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CallstackCA

Senior AI System Engineer

Callstack is a software development consultancy specializing in React and React Native, offering expertise in cross-platform application development and contributing significantly to the open-source community.

Callstack

Employee count: 51-200

Poland only

Callstack was founded in 2016 byMike GrabowskiandAnna 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!

Callstack also organizesReact Universe Conf- the only community- driven and fully dedicated to React Native conference in Europe.

What is unique about working at Callstack?

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

  • You can develop your own ideas inour R&D program. If you want to bring your visions to life - Callstack will support you.

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

  • There are plenty of possibilities to showcase your expertise: You can speak at ourReact Universe Conf, be featured in our blog, orReact Universe On Airepisode.

  • 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 Ph. 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

You are the right candidate if you are:

  • A seasoned AI/ML engineer with proven track record designing and shipping production AI systems (LLMs, NLP, computer vision, or multi-modal)

  • Have 10+ 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

  • Good communicator in English (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 :)

Why work with us? Because you can:

  • Realize your potential in our R&D program

  • Work on software used by millions

  • Take part in our Open Source projects

  • Grow in your unique expert role

  • Code with the top experts and community leaders

  • Showcase your expertise by speaking at our conference, being featured in our blog or podcast episode

  • Co-create and shape core technology

  • Join the React Native community

  • Develop soft skills

What we offer:

  • 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

  • Possibility to participate in React Universe Conf

About the job

Apply before

Posted on

Job type

Full Time

Experience level

Senior

Location requirements

Hiring timezones

Poland +/- 0 hours

About Callstack

Learn more about Callstack and their company culture.

View company profile

At the heart of Callstack is a culture deeply rooted in the open-source community and a passion for pushing the boundaries of what's possible with React and React Native. Founded in 2016, just as React Native was emerging, the company has grown from a small startup into a global leader in cross-platform development. This journey has been driven by a team of dedicated experts who are not just users of technology, but active contributors and shapers of the React ecosystem. The company’s ethos is built on collaboration, knowledge-sharing, and a relentless pursuit of excellence. Team members are encouraged to become thought leaders, sharing their expertise through blog posts, podcasts, and at international conferences, including Callstack's own React Universe Conf.

The work environment at Callstack is designed to foster innovation and personal growth. With a remote-first approach, the company attracts top talent from around the world, creating a diverse and dynamic team. This global perspective is complemented by a strong sense of community and mutual support. Employees are empowered to work on challenging projects for top-tier companies, including those in the Fortune 500, while also having the opportunity to contribute to impactful open-source projects. Callstack provides a nurturing environment where developers can thrive, offering resources for self-development, mentorship programs, and the freedom to explore new ideas through an R&D program. The belief that people are the cornerstone of success is evident in the supportive and collaborative atmosphere that permeates every aspect of the company.

Employee benefits

Learn about the employee benefits and perks provided at Callstack.

View benefits

Monthly lunch allowance

A monthly allowance for lunches.

Top-notch hardware - Apple devices

Provision of Apple devices for work.

24 paid days off

24 paid days off for B2B contractors.

Private healthcare

Private healthcare for you and your family.

View Callstack's employee benefits
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Callstack

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