning complex problems into elegant, production-ready solutions and love collaborating with cross-functional teams to ship impact at scale. I specialize in multi-agent systems with large language models (GPT-4, Claude), LangChain, and end-to-end backend and front-end architectures. I enjoy mentoring engineers, designing robust infrastructure, and delivering data-driven products for enterprise customers worldwide. In my free time I explore new AI tooling and contribute to OSS communities.

Available to hire

Hi, I’m Roman Kaftanchikov, a Senior Full Stack & AI Engineer with 9 years of experience building scalable SaaS products, AI systems, and Web3-enabled platforms across web and mobile. I thrive on turning complex problems into elegant, production-ready solutions and love collaborating with cross-functional teams to ship impact at scale.

I specialize in multi-agent systems with large language models (GPT-4, Claude), LangChain, and end-to-end backend and front-end architectures. I enjoy mentoring engineers, designing robust infrastructure, and delivering data-driven products for enterprise customers worldwide. In my free time I explore new AI tooling and contribute to OSS communities.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Spanish; Castilian

Advanced

Work Experience

Senior AI & SaaS Architect at IBM

April 1, 2025 - October 6, 2025

Led architecture and development of AI-native SaaS platforms serving enterprise teams across legal, healthcare, and finance verticals. Designed multi-agent LLM systems using LangChain, LangGraph, LangSmith, and OpenAI GPT-4 for dynamic knowledge workflows, document intelligence, and AI copilots. Developed modular SaaS architecture with Next.js, NestJS, and PostgreSQL; deployed globally via Vercel and AWS Lambda with high-availability CI/CD. Implemented advanced RAG pipelines with Pinecone, Chroma, and LlamaIndex; enhanced document recall by over 60% across large enterprise datasets. Integrated Stripe for metered billing, access tiers, and invoice automation; built real-time analytics and usage dashboards with D3.js and Supabase.

Lead Mobile & BlockChain Engineer at CryptoBlock.Domains

October 1, 2023 - October 6, 2025

Led development of a cross-platform Mobile SaaS platform using React Native, Expo, and Firebase, enabling over 100K users to track vitals, receive diagnostics, and securely interact with care providers. Integrated OpenAI GPT-4, LangChain, and custom vector models to power intelligent care plan generators, multilingual triage bots, and AI-driven patient history summarization. Architected HIPAA-compliant mobile infrastructure with NestJS, Node.js, and OAuth2 — encrypted data flows, session token handling, and audit-ready logging. Implemented SMART on FHIR APIs, HL7 connectors, and full EMR/EHR integration for real-time health data sync. Designed provider dashboards and WebSocket-powered chat UIs with notifications, real-time vitals charts, and patient triage prioritization. Introduced Web3 features such as tokenized health ID systems, private wallet authentication, and patient-owned data sharing via Solidity-based smart contracts on Polygon testnets. Piloted blockchain-based audit trai

Full Stack SaaS Engineer at Social Snowball

March 1, 2021 - October 6, 2025

Delivered over a dozen full-stack MVPs for early-stage startups in AI, health, edtech, and fintech — building scalable SaaS platforms and mobile apps with React Native, Next.js, and NestJS. Designed microservice backends with Node.js, PostgreSQL, and Firebase for real-time features, analytics pipelines, and user role management. Developed early AI-enhanced onboarding flows and smart form logic using TensorFlow.js and rule-based NLP. Built Web3-enabled subscription engines with Solidity, MetaMask, and Ethereum for token-based access control. Integrated Stripe and Paddle for global recurring billing, implemented dashboards with real-time KPIs and D3.js charts. Established modular design systems and automated CI/CD via Firebase Hosting and Vercel. Acted as a technical lead across multiple MVP teams, mentoring engineers and shaping agile feature delivery.

Senior AI & SaaS Architect at IBM

April 1, 2025 - October 6, 2025

Led architecture and development of AI-native SaaS platforms serving enterprise teams across legal, healthcare, and finance verticals. Designed multi-agent LLM systems using LangChain, LangGraph, LangSmith, and OpenAI GPT-4 for dynamic knowledge workflows, document intelligence, and AI copilots. Developed modular SaaS architecture using Next.js, NestJS, and PostgreSQL; deployed globally via Vercel and AWS Lambda with high-availability CI/CD. Implemented advanced RAG pipelines with Pinecone, Chroma, and LlamaIndex; enhanced document recall by over 60% across large enterprise datasets. Integrated Stripe for metered billing, access tiers, and invoice automation; built real-time analytics and usage dashboards with D3.js and Supabase. Collaborated with product managers, AI researchers, and cloud engineers across 5+ international time zones, delivering quarterly product expansions.

