HR Manager

We don’t follow best practices, we set them!

Callstack supports and inspires top industry leaders to ship better digital products and services to their users. We are a team of high-level experts in cross-platform development and consultancy. We co-create the technology, collaborate with the Meta team on setting the direction for the future growth of the React Native framework, and much more!

We are recognized in the React Native Community as contributors to Open Source projects, organizers of React Universe Conf, as well as speakers at international conferences. We also organize regular community meetups in our HQ in Wrocław, Poland.

We truly believe that you can get the best out of people when you give them a chance to participate and develop. At Callstack you are the one to decide in which area you want to grow, you’ll have an individual self-development budget to empower your competencies and gain new skills. Our goal is to allow every employee to speak up and introduce their ideas to build the future together.

The HR Manager will lead a strong, well-established team with potential for further organic growth, aligning with the company’s scaling plans.

But this is not your typical HR role. We’re looking for someone who lives and breathes HR — a visionary builder who wants to take culture, people experience, and organizational design to interstellar levels.

Your mission: to shape an engaged, high-performing, and cohesive organizational culture that supports Callstack’s dynamic growth through world-class HR Business Partnering, Learning & Development, HR Operations, and Employer Branding. This is a rare opportunity to go all-in on HR innovation — to design systems, frameworks, and people programs that will set new standards for how a global tech company empowers and grows its people.

If you’ve ever felt limited by bureaucracy, budget, caution, or mediocrity — search no more. Here, you’ll have the space, trust, and support to push boundaries, experiment boldly, and build the kind of workplace culture that ends up featured in Harvard Business Review or Wired.

Join us and play a pivotal role in supporting Callstack through its next phase of rapid growth. We’re entering an ambitious scaling phase — and we’re doubling down on HR as a true strategic engine of success. We’re already proud of what we’ve built: a strong culture, high engagement, and exceptional people. But we’re not stopping there — we want to become the benchmark for how HR can shape an extraordinary company. Join us — and make HR history.

As HR Manager you will be responsible for:

HR Strategy & Business Partnership

• Co-create and execute an HR strategy aligned with business goals.

• Ensure consistency and quality of HR policies and processes across the company.

• Act as a strategic partner to managers and key stakeholders on workforce planning, team development, succession, and organizational effectiveness.

• Advise the Executive Board and managers on people-related issues, labor law, and HR best practices.

  
  

HR Operations & Compliance

• Coordinate administrative HR processes dedicated to our Polish and international employees.

• Collaborate with Finance and external legal advisors to ensure compliance.

• Prepare HR reports and analytics for management - including retention, eNPS, turnover, and headcount metrics.

HR Business Partner Team

• Lead the HR Business Partner team, overseeing collaboration with departments, and managing performance, feedback, promotions, and headcount planning.

• Support HRBPs in their advisory role for managers.

• Foster a culture of feedback, diversity, inclusion, and well-being.

• Oversee and improve employee lifecycle processes from onboarding to offboarding.

• Drive standardization of appraisal and salary review processes to ensure fairness, transparency, and alignment with business goals.

• Maintain and develop an HR knowledge base with accessible, up-to-date resources and best practices.

• Shape and enhance remote/hybrid work frameworks, including tools and workflows for effective collaboration and engagement across distributed teams.

L&D and EB areas:

• Manage and support the design and implementation of company-wide competency development programs (management training, career paths, and skills development).

• Promote knowledge sharing and internal learning initiatives.

• Help shape and oversee our Employer Branding strategy - including external communication, media presence, and collaboration with the recruitment team.

• Manage the evolution of our EVP and communication materials.

Key Objectives & Success Indicators (KPI / OKR)

• Growth in Employee NPS / employee satisfaction levels.

• Positive retention trends and reduced voluntary turnover.

• Implementation and measurable impact of development programs

• Increased employer brand visibility

• Improved HR Business Partnering efficiency - growing quality of hires through closer cooperation with recruitment in analyzing and understanding employee performance and offboarding metrics.

• High compliance with local and international HR regulations, with no critical audit issues.

You are the right candidate if you have:

Experience

• Minimum 6 years of HR experience, including at least 3 years in a leadership role.

• Proven experience and track record in dynamic, highly scalable environments (preferably in IT/tech sector) - mandatory.

• Hands-on experience working in international and remote settings.

• Demonstrated success in creating HR strategy, company-wide HR processes, leadership development, and strong positive influence on organizational culture.

Competencies

• Balance strong business acumen with a people-first, strategic HR Business Partner mindset, covering talent, performance, engagement, learning, and organizational design.

• Demonstrate strong management, collaboration, and negotiation skills.

• Exhibit a proactive attitude and clear communication.

• Apply a must-have data-driven mindset – you think, speak, and act based on data, turning insights into better people and business decisions.

• Use flexible problem-solving focused on optimal outcomes.

• Drive innovation and operational excellence consistently.

• Be proficient in modern HR tools for performance, engagement, and feedback management (e.g., review systems, pulse surveys, analytics platforms).

• Fluent level of English (C1 level)

Education (preferred)

• Higher education in HR Management, Psychology, Business Administration, Economics, or related fields.

• Nice to have:

• HR certifications (e.g., CIPD, SHRM, HRCI, ACC/ICC coaching) are an additional asset.

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