Middle+/Senior Frontend Engineer

Home Vacancies Middle+/Senior Frontend Engineer

*instinctools is a software development company that provides custom software solutions for businesses of all sizes. Our team works closely with clients to understand their specific needs and provide personalized solutions that meet their business requirements.

*instinctools is looking for a Middle+/Senior Frontend Engineer for one of our clients.

The project: It is a global mobility and urban services platform that allows users to book rides or other services and negotiate the fare directly with the service provider. It offers a variety of services including ride-hailing, intercity travel, delivery, and task assistance, operating in over 700 cities across 47 countries and is the second most downloaded mobility app in the world.

Tasks:

Lead user experience improvements in collaboration with design teams, translating complex workflows into intuitive and efficient interfaces;
Drive frontend architecture evolution, including framework migrations and the creation of reusable UI systems;
Enhancement and improvement of system resilience, performance, and stability;
Build and maintain user interfaces for managing complex operational and configuration workflows;
Design and implement modular, scalable, and maintainable frontend components and libraries;
Ensure high-quality performance, accessibility, and responsiveness across different browsers and devices;
Integrate frontend applications with backend services and handle data exchange securely and efficiently;
Apply best practices in frontend security to safeguard applications and user data;
Improve and support build, testing, and deployment processes for frontend applications;
Monitor and optimize frontend performance using metrics and analytical tools;
Collaborate closely with cross-functional teams to deliver cohesive, reliable, and end-to-end product features.

Our expectations of the ideal candidate:

Need-to-Have skills:

5 years of experience;
Deep knowledge of React (Hooks, Context, Suspense) and experience with state management tools (React Query, Zustand, Redux);
Strong TypeScript proficiency, including advanced typing patterns and generics;
Experience designing and maintaining large-scale frontend architectures, including modular or microfrontend patterns;
Proficiency with modern frontend tooling: Vite/Webpack, ESLint/Prettier, Jest, React Testing Library, Cypress;
Strong understanding of web performance optimization (code splitting, lazy loading, caching) and web security fundamentals (CSP, OAuth2, OIDC);
Awareness of accessibility standards (a11y) and solid understanding of UX best practices;
Practical experience with frontend CI/CD pipelines (GitLab CI, GitHub Actions, Jenkins);
Experience using Docker for local development and optimized builds;
Ability to ensure reliable delivery through proper testing (unit + integration), versioning, and deployment workflows.

Nice-to-have skills:

Basic understanding of how backend services work (requests, routing, business logic, databases);
Understanding of backend codebases (e.g., Node.js, Go, Python) for effective collaboration and debugging;
Familiarity with REST, GraphQL, or gRPC API design principles;
Understanding how authentication and authorization work (JWT, OAuth2, sessions);
Basic knowledge of SQL and ability to run simple queries for debugging or validation;
Understanding of caching concepts (Redis, in-memory caching, TTL);
Familiarity with message queues or pub/sub systems (Kafka, RabbitMQ, SQS) at a conceptual level;
Ability to assist with debugging integration issues between frontend and backend;
Understanding of common backend performance considerations (rate limits, pagination, batching);
Awareness of backend observability basics (logs, metrics, traces);
Intermediate English (written and spoken).

Soft Skills:

Strong self-management: ability to work independently and meet deadlines;
Proactive and ownership-driven mindset;
Effective and clear communication, including in distributed teams;
Collaborative, open to feedback, and focused on shared goals;
Strong problem-solving skills, especially in ambiguous contexts;
Adaptability to shifting priorities and new technologies.

We offer:

flexible working time
professional and ambitious team
learning opportunities, seminars and conferences and time for exploring new technologies
co-funding for language courses (English)

Important Notice Regarding Your Personal Data Security

At *instinctools, we take the security of your personal data very seriously. Please be informed that all official communication, offers, and correspondence from *instinctools are conducted only through our verified company resources, including:
Official Email Domain: @instinctools.com
Company Website: https://www.instinctools.com
Important Reminder:
*instinctools will NEVER ask for sensitive personal or financial information, including:
– Bank account details
– Credit/debit card numbers
– Passwords or PINs
If you receive any suspicious requests claiming to be from *instinctools via unofficial channels (e.g., personal emails, social media DMs, or phone calls), please:
– Do not respond or share any information.
– Report it immediately to compliance@instinctools.com or your official contact.
Your trust and security are our top priorities. For any questions, always verify through our official channels.

Thank you for your attention and cooperation.

Developers

*instinctools is a developer of IT solutions for Western Europe. We have over 350 projects in our portfolio. The spheres are different – from healthcare and medicine, training and education, to digital advertising, economics and IT. For the software implementation and maintenance across such a number of projects, competent developers are important.

We use a modern technology stack, the key of which are:

Javascript, ReactJS, Angular, Node.js, Golang, Python, Java, iOS, Android, Blockchain, AWS.

Join the *instinctools team!

*instinctools Poland
We have had a representative office in Poland (Warsaw) since 2021. Our Polish team consists of highly qualified and experienced specialists – most of them are Middle to Senior level Developers.
Right now we’re on the lookout for bright and innovative minds to join our professional team!

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