Staff Frontend Engineer (TypeScript, React)

SentinelOne

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Location: Czech Republic, Slovakia
Job Type: full-time
Work Format: 🌍 Remote
Salary: Not specified
Posted: October 3, 2026

Job Description

Our Purpose

At SentinelOne, we are driven by a clear purpose: to give the advantage to those who secure our future. As AI reshapes how organizations build, operate, and innovate, the responsibility to protect them becomes more critical than ever. When you join SentinelOne, your work helps protect global enterprises, critical infrastructure, and the technologies shaping tomorrow. If you are motivated by meaningful challenges and want your impact to be real, measurable, and global, you will find purpose here.

About Us

SentinelOne is a company at the intersection of AI and security, pioneering a new operating model for cybersecurity. Our AI-native platform unifies protection across endpoint, cloud, identity, data, and AI systems to deliver autonomous detection and response with clarity and speed. By combining real-time analytics, intelligent automation, and a unified data foundation, we reduce noise, simplify complexity, and empower security teams to focus on what truly matters.

Our teams are builders, problem-solvers, and innovators committed to shaping the future of security. If you are excited to solve hard problems alongside talented, mission-driven people, we invite you to help us build a safer future for humanity.

What Are We Looking For?

We’re looking for people who are relentlessly curious and committed to continuous learning. AI is reshaping every function across our business, and we enable every team member, regardless of role or level, to build fluency in AI tools and concepts. Those who thrive here actively seek out new solutions, experiment thoughtfully, and apply what they learn to drive better, faster, smarter outcomes.

As a Staff Frontend Engineer you'll be responsible for developing new functionalities for the Singularity Data-Lake products, which process several Petabytes of data daily. If you are a versatile engineer with a sharp product sensibility, you'll have remarkable opportunities to directly influence how our customers utilize our platform for threat hunting and building cutting-edge threat intelligence solutions. Our roadmap includes an array of exciting new functionalities, adding advanced AI capabilities, and ambitious cost and performance objectives to efficiently process vast amounts of data, all to the advantage of our customers. Our mission is to elevate our Singularity Data-Lake security applications portfolio by introducing leading-edge solutions and features.

What Will You Do?

Primary responsibilities include:

Software Development (70-80% of the time)
Formulate and review technical specifications
Work with the Product Manager to define specifications and refine work
Enhance the quality, stability, and security of the entire team's codebase
Conduct code reviews
Assist team members in problem-solving, offer constructive feedback, and participate in daily scrum standups

What Skills and Knowledge Will You Bring?

Ideal candidates will have:

Proficiency in development projects in TypeScript and React
Familiarity with AI tools
Experience with GraphQL and REST
Ability to swiftly delve into new products and comprehend their inner workings
Capacity to collaborate effectively with both local and remote teams across various time zones
Demonstrated technical leadership experience, shaping best practices and driving their adoption
Excellent communication skills, as you'll regularly liaise with product and other engineering teams

Why SentinelOne?

AI is redefining how the world operates and rewriting the rules of security in real time, and SentinelOne was built for this moment. From day one, we architected an AI-native platform designed to operate at machine speed, not as an add-on to legacy systems but as the foundation itself. If you want to build where innovation and impact move together, this is that place.

We invest in our Sentinels with comprehensive, competitive benefits designed to support you and your family:

Equity & Rewards

Restricted Stock Units (RSUs)
Employee Stock Purchase Plan (ESPP)
Performance-based bonus

Time Off & Wellbeing

Flexible time off, on top of the standard 5 weeks PTO
Paid company wellness days and fully paid short-term sick/nursing leave
Gender-neutral parental leave

Insurance & Financial Security

Private medical care benefit
Life and disability insurance
Pension Insurance contribution
Global business travel medical insurance
Employee Assistance Program (EAP)

Work Perks & Flexibility

Global home office allowance
Meal allowance
Hybrid work in Prague (Karlin), Brno (Clubco) or remote in CZ/SK. Only Prague-based employees are required to work from the office at least 2 days//week.

