Principal Fullstack Engineer (AI Platform & Agents)

Location: Warsaw, Poland

Company

hirify.global provides software and information solutions for professionals across health, justice, finance, and other critical industries.

What you will do

• Design and implement full-stack applications, AI agents, and platform components for rapid GenAI agent development, validation, and deployment.
• Build developer tooling, CI/CD pipelines, observability, evaluations, canary releases, and rollout/rollback capabilities.
• Apply secure SDLC, threat modeling, least-privilege access, and privacy-by-design practices.
• Use LLM patterns including RAG, retrieval, routing, tool use, and evaluations to improve reliability, safety, latency, and cost.
• Collaborate with product, UX, and domain experts to deliver measurable customer outcomes.
• Lead architecture, mentor engineers, and own larger projects from concept through production.

Requirements

• 8+ years of professional software engineering experience.
• Strong full-stack development and cloud experience with AWS, Azure, or GCP.
• Expertise in at least one of AI agent development and evaluation, backend, frontend, cloud services, CI/CD and infrastructure as code, SRE, quality engineering, or secure SDLC.
• Experience delivering secure, reliable, cloud-native systems to production.
• Strong problem-solving, ownership, and cross-functional communication skills.

Nice to have

• Experience taking AI agents from concept to production, including safety evaluations, A/B testing, and continuous improvement.
• Experience with LangChain, LangGraph, MCP, vector and RAG systems, or OpenSearch.
• Experience with traditional ML training, deployment, and monitoring.
• Understanding of LLM failure modes, fine-tuning, model adaptation, and regulatory frameworks such as SOC 2 or HIPAA.

Culture & Benefits

• Join a 100-engineer team within an established global technology company.
• Work in a high-autonomy, high-impact environment combining corporate stability with startup agility.
• Contribute to UpToDate Expert AI, a medical research and clinical reasoning agent used to support healthcare decision-making.
• Initial onboarding includes a deep dive into a platform component and delivery of small improvements during the first month.

Hiring process

• 15-minute introductory screen.
• Two live-coding interviews, a systems-design interview, and a presentation of past work.
• The process typically takes 2–4 weeks; onsite appearance at a hirify.global office may be required.