Lead Mobile & BlockChain Engineer at CryptoBlock.Domains

October 1, 2023 - October 6, 2025

Led development of a cross-platform Mobile SaaS platform using React Native, Expo, and Firebase, enabling over 100K users to track vitals, receive diagnostics, and securely interact with care providers. Integrated OpenAI GPT-4, LangChain, and custom vector models to power intelligent care plan generators, multilingual triage bots, and AI-driven patient history summarization. Architected secure, HIPAA-compliant mobile infrastructure with NestJS, Node.js, and OAuth2 — including encrypted data flows, session token handling, and audit-ready logging systems. Implemented SMART on FHIR APIs, HL7 connectors, and full EMR/EHR integration for real-time health data sync. Designed provider dashboards and WebSocket-powered chat UIs with OneSignal-based push alerts, real-time vitals charts, and patient triage prioritization. Introduced Web3-enabled features such as tokenized health ID systems, private wallet auth, and patient-owned data sharing via Solidity-based smart contracts on Polygon testnet

Full Stack SaaS Engineer at Social Snowball

March 1, 2021 - October 6, 2025

Delivered over a dozen full-stack MVPs for early-stage startups in AI, health, edtech, and fintech — building scalable SaaS platforms and mobile apps using React Native, Next.js, and NestJS. Designed microservice backends using Node.js, PostgreSQL, and Firebase; supported real-time features, analytics pipelines, and user role management. Developed early AI-enhanced onboarding flows and smart form logic using TensorFlow.js, rule-based NLP engines, and custom ML classifiers for HR and marketing platforms. Built Web3-enabled subscription engines using Solidity, MetaMask, and Ethereum for token-based access control. Integrated Stripe and Paddle to support global recurring billing; dashboards with real-time KPIs and D3.js charts. Delivered rapid prototyping through modular design systems and automated build/deploy pipelines via Firebase Hosting and Vercel. Acted as technical lead across MVP teams, mentoring junior engineers, setting up Git workflows, and overseeing agile feature delivery

Senior AI & SaaS Architect at IBM

April 1, 2025 - October 6, 2025

Led architecture and development of AI-native SaaS platforms serving enterprise teams across legal, healthcare, and finance verticals. Designed multi-agent LLM systems using LangChain, LangGraph, LangSmith, and OpenAI GPT-4 for dynamic knowledge workflows, document intelligence, and AI copilots. Developed modular SaaS architecture using Next.js, NestJS, and PostgreSQL; deployed globally via Vercel and AWS Lambda with high-availability CI/CD. Implemented advanced RAG pipelines with Pinecone, Chroma, and LlamaIndex; enhanced document recall by over 60% across large enterprise datasets. Integrated Stripe for metered billing, access tiers, and invoice automation; built real-time analytics and usage dashboards with D3.js and Supabase. Collaborated directly with product managers, AI researchers, and cloud engineers across 5+ international time zones, delivering quarterly product expansions.

Lead Mobile & BlockChain Engineer at CryptoBlock.Domains

October 1, 2023 - October 6, 2025

Led development of a cross-platform Mobile SaaS platform using React Native, Expo, and Firebase, enabling over 100K users to track vitals, receive diagnostics, and securely interact with care providers. Integrated OpenAI GPT-4, LangChain, and custom vector models to power intelligent care plan generators, multilingual triage bots, and AI-driven patient history summarization. Architected secure, HIPAA-compliant mobile infrastructure with NestJS, Node.js, and OAuth2 — including encrypted data flows, session token handling, and audit-ready logging systems. Implemented SMART on FHIR APIs, HL7 connectors, and full EMR/EHR integration for real-time health data sync. Designed provider dashboards and WebSocket-powered chat UIs with OneSignal-based push alerts, real-time vitals charts, and patient triage prioritization. Introduced Web3-enabled features such as tokenized health ID systems, private wallet auth, and patient-owned data sharing via Solidity-based smart contracts on Polygon testnet

Full Stack SaaS Engineer at Social Snowball

March 1, 2021 - October 6, 2025

Delivered over a dozen full-stack MVPs for early-stage startups in AI, health, edtech, and fintech — building scalable SaaS platforms and mobile apps using React Native, Next.js, and NestJS. Designed microservice-based backend systems using Node.js, PostgreSQL, and Firebase, supporting real-time features, analytics pipelines, and user role management. Developed early AI-enhanced onboarding flows and smart form logic using TensorFlow.js, rule-based NLP engines, and custom ML classifiers for HR and marketing platforms. Built Web3-enabled subscription engines using Solidity, MetaMask, and Ethereum smart contracts to support decentralized identity, usage tracking, and token-based access control. Integrated Stripe and Paddle to support global recurring billing models, user-tiered access, and usage metering; developed dashboards with real-time KPIs and D3.js charts. Delivered rapid prototyping through modular design systems and reusable React components; implemented automated build and dep

Senior AI & SaaS Architect at IBM

April 1, 2025 - October 7, 2025

Led architecture and development of AI-native SaaS platforms serving enterprise teams across legal, healthcare, and finance verticals. Designed multi-agent LLM systems using LangChain, LangGraph, LangSmith, and OpenAI GPT-4 for dynamic knowledge workflows, document intelligence, and AI copilots. Developed modular SaaS architecture using Next.js, NestJS, and PostgreSQL; deployed globally via Vercel and AWS Lambda with high-availability CI/CD. Implemented advanced RAG pipelines with Pinecone, Chroma, and LlamaIndex; enhanced document recall by over 60% across large enterprise datasets. Integrated Stripe for metered billing, access tiers, and invoice automation; built real-time analytics and usage dashboards with D3.js and Supabase. Collaborated directly with product managers, AI researchers, and cloud engineers across 5+ international time zones, delivering quarterly product expansions.

