Senior Full-Stack Engineer (вакансія неактивна)

What it’s about
You’ll design and build backend-first, production-ready features for AreaButler and EstateButler — from robust API and data model design to the necessary frontend integrations. The role is full-stack, but clearly backend-leaning (roughly 70% backend, 30% frontend).
The main focus: integrating existing LLMs in a meaningful way (OpenAI, Google Gemini, Anthropic Claude, Mistral), orchestrating prompts and RAG, and stabilizing workflows. We do not train our own foundation models.

Your responsibilities

• Design, implement and maintain backend services and APIs for our core products (NestJS/Node), including background jobs and integrations.
• Take ownership of services within our monorepo (NestJS/Node, Next.js/React) — from architecture to deployment.
• LLM integration on the backend: tool/function calling, streaming, RAG (vector search), evaluation & monitoring.
• Build and maintain interfaces with CRM/automation tools (onOffice, Propstack) and other external systems.
• Design and operate data pipelines with PostgreSQL/pgvector, MongoDB, Redis, S3; ensure observability with OpenTelemetry & Sentry.
• Collaborate with frontend engineers and implement the necessary UI flows in Next.js/React to consume your APIs (without a heavy focus on complex UI/UX design).
• Ensure quality and reliability through automated testing & CI/CD (e.g. Playwright, integration tests), code reviews & mentoring.

Our tech stack (excerpt)
Frontend: Next.js, React, TypeScript, Tailwind;

Backend: Node.js/NestJS, TypeScript;

AI: OpenAI, Gemini, Claude, Mistral, LangChain/LlamaIndex, structured prompts/JSON;

Data: MongoDB, PostgreSQL/pgvector, Redis, S3;

Ops: Docker, GitLab Pipeline, Feature Flags, Sentry;

What you bring

• 5+ years of full-stack experience with a focus on backend engineering (Node.js/NestJS, API & data design), including 2+ years with TypeScript (Node + React).
• Proven experience integrating LLMs into production systems (no model training required).
• Solid architecture skills (e.g. Ports/Adapters), API design, and a strong security & GDPR mindset.
• Experience with data modeling and working with relational and NoSQL databases in real-world products.
• Comfortable working on modern React/Next.js frontends to wire up your APIs and ship complete features.

Nice to have

• Experience with Billing/Stripe, Webhooks, OAuth.
• Familiarity with prompt-engineering patterns, RAG tuning, and evaluation metrics (reliability/latency).

Framework & culture

• Languages: English.
• Work style: short communication paths, pragmatic, ship small, ship often.
• Security & privacy: GDPR compliance, PII handling, least privilege, clean logging.
• Equipment & tools: modern hardware, AI APIs, monitoring, staging/preview environments.

Sounds like your stack? Send us your application — we’d love to get in touch.