Wellness & Lifestyle

Wellbeing allowance
MultiSport benefit program
Wellness Coach app

SentinelOne is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

SentinelOne participates in the E-Verify Program for all U.S. based roles.

🎯 Who is this job for?

This role is suitable for a Senior or Staff-level frontend engineer with strong experience building production applications in TypeScript and React, plus knowledge of GraphQL, REST, AI tools, and scalable data products. The candidate should be familiar with designing technical specifications, developing secure and high-quality features, conducting code reviews, improving performance and stability, and working with product and engineering teams. They should also demonstrate technical leadership, strong communication, mentoring and problem-solving skills, and the ability to collaborate effectively across distributed teams.

💬 Potential Interview Questions

How would you design a scalable React and TypeScript application for a security data platform handling large volumes of threat-hunting data?

I would use a modular feature-based architecture, strict TypeScript types, predictable state management, and virtualization for large result sets. I would also separate data-fetching concerns from presentation and establish performance monitoring early.

How do you use TypeScript to improve the reliability and maintainability of a large frontend codebase?

I use strict compiler settings, discriminated unions, generics, and domain-specific types to model API and UI states accurately. I also avoid unsafe escape hatches such as excessive any usage and keep shared types versioned and documented.

How would you optimize a React interface that displays millions of security events?

I would combine server-side filtering and pagination with list virtualization, memoized rendering, stable component keys, and carefully designed selectors. I would profile the application to identify actual bottlenecks rather than optimizing based on assumptions.

What are the main differences between GraphQL and REST, and how would you choose between them?

GraphQL lets clients request precisely the data they need and is useful for complex, interconnected views, while REST offers simpler resource-oriented APIs and caching semantics. I would choose based on domain complexity, backend support, caching requirements, and operational characteristics.

How would you handle loading, error, empty, and partial-data states in a data-intensive React application?

I would model these states explicitly and present clear, actionable feedback without losing already available data. Retry behavior, request cancellation, stale-data indicators, and consistent error boundaries would be part of the design.

How would you secure a frontend application used for threat hunting and security operations?

I would enforce authentication and authorization through the backend, avoid trusting client-side permissions, and protect tokens and sensitive data from unnecessary exposure. I would also apply secure dependency management, input validation, CSP, safe rendering practices, and audit-friendly error handling.

How do you approach frontend testing for a critical security product?

I use unit tests for domain logic, component tests for user interactions, contract tests for API integration, and end-to-end tests for critical workflows. Tests should cover permission boundaries, error states, large datasets, and regression-prone threat-hunting scenarios.

Describe how you would introduce a new frontend architecture or coding standard across multiple teams.

I would first establish the problem and success criteria, validate the approach with a small pilot, and document clear migration guidance. Adoption is reinforced through examples, tooling, code reviews, automated checks, and collaboration rather than mandates alone.

How would you use AI tools responsibly in your frontend engineering workflow?

I would use AI for exploration, test generation, refactoring suggestions, and documentation, while treating its output as untrusted code. All generated changes would be reviewed for correctness, security, privacy, performance, licensing, and consistency with project standards.

How do you resolve technical disagreements with product managers and remote engineering teams?

I make the trade-offs explicit using requirements, user impact, risk, cost, and measurable outcomes. I seek alignment through written proposals and small experiments, then document decisions so distributed teams share the same context.

📋 Job Summary

SentinelOne is an AI-native cybersecurity company protecting global enterprises, critical infrastructure, and emerging technologies. As a Staff Frontend Engineer, you’ll build and lead frontend development for Singularity Data-Lake products using TypeScript, React, GraphQL, and REST, while shaping technical standards and collaborating with product and distributed engineering teams. This role is remote across the Czech Republic and Slovakia, with hybrid options in Prague or Brno; salary is not disclosed. Apply to influence high-impact security products processing petabytes of data daily, with AI innovation, equity, bonuses, generous time off, and comprehensive wellbeing benefits.