Lengin

Full-Stack Developer (AI-focused, growth to Tech Lead)

We’re looking for a Full-Stack Developer who’s ready to grow into an AI Solution Tech Lead within the next 6 months. You won’t just write code — you’ll work hands-on with AI frameworks, agents, LLM tools, and bleeding-edge technologies, building prototypes for client presales, solving complex technical challenges, and driving tasks to completion even when the brief is incomplete and deadlines are tight.
 

💡 This position is open exclusively to Ukrainian professionals, regardless of their current country of residence.
 

You’re the one if you:

  • Can quickly dive into new technologies and apply them hands-on.
  • Love experimenting with AI agents, prompt engineering, and the latest tools (OpenAI, Anthropic, LangChain, LlamaIndex, Hugging Face, etc.).
  • Find creative solutions independently and deliver results without waiting for perfect specs.
  • Communicate clearly with both the team and clients.
  • Hold high standards for your work and always look for ways to make things smarter and cleaner.
     

What you’ll do:

  • Build full-stack + AI prototypes (MVPs/PoCs) for clients under tight deadlines.
  • Integrate LLMs and AI frameworks into real business use cases (chatbots, automation, search, data enrichment, etc.).
  • Work hands-on with vector databases, embeddings, RAG pipelines, and multimodal models.
  • Solve complex technical challenges and find creative ways to turn abstract ideas into working solutions.
  • Collaborate on solution architecture and contribute to technical decision-making.
  • Participate in presales, showcasing your prototypes and ideas to clients.
  • Grow step-by-step into a Tech Lead role, taking ownership of AI-driven projects and mentoring others.
     

What we expect:

  • 4+ years of experience in full-stack development (Python + React/Next.js).
  • Practical experience or strong curiosity in AI/ML frameworks (LangChain, PyTorch, TensorFlow, Hugging Face, LlamaIndex, or similar).
  • Understanding of cloud environments (AWS, GCP, Azure).
  • Ability to learn fast and stay on top of new AI tools and trends (OpenAI APIs, Anthropic Claude, Ollama, Mistral, etc.).
  • English: B2+
     

What we offer:

  • Work on projects at the intersection of AI and business, where your impact is real.
  • Freedom to choose technical solutions and implement new approaches.
  • A high-standards team that values initiative, ownership, and innovation.
  • Flexible schedule and projects that will level up your skills faster than any course.

Required languages

English B2 - Upper Intermediate
Ukrainian Native
Published 15 October · Updated 11 November
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