Senior AI System Engineer

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Callstack

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2016

🤝 B2B

B2B • Software Engineering

Callstack is a leading software engineering consultancy that specializes in app development and technological transformation using React and React Native. They provide end-to-end product development services including mobile and web app development, app performance optimization, and tech stack upgrades. Their expertise in the React ecosystem makes them a trusted partner for companies looking to enhance and innovate their software solutions. Callstack also focuses on educating and upskilling development teams, enabling organizations to stay competitive and efficient.

📋 Description

• Act as a trusted AI architect & consultant for our enterprise clients, helping them turn ambitious ideas into robust, production-ready solutions across cloud, edge, and on-prem environments • Design and own end-to-end LLM & multi-agent architectures - from vector-based RAG pipelines and document-processing workflows to multi-agent orchestration and autonomous decision frameworks • Create and publish libraries utilizing local on-device models • Create and publish design papers on behalf of the company together with our R&D team • Build cloud-native AI infrastructure on AWS or equivalent on Cloudflare / GCP with security, governance, and cost optimization baked in • Define and implement AI governance & monitoring (bias detection, drift tracking, compliance reporting) to keep models accurate, explainable, and audit-ready • Evaluate, benchmark, and create custom models - open-source and commercial • Contribute to the open-source community through internal R&D initiatives • Stay one step ahead by experimenting with the “next big thing” in AI • Mentor and inspire engineers around you, sharing knowledge through tech talks, code reviews, and architectural workshops

🎯 Requirements

• A seasoned AI/ML engineer with proven track record designing and shipping production AI systems (LLMs, NLP, computer vision, or multi-modal) • Have 7+ years of experience in Software Engineering • Bachelor's Degree, Master's Degree or Ph. D in Computer Science, Data Science, Artificial Intelligence, or a related field • Fluent in Python and comfortable with TypeScript • Skilled at vector search & RAG pipelines and understand embedding selection, chunking, and retrieval tuning • Comfortable designing multi-agent orchestration • Understand AI governance, security, and MLOps • Data-driven - you benchmark, profile, and optimize everything from prompt tokens to GPU utilization • Open-source minded - public GitHub contributions, conference talks, or community forum activity are huge pluses • Fluent communicator in English (min. B2+), able to explain complex concepts to technical and non-technical stakeholders • Proactive, self-driven, and a team player who loves sharing knowledge and elevating those around you • Fun to work with :)

🏖️ Benefits

• 24 paid days off & 30 days paid sick leave for B2B contractors • Fully-covered life insurance • Private healthcare for you and your family • Free access to mental health platform - Helping Hand • Multisport Card or monthly allowance for other sports activities • Individual Wellbeing & Development Budget • Monthly lunch allowance • Accounting costs refund for B2B contractors • Flexible working hours and fully remote work possibility • Cool office in Wrocław city center • Magnificent team events and activities • Company-wide workation and team building workshops • Top-notch hardware - Apple devices