Founding Engineer (RAG, AI agents, Node.js) DOIT Software $$$$

Madfish

Madfish

Software Engineering, Data Science

Ukraine

Posted on May 10, 2026

We are looking for a Founding Engineer to join a fast-growing start-up developing a product for automated lead generation and recruitment outreach.

Responsibilities:

- Autonomously architect, prototype, & build the product from the ground up.

- Develop integrations with AI (e.g. Perplexity, OpenAI) & 3rd party API (e.g. CRMs).

- Leverage your prompt engineering skills to maximize the outcome.

- Horizontally work with founders in discussions on business & product topics.

Requirements:

- 1+ years of experience in a SaaS/startup previously.

- Senior-level engineer with 5+ years of software development experience.
- Experience in RAG & AI agents development and prompt engineering.
- API development and integration experience.
- Database design and optimization (SQL).
- Development in cloud infrastructure (AWS/GCP/Azure).
- Patterns for asynchronous task processing (RabbitMQ, SQS, or similar).
- Experience with n8n/make will be a great plus.

- Authentic obsession with giving customers the best.
- Excellent verbal communication skills.

- Excellent English, strong B2 level minimum.

Job details:

  • Full-time.
  • Fully remote.
  • Long-term.
  • B2B contract.
  • Start date — ideally ASAP / by mid-April.
  • Also, you will get founding member equity % in addition to your fixed salary.

What else will you get:

- Learning how a startup grows.

- Direct impact on product and company strategy.

- Deliver value directly to paying B2B clients.

- Opportunity to build and lead a team and department.

- You will work with the most modern toolset (including Cursor in Agent mode).

The hiring process:

  • 45 min pre-screen interview with a recruitment manager
  • 15-30 min call with the client
  • a technical deep-dive interview, most likely with online coding (conducted by client)
  • online call with the team or key team members