Founding Engineer

C&D Talent Advisory; Poznań; On-site; PLN 372,000 - 447,000; Full time

Job summary

TechTree's client is hiring a Founding Engineer to join an early technical team building next-generation agentic AI products in Warsaw. This role offers high ownership and autonomy to shape both product and technical foundation.

The ideal candidate has shipped AI agents to production, built B2C products, and thrives in a fast-paced startup environment with significant equity and impact.

Qualifications

• Shipping AI agents to production is required.
• Experience shipping B2C products used by customers.
• Startup environment and founder/early engineer background preferred.
• Strong system design and software engineering fundamentals.
• Fluent Polish and English are required.

Responsibilities

• Build and scale production-grade agentic AI systems.
• Design infrastructure for reliable AI-agent execution at scale.
• Develop agent observability, evaluation, and benchmarking systems.
• Improve reliability, latency, and cost efficiency across large-scale LLM workflows.
• Build state-of-the-art agentic product experiences.
• Create and maintain integrations with third-party platforms and tools.
• Make architectural and product decisions with significant autonomy.
• Shape engineering standards and technical direction as an early team member.

Skills

Shipping AI agents to production

B2C products

Agent observability

System design

TypeScript

Cloud infrastructure

AI tooling

Polish & English

Tools

Observability tooling

LLM tooling

Job description

This is a role that TechTree is recruiting for on behalf of one of its clients.

TechTree is an AI-driven recruitment platform working with high-growth companies.

When you apply, TechTree's AI Agent matches you not just to this role, but to other relevant opportunities across its network, so one application can unlock multiple roles.

Founding Engineer | Agentic AI | Warsaw

TechTree's client is hiring a Founding Engineer to join one of the earliest technical teams building next-generation AI agents and personal AI products from the ground up.

This is a high-ownership opportunity for an exceptional engineer or former founder who has already shipped AI agents into production and wants to help shape both the product and technical foundation of an ambitious early-stage company.

• Location: Warsaw, Poland
• Work model: On-site
• Employment: Full-time
• Compensation: $100,000–$120,000/year + 1–2% equity
• Level: Mid-Senior / Senior

What you'll work on

• Build and scale production-grade agentic AI systems
• Design infrastructure for reliable AI-agent execution at scale
• Develop agent observability, evaluation, and benchmarking systems
• Improve reliability, latency, and cost efficiency across large-scale LLM workflows
• Build state-of-the-art agentic product experiences
• Create and maintain integrations with third-party platforms and tools
• Make architectural and product decisions with significant autonomy
• Shape engineering standards and technical direction as an early team member

What we're looking for

• Proven experience shipping AI agents to production, not just prototypes
• Experience building B2C products used by real customers
• Strong understanding of agent observability, evaluation, reliability, and cost management
• Previous experience as a founder, founding engineer, or early engineer at a fast-moving startup
• Strong system-design and software-engineering fundamentals
• Comfortable working with modern TypeScript, cloud infrastructure, and AI tooling
• Fluent Polish and English
• Based in Warsaw or genuinely willing to relocate
• Comfortable with a highly ambitious, fast-paced, ownership-driven startup environment

Strong advantages

• Previous experience founding a technology company
• International study or work experience
• Combination of top-tier technology-company and early-stage startup experience
• Experience scaling AI products to significant user volumes
• Strong product instincts alongside technical depth

Why consider this opportunity?

• Join at the founding-engineer stage
• Build core AI technology from the ground up
• Significant influence over product and architecture
• 1–2% meaningful equity ownership
• Work directly with an experienced founding team
• Opportunity to grow into technical leadership as the company scales