Senior Full-Stack AI Developer (Freelancer, Remote)

plug&Hire; Deutschland; Remote; EUR 90.000 - 150.000; Vollzeit

Zusammenfassung

plug&Hire is building the next generation of AI-driven recruiting infrastructure. A funded startup in Stuttgart, we are hiring a Senior AI Full-Stack Developer (backend focus) to research ideas and deliver production-ready implementations with minimal oversight.

The role is Full-time, remote and Europe-based, with strong emphasis on AI workflows and real-time automation. We expect 5+ years of experience, deep TypeScript skills, and hands-on work with OpenAI SDK, STT/TTS, and API integrations.

Qualifikationen

• 5+ years of professional software development.
• Expert TypeScript with strong type-safety practices.
• RESTful API design and third-party integrations (webhooks, SDKs).
• Testing discipline: Unit, integration, e2e tests with maintained coverage.
• Git proficiency with clean commit history.
• Understanding of LLM workflows (prompts, context, tokens, streaming).
• Speech-to-Text and Text-to-Speech integration patterns.
• OpenAI SDK experience: Chat completions, function calling, streaming.

Kenntnisse

5+ years experience

TypeScript expert

RESTful APIs

Testing discipline

Git proficiency

LLM workflows

STT/TTS integration

OpenAI SDK

AI observability (Langfuse)

Tools

Vue 3

Vite

Pinia

Stripe payments

pg-boss / Bull

Docker

Fly.io

Python

Jobbeschreibung

We are building the infrastructure for the next generation of AI-driven recruiting.

While others are still just talking about AI, we have long since put it to work:

Our AI agents conduct calls with thousands of candidates every day—qualifying them, scheduling appointments, and managing entire recruitment processes—fully automatically and in real time. At Plug&Hire, we are building the infrastructure for the next generation of recruiting.

We are a team of experienced, successful founders, and we are hiring for our latest, funded startup in Stuttgart.

The Role

Senior AI Full-Stack Developer (backend focus). Autonomous AI Software Engineer who can take an idea, research, and deliver production-ready implementations with minimal oversight.

Level: Senior | Freelancer | Type: Full-time | Location: Remote, Europe based

Requirements

Technical Skills

• 5+ years professional software development
• Expert TypeScript with strong type-safety practices
• RESTful API design and third-party integrations (webhooks, SDKs)
• Testing discipline: Unit, integration, e2e tests with maintained coverage
• Git proficiency with clean commit history
• Conceptual understanding of LLM workflows (prompts, context, tokens, streaming)
• Speech-to-Text (STT) and Text-to-Speech (TTS) integration patterns
• OpenAI SDK experience: Chat completions, function calling, streaming responses
• AI workflow debugging: Understanding LLM observability and tracing (e.g., Langfuse)

AI-Assisted Coding (Required)

• AI coding approach (GitHub Copilot, Cursor, Claude Code, or similar)
• Comfortable using AI tools to accelerate development while maintaining code quality
• Understanding when to trust AI suggestions vs. manual verification
• Ability to oversee and control code changes, setting clear and effective guidlines
• Ability to write effective prompts

Nice to Have

• Vue 3 (Composition API, TypeScript), Vite, Element Plus, Pinia
• Stripe or payment processing
• Background job processing (pg-boss, Bull, BullMQ)
• Docker & container orchestration
• Fly.io or similar PaaS deployment
• Python experience (some services for RAG ingestion and retrieval are written in Python)

Soft Skills

• Autonomous: Self-directed research and problem-solving Owner
• mindset: Features from conception to production
• Quality-focused: Maintainability over quick fixes Clear