Senior JavaScript Engineer (Poland, Contract)

Nearform

Location: Poland
Job Type: full-time
Salary: Unknown
Posted: August 11, 2025

Job Description

This is a full time opportunity on a 6m contract basis for those based in Poland.

The Opportunity

Nearform is a digital and AI engineering consultancy with a reputation for experience-led modernization. We focus on creating transformative digital products for enterprise customers across the UK and Ireland. Our approach blends deep technical expertise with modern, cloud-native solutions to help clients overcome legacy constraints and unlock new business value. We are on a growth journey, with ambitions to scale rapidly while broadening our service offering with AI solutions and Modern Managed Services.

We are looking for Senior Developers who can help our enterprise clients translate their requirements into functional and appealing interactive applications. The ideal candidate will be outcome driven, and have a drive to deliver the best quality output for our clients within specific timeframes.

The Role

At Nearform we modernise enterprises with open, creative software, evolving businesses for the modern world. Our teams of experts are helping our clients build cloud-native solutions using industry-leading design, technology and modern practices for software development.

As a Senior Engineer at Nearform your main task will be designing & building applications using JavaScript. However as you’ll likely work on a variety of projects your responsibilities may also include:

Supporting component design, development and maintenance and taking responsibility for personal technical quality standards within the project team.
Assisting with defining structured practices, especially in source code management, building and deployment.
Designing and implementing data storage solutions.
Optimising performance in applications for maximum speed and scalability.
Getting feedback from users and clients, and building solutions for them.
Assisting with the analysis of client requirements.
Working with and supporting Technical Leaders in project execution and timely delivery.
Collaborating with client teams.

Requirements

Excellent communication and collaboration skills.
Proficient in English
Significant experience delivering at a Senior Developer level, Node.js experience essential
Practical experience of delivering in an agile environment.
Practical experience and knowledge of developing real-world solutions.
Deep knowledge of the JavaScript language
Deep understanding of JavaScript frameworks, must include Node.js, React/js experience highly desirable
Deep understanding of versioning control tools - Git.
Testing experience and familiarity with testing tools at all levels, unit, integration and end to end testing.
Practical and real world experience working with databases.
Experience with automation, CI and CD.
Experience building software collaboratively using pull requests and code reviews

Back End/Full Stack

Deep understanding of SQL Databases for Back End of Full Stack roles (PostgreSQL is preferred).

Optional Experience

Typescript
Experience using GraphQL in a production environment
Good understanding of security and performance considerations.
Understanding of architectural and design patterns.
General familiarity with a wide variety of open-source technologies and tools.
Excellent analytical and multitasking skills.

Please get in touch to discuss remuneration.

Recruitment/Application process

A TalentCall with someone from the Talent team (30 mins approx.) to introduce to you Nearform and the role, and to make sure your experience is relevant for the position and to discuss life as a Nearformer
An assessment with a member of the hiring team (1 hr approx.), this session is carried out using a screen share. You will be given a challenge and asked to provide a working solution to a specified problem.
A video call with one of our Hiring Managers (45 mins approx.) which allows us to gain a better insight into what interests you, your technical background, and give you an overview of the work we do at Nearform.

Although we are widely dispersed, Nearformers are a tightly-knit team. We trust one another and care about our colleagues. We all get together in person at our annual company retreat, of course when we’re not faced with a global pandemic! Building on our open-source origins, we promote the sharing of thoughts, knowledge and ideas.

Nearform is committed to shaping a better world in all that we do. Our global team is built based on respect, inclusivity, diversity and excellence.

🎯 Who is this job for?

This role is ideal for a Senior JavaScript Engineer in Poland with strong experience in Node.js, React, and modern software development practices. You should be skilled in building scalable applications, database integration (PostgreSQL preferred), agile delivery, and CI/CD workflows. Suitable for someone comfortable collaborating with enterprise clients, optimizing performance, and working across both front-end and back-end solutions.

💬 Potential Interview Questions

What are the main differences between var, let, and const in JavaScript?
var has function scope and can be redeclared; let and const have block scope. const variables cannot be reassigned, while let variables can.
How would you handle asynchronous operations in Node.js?
Common approaches include using callbacks, Promises, and async/await. async/await improves readability and error handling with try/catch.
Explain how you would optimize a React application’s performance.
Techniques include memoizing components with React.memo, using useCallback/useMemo, code-splitting, lazy loading, and avoiding unnecessary re-renders.
What is the difference between SQL and NoSQL databases, and when would you use PostgreSQL?
SQL databases are relational with structured schemas; NoSQL databases are non-relational and flexible. PostgreSQL is preferred for complex queries, ACID compliance, and strong relational modeling.
How do you implement secure authentication in a Node.js application?
Use secure password hashing (e.g., bcrypt), store tokens securely, apply HTTPS, and implement JWT or session-based authentication with proper expiration.
Describe the CI/CD process and its benefits.
CI/CD automates integration, testing, and deployment. It improves code quality, speeds up delivery, and reduces deployment risks through early detection of issues.
How do you structure a Node.js project for scalability?
Use a modular folder structure, separate concerns (controllers, services, routes), implement environment-based configuration, and follow coding standards.
Explain the role of GraphQL compared to REST.
GraphQL allows clients to request exactly the data they need in a single query, reducing over-fetching. REST uses predefined endpoints and often returns fixed structures.
What are some common security vulnerabilities in JavaScript applications and how do you prevent them?
Examples include XSS, CSRF, and SQL injection. Prevention involves input validation, escaping output, using prepared statements, and applying security headers.
How do you test a Node.js application?
Use testing frameworks like Jest or Mocha for unit tests, Supertest for integration tests, and Cypress or Playwright for end-to-end testing.

📋 Job Summary

Nearform, a leading digital and AI engineering consultancy, is seeking a Senior JavaScript Engineer (Node.js, React) for a 6-month full-time contract in Poland. You’ll design and build high-quality, scalable applications, modernizing enterprise systems with cloud-native solutions. Our tech stack includes Node.js, React, PostgreSQL, Git, CI/CD, and agile practices, with opportunities to work with TypeScript and GraphQL. This is a fully remote role with a collaborative, inclusive culture and the chance to work on impactful projects for top enterprise clients. Join us to push technical boundaries, grow your skills, and shape the future of digital transformation.