Founding AI Engineer for Agentic AI — Equity + Impact

Cross Border Talents; Kraków; On-site; PLN 369,000 - 443,000; Full time

Benefits offered by this job

1–2% equity

Job summary

TechTree's client is hiring a Founding Engineer to join an early technical team in Warsaw, building next-generation AI agents and products. This high-ownership role is ideal for someone who has shipped AI agents into production and wants to influence both product and technical foundations.

You will own critical infrastructure, drive architecture decisions, and work directly with a founding team to scale a startup.

Qualifications

• Proven experience shipping AI agents to production.
• Experience building B2C products used by real customers.
• Strong understanding of agent observability, evaluation, reliability, and cost management.

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 product experience

Agent observability & reliability

Founder/early startup experience

System design fundamentals

TypeScript & cloud tooling

Polish & English fluency

Job description

TechTree's client is hiring a Founding Engineer to join an early technical team in Warsaw, building next-generation AI agents and products. This high-ownership role is ideal for someone who has shipped AI agents into production and wants to influence both product and technical foundations.

You will own critical infrastructure, drive architecture decisions, and work directly with a founding team to scale a startup.