Full Stack Engineer, AI systems

BJAK; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

BJAK Warsaw is seeking a Full Stack Engineer - AI Systems to build production‑grade workflows that turn AI capabilities into practical, user‑facing features.

You will design agent operating models, handle multi‑step tasks, ensure reliability, and drive integration of LLMs, memory, and external tools with low latency.

Collaborate with ML, backend and product teams, own features from idea to production, and continuously improve observability and failure handling.

Qualifications

• Experience delivering end-to-end AI-enabled features.
• Proficiency in frontend and backend integration.
• Knowledge of LLMs, RAG, and tool integration.
• Ability to ship reliable, production-grade workflows.

Responsibilities

• Build end-to-end features across frontend, backend, and AI integrations.
• Design agent workflows for planning, failure handling, and multi-step tasks.
• Integrate LLMs and external tools with real-time performance.
• Collaborate with ML, backend and product teams to ship features.
• Improve reliability, observability, and fallback mechanisms.

Skills

Full stack engineering

System design

LLMs/RAG systems

Ambiguity management

Ownership

Fast-paced environments

Tools

Next.js

Python

Node.js

PyTorch

OpenAI/Anthropic/LLMs

SQL

NoSQL

Kubernetes

Docker

Job description

About A1

There are over 5 billion users using basic applications today such as email, notes, and tasks that are not AI-native. Our mission is to build a proactive smart assistant for everyday users to bring intelligence to conversations, errands, organising and workflows with minimal prompting.

Role

We are looking for a Full Stack Engineer - AI Systems to build the product layer that turns these capabilities into usable, production‑grade workflows. This includes designing how agents operate, fail, recover, and deliver consistent value to users.

Focus

• Build end‑to‑end product features across frontend, backend, and AI integrations
• Design agent workflows that handle planning, tool use, failure, and recovery across multiple steps
• Integrate LLMs, memory, and external tools into systems that behave reliably under real‑world conditions
• Design real‑time AI interactions with streaming, partial results, and tight latency constraints
• Improve system reliability, observability, and fallback mechanisms
• Collaborate closely with ML, backend, and product teams to ship features end‑to‑end
• Continuously iterate based on real usage and failure modes

Ideal Experiences

• Strong experience in full stack engineering (frontend + backend)
• Solid understanding of system design and API architecture
• Experience working with LLMs, RAG systems, or AI‑powered applications
• Ability to handle ambiguity and make pragmatic engineering decisions
• Strong ownership – able to take features from idea to production
• Comfort working in fast‑moving environments with evolving requirements

Outcomes

• Own and ship AI‑native product features that move beyond chat into persistent, goal‑driven workflows
• Design and deploy agent workflows that reliably complete multi‑step tasks across tools and sessions
• Reduce latency and improve responsiveness of AI interactions while maintaining output quality
• Build robust fallback and recovery mechanisms for LLM and tool failures in production environments
• Improve the success rate and reliability of AI‑driven workflows through iteration, evaluation, and monitoring
• Establish patterns and abstractions for integrating LLMs, memory, and external tools into scalable product systems
• Contribute to a product experience where AI feels proactive, consistent, and dependable over time

Tech Stack

• Next.js
• Python
• Node.js
• Pytorch
• OpenAI / Anthropic / open‑source LLMs
• SQL & NoSQL
• Kubernetes
• Docker

How We Work

The best products today in the world were built by small, world‑class teams. We are a high talent density and hands‑on team. We make decisions collectively, move at rapid speed, striking a balance between shipping high quality work and learning. Joining our team requires the ability to bring structure, exercise judgment, and execute independently. Our goal is to put in hands of our users a truly magical product.

Interview Process

If there appears to be a fit, we'll reach to schedule 3, but no more than 4 interviews. Applications are evaluated by our technical team members. Interviews will be conducted via virtual meetings and/or onsite. We value transparency and efficiency, so expect a prompt decision. If you've demonstrated the exceptional skills and mindset we're looking for, we'll extend an offer to join us. This isn't just a job offer; it's an invitation to be part of a team that's bringing AI to have practical benefits to billions globally.