I’m Constantin, a senior full‑stack engineer and AI/SaaS builder helping US service businesses automate work and get more profit from every lead. Based in Glendale/LA, I mostly work with home services (HVAC, plumbing, handyman), transportation (limo, shuttle), and other service companies.
Instead of “just a website”, I build complete systems that actually make you money:
- AI voice agents for inbound/outbound calls: answering, qualifying, booking, reminders, and follow‑ups.
- Full call automation using Retell AI, custom LLMs, and modern telephony APIs (Twilio, Plivo, etc.).
- CRM and workflow automation: statuses, tasks, notifications, estimates, invoices, and reporting.
- High‑converting landing pages ready for Google Ads and Facebook/Instagram traffic.
- SaaS platforms (MVP to production) with Stripe subscriptions, multi‑tenant logic, and role‑based access.
Technologies and tools I actively use:
- TypeScript, JavaScript, React, Next.js, Node.js, Python, SQL/PostgreSQL.
- Supabase, Firebase, Redis, background workers and queues for automation.
- Stripe, OpenRouter, Retell AI, Twilio, WhatsApp/Telegram/Instagram APIs, Google APIs.
- Facebook/Instagram Business Suite, CRM systems, and integration with third‑party tools (HousePro, Thumbtack, and similar platforms).
I don’t just “code features” I design and implement end‑to‑end solutions: from idea and MVP to live product used by real customers, including integration into your existing processes and team onboarding. I’m comfortable working as a contractor, part‑time, or on a project basis remote or on‑site in the LA area.
If you need someone who can both architect the system and actually build, integrate, and optimize it for your business, email or call me I’m open to new projects and long‑term cooperation.