Backend Engineer AI – Inference & Orchestration at Scale

BJAK; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Job summary

BJAK is seeking a Backend Engineer, AI, to own the inference and orchestration layer powering AI interactions. You will build and operate production-grade APIs used across mobile and desktop clients, focusing on latency, correctness, reliability, and cost.

You will work with Python/NodeJs stacks, PyTorch and various LLMs, ensuring scalable, observable systems and robust production practices. Warszawa-based role with potential hybrid collaboration.

Qualifications

• Strong backend engineering fundamentals in production environments.
• Experience running high-throughput, low-latency services.
• Familiarity with AI inference patterns (LLMs, embeddings, multimodal).
• Comfortable debugging distributed systems under load.
• Bias toward shipping and learning from production behavior.

Responsibilities

• Build and operate backend systems that serve AI-powered features in production.
• Design inference pipelines, orchestration layers, and service boundaries around models.
• Own production concerns: monitoring, logging, alerting, and incident response.
• Optimize latency and throughput across inference, caching, batching, and streaming.

Job description

BJAK is seeking a Backend Engineer, AI, to own the inference and orchestration layer powering AI interactions. You will build and operate production-grade APIs used across mobile and desktop clients, focusing on latency, correctness, reliability, and cost.

You will work with Python/NodeJs stacks, PyTorch and various LLMs, ensuring scalable, observable systems and robust production practices. Warszawa-based role with potential hybrid collaboration.