Event Manager

Salary:13 500 - 17 000 PLNnet + VAT (B2B)

Callstack is a cross-platform and AI-native technology company working with some of the world’s leading brands to build better digital products and services.

We’re known for pushing the React Native ecosystem forward - from co-founding the React Foundation and contributing to Open Source to organizing React Universe Conf, Agent Conf, and community events around the world.

But Callstack is built by more than great engineers. Behind our technology is a team of people shaping how we grow, work with clients, build our brand, and create new opportunities.

We give people the space to take ownership, bring ideas to the table, and make a real impact on how the company evolves. As Callstack grows into new technologies, markets, and ways of working, you’ll have the opportunity to grow with it.

Join us and take the next step with Callstack!

Currently, we are looking for an Event Manager who will take ownership of planning and delivering Callstack’s conferences, combining great participant experiences with effective promotion, ticket sales and budget management.

At Callstack, events bring us together with the people building the future of software. Our portfolio includes React Universe Conf, which welcomed 500 attendees in 2025, and Agent Conf, focused on AI and agentic development. We also co-hosted React Conf 2024 with Meta and the React team, bringing together 600+ in-person attendees and over 250,000 online.

Alongside conferences, we organise and co-host meetups in cities such as San Francisco, New York, Amsterdam, Warsaw, Wrocław and more. You’ll help shape and grow this international programme, with a particular focus on the US, followed by Europe, including Poland. It’s an opportunity to work directly with technology partners, speakers and communities, build new partnerships, and turn valuable conversations into relationships with future Callstack clients.

As an Event Manager you will:

• Plan and deliver in-person, hybrid and virtual conferences from concept to completion.

• Own event timelines, logistics and technical production, coordinating venues, suppliers and external agencies.

• Coordinate conference programmes with our Technology Team and support speakers throughout their participation.

• Manage conference budgets, revenue forecasts, costs and settlements.

• Take ownership of ticket sales, including pricing proposals, sales targets, registration platforms and attendee communication.

• Develop and execute conference promotion plans together with our Marketing and Growth Teams.

• Monitor ticket sales and campaign performance, adjusting activities to achieve attendance and revenue goals.

• Negotiate with suppliers and coordinate contracts with legal advisers.

• Ensure a smooth, inclusive experience for participants and speakers, resolving operational issues during events.

• Evaluate conference results and participant feedback to improve future editions.

Requirements

You are the right candidate if you have:

• Proven experience organising and co-hosting international technology events, including meetups and partner events; experience in the US market is particularly valuable.

• Strong project management skills and the ability to coordinate multiple timelines, suppliers and stakeholders.

• A track record of securing sponsors and partnerships, and working with Sales and Marketing to generate qualified leads and sales opportunities.

• Practical experience using CRM and reporting tools to track event leads, follow- up and commercial outcomes.

• Experience managing event budgets, controlling costs and reporting financial results.

• Practical experience with ticket sales, registration platforms and attendee communication.

• Experience coordinating event promotion and working with marketing teams.

• Confidence using event management platforms, spreadsheets and analytics to monitor performance.

• Strong relationship-building and communication skills, with experience coordinating international partners, sponsors, co-hosts, speakers and suppliers, aligning expectations and negotiating commitments across organisations and time zones.

• Attention to detail and a proactive approach to solving problems.

• Ability to stay calm, make decisions and adapt quickly during live events.

• Great English skills, both written and spoken, at C1 level or above.

• Availability for occasional international travel.

Nice to have:

• Familiarity with React Native and software developer audiences.

• Experience delivering hybrid or virtual events.

• Familiarity with CRM and marketing analytics tools, such as HubSpot and Google Analytics.

What we offer:

• 24 paid days off & 30 days paid sick leave

• 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

• 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