Aleksandr B.

🚀 Senior fullstack engineer with 5+ years building production web and mobile apps, AI-powered workflows, GTM systems, and operational infrastructure in Next.js, React, and Node — including AI features powered by Claude and OpenAI. I ship clean, fast, well-tested products from zero to deploy and stay on to make them better. ✅ Top Rated · 100% Job Success · 5★ on every completed contract · EU timezone 🛠 What I build: • Web apps in Next.js / React with TypeScript, Tailwind, and ShadCN for SaaS, AI, CRM, and GTM platforms • Mobile apps in React Native + Expo (sharing logic with the web) • APIs and backend services in Node, Nest.js, and Express • CRM integrations, webhook systems, and API orchestration for GTM workflows • HighLevel (GHL) API integrations, automations, custom workflows, and lead-management systems • AI-powered outbound workflows, operational automation, and internal tooling • Data layers in PostgreSQL, GraphQL, Redis, Prisma, and TypeORM • AI features inside production apps, business workflows, and operational automation — Claude, ChatGPT, OpenAI, automation • End-to-end delivery: architecture → implementation → deployment → monitoring on Vercel • Consultation on AI workflows, product architecture, API integrations, and scalable operational systems 🤖 AI & agent engineering: • LLM app development (Claude, OpenAI, Anthropic API) • Prompt design, tool-calling, and GTM automation workflows • AI-powered sales, CRM, onboarding, and support automations • Agent orchestration, outbound automation, and multi-step business workflows • Retrieval-augmented generation (RAG), embeddings, vector search, and memory design • Evaluation pipelines, guardrails, observability, and production safety • AI consulting for startups building AI-native products and automation systems • OpenClaw: agent configuration, skill development in JS/TS, sandbox & tool permission design, multi-channel bot deployment, model/provider configuration 🧱 Recent work: • Built a multi-app Nx monorepo with interconnected web and mobile apps • Designed and shipped tool-calling AI agents on OpenClaw with custom skills, sandboxed tool permissions, and multi-channel deployment • Built API-driven CRM automations and operational workflows for startup teams • Integrated third-party APIs, webhook pipelines, and automation systems across SaaS products • Built an AI blog generator that writes posts and auto-publishes to a CMS • Implemented a RAG pipeline with retrieval, memory, embeddings, and evaluation guardrails for a production AI feature • Built AI-assisted automation workflows and operational systems for startup teams • Fixed a tricky React Native Expo image-flashing bug other devs had stalled on • Shipped an interactive healthcare CRM for managing doctor schedules • Contributed to a complex EU marketplace for buying and selling businesses • Built a reusable admin-page and internal tooling library powering multiple client products • Refactored open-source canvas npm packages to add custom shapes • Cut visual bugs 3× by introducing visual regression testing in CI ⚙️ Stack Frontend: React · Next.js · TypeScript · Tailwind · ShadCN · Vue State: Zustand · Redux · MobX Mobile: React Native · Expo Backend: Node · Nest.js · Express · GraphQL · REST APIs · Webhooks Data: PostgreSQL · Redis · Prisma · TypeORM · Vector Databases AI & Agents: Claude · Claude Code · OpenAI API · ChatGPT · OpenClaw · LLM apps · Tool calling · RAG · Embeddings · Agent orchestration · Evals & guardrails · Automation · AI workflows CRM & GTM: HighLevel (GHL) · CRM Automation · GTM Engineering · Revenue Automation · Sales Automation · Lead Workflows · API Integrations · Operational Systems · Growth Systems · AI Consulting DevOps: Vercel · GitHub Actions · Sentry · Datadog Tooling: Vite · Storybook · Penpot · Neovim · Apache Superset · Conductor · OpenClaw 👤 How I work Detail-oriented, async-friendly, EU timezone, English C1. I write code I'd be happy to maintain a year later, ship on schedule, and reply within hours. I also use modern AI dev tools (Claude Code, ChatGPT) to move faster without cutting corners on quality. 💪 Key strengths • Senior expertise in Next.js, React, Nest.js, API architecture, and scalable GTM systems • Strong experience integrating CRMs, APIs, automation workflows, and operational tooling • Web + mobile from one engineer (React Native + Expo) • Real LLM, AI automation, and agent engineering experience — tool-calling, RAG, evals, sandboxing, multi-channel deployment • Strong consulting mindset focused on scalable systems, automation, and business efficiency 📩 Tell me about your project, API integration, AI workflow, CRM automation, or growth challenges — I'll give you an honest take on scope, trade-offs, and how I'd build it.