Lead Mobile & Blockchain Engineer at CryptoBlock.Domains

October 1, 2023 - October 7, 2025

Led development of a cross-platform Mobile SaaS platform using React Native, Expo, and Firebase, enabling over 100K users to track vitals, receive diagnostics, and securely interact with care providers. Integrated OpenAI GPT-4, LangChain, and custom vector models to power intelligent care plan generators, multilingual triage bots, and AI-driven patient history summarization. Architected secure, HIPAA-compliant mobile infrastructure with NestJS, Node.js, and OAuth2 — including encrypted data flows, session token handling, and audit-ready logging systems. Implemented SMART on FHIR APIs, HL7 connectors, and full EMR/EHR integration for real-time health data sync. Designed provider dashboards and WebSocket-powered chat UIs with OneSignal-based push alerts, real-time vitals charts, and patient triage prioritization. Introduced Web3-enabled features such as tokenized health ID systems, private wallet auth, and patient-owned data sharing via Solidity-based smart contracts on Polygon testnet

Full Stack SaaS Engineer at Social Snowball

March 1, 2021 - October 7, 2025

Delivered over a dozen full-stack MVPs for early-stage startups in AI, health, edtech, and fintech — building scalable SaaS platforms and mobile apps using React Native, Next.js, and NestJS. Designed microservice-based backends with Node.js, PostgreSQL, and Firebase, supporting real-time features, analytics pipelines, and user role management. Developed early AI-enhanced onboarding flows and smart form logic using TensorFlow.js, rule-based NLP engines, and custom ML classifiers for HR and marketing platforms. Built Web3-enabled subscription engines with Solidity-based smart contracts to support decentralized identity, usage tracking, and token-based access control. Integrated Stripe and Paddle for global recurring billing models, and delivered dashboards with real-time KPIs. Coordinated across multiple MVP teams, mentoring junior engineers and establishing robust Git workflows and CI/CD pipelines.

Senior AI & SaaS Architect at IBM

April 1, 2025 - April 1, 2025

Led architecture and development of AI-native SaaS platforms for enterprise teams across legal, healthcare, and finance verticals. Designed multi-agent LLM systems using LangChain, LangGraph, LangSmith, and OpenAI GPT-4 for dynamic knowledge workflows, document intelligence, and AI copilots. Built modular SaaS architecture with Next.js, NestJS, and PostgreSQL; deployed globally via Vercel and AWS Lambda with CI/CD. Implemented advanced retrieval-augmented generation pipelines using Pinecone, Chroma, and LlamaIndex, improving document recall across large datasets by ~60%. Integrated Stripe for metered billing and tiered access; developed real-time analytics dashboards with D3.js and Supabase. Collaborated with product managers, AI researchers, and cloud engineers across 5+ time zones to deliver quarterly product expansions.

Lead Mobile & Blockchain Engineer at Crypto Block

October 1, 2023 - October 1, 2023

Led development of a cross-platform mobile SaaS platform using React Native, Expo, and Firebase, enabling over 100K users to track vitals, receive diagnostics, and securely interact with care providers. Integrated OpenAI GPT-4, LangChain, and custom vector models to power intelligent care plan generators, multilingual triage bots, and AI-driven patient history summarization. Architected secure, HIPAA-compliant mobile infra with NestJS, Node.js, and OAuth 2, including encrypted data flows, session token handling, and audit-ready logging systems. Implemented SMART on FHIR APIs, HL7 connectors, and real-time EMR/EHR data sync. Built provider dashboards and WebSocket-based chat UIs with push alerts and real-time vitals charts; designed patient triage prioritization flows. Introduced tokenized health IDs and private wallet authentication for patient-owned data sharing, and piloted blockchain-based audit trails using IPFS and Ethereum. Implemented offline support with SQLite, biometric login

Full Stack SaaS Engineer at Social Snowball

March 1, 2021 - March 1, 2021

Delivered over a dozen full-stack MVPs for early-stage startups in AI, health tech, edtech, and fintech — building scalable SaaS platforms and mobile apps using React Native, Next.js, and NestJS. Designed microservice-based backend systems using Node.js, PostgreSQL, and Firebase, supporting real-time features, analytics pipelines, and user role management. Built dashboards with real-time KPIs and D3.js charts. Collaborated with product managers, AI researchers, and cloud engineers across 5+ time zones, delivering quarterly product expansions.