June 12, 2026
Software Engineer
Mid • Remote
47,300 - 64,500 EUR
Warsaw, Poland
THE CLIENT
Our client is a fast-growing cybersecurity product company rethinking how teams manage and share sensitive access. Their platform is trusted by 40,000+ organisations across 50+ countries - and growing fast. This is an engineering-led business: modern architecture, real technical challenges, and a strong focus on open source, privacy, and security. They’re building a fully remote, collaborative team and looking for engineers who take ownership and enjoy solving meaningful problems. If you want to work on a product with real impact at global scale - this is worth a conversation.
THE ROLE:
Our client is looking for a software engineer to join its Client team and help build the applications through which users experience the product, including browser extensions, desktop applications, command-line tools and SDKs.
This is not a typical frontend role. Because their product is built around end-to-end encryption and a zero-trust model, their client applications carry significant responsibility for security, data handling and product behaviour. The role sits at the intersection of client engineering, product thinking, usability and security-sensitive application design.
You would work on features used by a large open-source community, contributing across the full lifecycle: understanding the problem, shaping the approach, implementing the solution, testing it thoroughly and improving it over time. This role will suit someone who enjoys solving complex product problems, keeping solutions simple, and working in an environment where quality, openness and collaboration matter.
RESPONSIBILITIES:
Build and improve client applications across browser, desktop and adjacent client surfaces
Translate product and user needs into secure, usable client-side solutions
Implement and maintain business logic, local data handling and security-sensitive workflows on the client side
Contribute to testing strategy across unit, integration and end-to-end levels
Work closely with product, design and engineering peers to refine solutions before implementation
Help improve code quality, performance, maintainability and documentation
Contribute to open-source collaboration with the community where relevant
CORE REQUIREMENTS
3+ years of experience building JavaScript applications in production
Strong client-side engineering fundamentals with React or a similar framework
Ability to break down complex problems and design simple, robust solutions
Good testing habits and attention to quality
Comfort working across product, engineering and implementation questions - not just coding tickets
Strong collaboration skills, openness to feedback, and a low-ego working style
Interest in security, privacy, or building trustworthy software systems
NICE TO HAVE
Experience building browser extensions, desktop applications or other multi-platform clients
Experience with security-sensitive applications, client-side cryptography or zero-trust architectures
Experience with design systems, Storybook or usability-focused product development
Open-source contribution experience
Experience maintaining long-lived software products
Familiarity with other languages such as Go, Swift, C#, PHP, Python or Rust
Tools and technologies you’ll work with: JavaScript, React, HTML/CSS, Storybook, Jest, WebdriverIO, OpenPGP-related tooling, Git and Docker across Windows, macOS and Linux environments. (We do not expect candidates to bring experience with every tool listed here)
How you work
You take ownership of problems, not just tasks
You value simplicity and avoid over-engineering
You work well in an environment where feedback is frequent and constructive
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Cracow, Poland
6,500 - 7,000 USD
🏢 Summary: Senior Frontend Platform Engineer role focused on building and scaling a secure, micro-frontend-based SaaS UI platform used in highly regulated, enterprise environments. The position involves developing reusable components, CI/CD pipelines, and high-availability frontend systems integrated with REST/gRPC services. Engineers shape platform standards, performance, and secure-by-default practices at global scale. 🗂️ Requirements: 8+ years of professional software development experience, Strong proficiency in TypeScript, Strong proficiency in React, Experience building production-grade reusable frontend component libraries, Experience with frontend testing frameworks and test automation, Solid experience with Next.js, Solid experience with Node.js, Solid experience with Express, Experience delivering SaaS products, Experience integrating with RESTful or gRPC services 📃 Skills: TypeScript, React, Next.js, Node.js, Express, JavaScript, REST, gRPC, CI/CD, Azure, JSON, XML, Micro-frontend, Agile, TDD 🏢 Description: #4727 Our Client is building a SaaS platform used globally to streamline business-critical workflows and transform document-driven processes into intelligent, automated systems. Their platform powers agreement lifecycle experiences at a massive scale, serving millions of organizations across highly regulated and enterprise environments. The team develops a unified, widget-based frontend platform that standardizes how product teams deliver modern, high-performance user interfaces. This platform provides a shared shell, micro-frontend architecture, and automated CI/CD pipelines that distribute versioned UI components globally with high reliability. Part of the work includes supporting secure, compliance-heavy environments designed for federal-grade workloads. Engineers design systems that are secure by default, privacy-aware, and built on zero-trust principles. The role involves solving advanced platform challenges such as resilient rollouts, deterministic builds, telemetry without exposing sensitive data, and high-availability architecture in constrained environments. This is an opportunity to shape platform standards, performance practices, and developer tooling in a system operating at meaningful scale. Responsibilities : Design and implement reusable frontend components within a micro-frontend architecture. Build and maintain a shared UI platform that enables consistent user experiences across products. Develop scalable CI/CD pipelines that publish versioned frontend artifacts for global delivery. Contribute to secure-by-default engineering patterns aligned with compliance requirements. Optimize performance, observability, and reliability across distributed frontend systems. Collaborate with cross-functional teams to define platform standards and engineering best practices. Integrate frontend systems with RESTful and/or gRPC backend services. Support high-availability deployments in regulated or restricted environments. Required Qualifications : 8+ years of professional software development experience. Strong proficiency in TypeScript and React. Experience building reusable, production-grade frontend component libraries. Experience with frontend testing frameworks and test automation. Solid experience with Next.js , Node.js , and Express . Proven track record delivering SaaS products. Preferred Qualifications : Experience across the full software development lifecycle. Familiarity with schema modeling (e.g., JSON Schema or XML Schema). Experience with Agile and test-driven development methodologies. Experience with Azure DevOps or comparable CI/CD tooling. Knowledge of micro-frontend frameworks. Experience building or consuming RESTful or gRPC services. Strong written communication skills in asynchronous environments. Passion for platform engineering and high-quality software craftsmanship.