Senior AI System Engineer

Callstack was founded in 2016 by Mike Grabowski and Anna Lankauf. Our company provides top cross-platform consultancy & development in React.js and React Native. We co-create the technology and collaborate with the Meta team on shaping the technology as core contributors and innovators.

Our main goal is to drive and accelerate software development innovation. To achieve that, we follow our major rule:

We don’t follow best practices. We set them!

What is unique about working at Callstack?

• You will work with the best React Native experts on applications used by millions worldwide.

• You have a possibility to contribute to our projects in Open Source like React Native Paper, Linaria, RN Testing Library etc.

• There are plenty of possibilities to showcase your expertise: You can speak at our conference, be featured in our blog, or React Universe On Air episode.

• You are the one to decide in which area you want to grow, you’ll have an individual self-development budget to upgrade your soft skills, managing skills or become a Mentor in the future.

Join us and work with the TOP Silicon Valley and Fortune 500 companies in the USA!

As a Senior AI System Engineer you will:

• 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