Senior Full-Stack Developer

GlaxoSmithKline; Poznań; On-site; PLN 90,000 - 120,000; Full time

Job summary

A leading global healthcare company is seeking a Senior Full Stack TypeScript Developer to deliver enterprise solutions in Poznań. Ideal candidates will have 6 to 8 years of relevant experience and strong skills in modern frameworks such as React and NextJS. Responsibilities include developing a custom-built web application and ensuring its operational excellence. This role also offers a comprehensive benefits package including life insurance and development opportunities.

Benefits

Attractive reward package

Life insurance and pension plan

Private medical package

Flexible working solutions

Qualifications

• 6 to 8 years relevant experience in full-stack development.
• Proficient in building and managing modern full-stack applications.
• Strong experience with test automation tools.

Responsibilities

• Deliver self-service capabilities across Microsoft Azure and Google Cloud.
• Maintain and optimize the web application hosted on Azure.
• Act as a hands-on contributor within a small development team.

Skills

HTML5

CSS3

TypeScript (ES6+)

React

NextJS

GraphQL

Webpack

Node (Express)

Jest

Playwright

Job description

Site Name: Poznan Pastelowa
Posted Date: Nov 18 2025

We’re looking for a Senior Full Stack TypeScript Developer, with 6 to 8 years relevant experience, capable of delivering enterprise solutions for internal use. Technically, you’ll be comfortable working using Agile methodologies in a Scrumban or SAFe environment, and have proven experience designing, building and managing modern full-stack applications using Cloud-native solutions.

You’ll be contributing to the development of the Hosting Portal, a product within GSK Enterprise Hosting Services, that allows application teams across GSK to provision and manage Cloud resources in a self‑service manner. The Hosting Portal is a custom‑built headless‑first web application using a modern TypeScript tech stack based on React, NextJS and Express.

Key Responsibilities

• Cloud Platform Enablement: Deliver self‑service capabilities across Microsoft Azure and Google Cloud, ensuring robust tooling and automation for developers.
• Application Hosting: Maintain and optimize the web application hosted on Azure, focusing on reliability and performance.
• Operational Ownership: Incident handling and ensuring operational SLAs.
• Individual Contribution: Act as a hands‑on contributor within a small development team, driving technical excellence and innovation.
• Collaboration & Oversight: Partner with professional services and contractors for targeted program work, ensuring quality and compliance with internal guidelines.

Why you?

Basic Qualifications:

• Excellent knowledge and hands on experience with HTML5, CSS3 (including preprocessors) and TypeScript (ES6+).
• Excellent knowledge and hands on experience with React and NextJS.
• Hands‑on experience with GraphQL and relevant tooling and libraries such as Yoga, Prisma, and Apollo Client.
• Good understanding of bundlers and compilers such as Webpack, TS-Node, Rspack and Babel.
• Previous experience in developing a React‑based UI Component library based on Mantine, Material UI, or Chakra UI.
• Familiar with popular patterns and libraries such as React Hooks, state management, and Redux.
• Previously developed schema‑based forms either custom or based on a library such as react‑hook‑form, including data validator libraries such as Yup, Zod or JOI.
• Expertise with CSS grid systems, media queries, flex and other layout techniques and responsive user interface components.
• Knowledge of modern authentication and authorization mechanisms such as OAuth v2 or SAML and JSON Web Token and libraries such as MSAL.
• Developed REST APIs based on Node (Express).
• Strong experience with test automation (unit & integration) tools such as Jest and Playwright.

Preferred Qualifications

• Experience of building and deploying web applications through CI/CD pipelines using GitHub Actions.
• Knowledge of deploying, managing and monitoring web applications in a Cloud environment such as Microsoft Azure or Google Cloud.
• Previous exposure to AI chatbot user interfaces, either custom or libraries such as Open WebUI, LibreChat or LobeChat.
• A fair understanding of MCP Server and its use cases.
• Previously worked in a central IT team within a regulated environment such as the Pharmaceutical or Finance industry.

Why GSK?

Our values and expectations are at the heart of everything we do and form an important part of our culture. These include Patient focus, Transparency, Respect, Integrity along with Courage, Accountability, Development, and Teamwork.

• Career at one of the leading global healthcare companies.
• Contract of employment.
• Attractive reward package (annual bonus & awards for outstanding performance, recognition awards for additional achievements and engagement, holiday benefit).
• Life insurance and pension plan.
• Private medical package with additional preventive healthcare services for employees and their eligible.
• Sports cards (Multisport).
• Possibilities of development within the role and company’s structure.
• Personalized learning approach (mentoring, online training’ platforms: Pluralsight, Business Skills, Harvard Manage Mentor, Skillsoft and external training).
• Extensive support of work life balance (flexible working solutions, short Fridays option, health & well-being activities).
• Supportive community and integration events.
• Modern office with creative rooms, fresh fruits everyday.
• Free car and bike parking, locker rooms and showers.

We want to hear from you and support with any adjustments that you may require during the recruitment process. Please get in touch with our Recruitment Team ([e-mail]) to further discuss this today.

#LI-GSK #LI-Hybrid

Why GSK?

Uniting science, technology and talent to get ahead of disease together.

GSK is a global biopharma company with a purpose to unite science, technology and talent to get ahead of disease together. We aim to positively impact the health of 2.5 billion people by the end of the decade, as a successful, growing company where people can thrive. We get ahead of disease by preventing and treating it with innovation in specialty medicines and vaccines. We focus on four therapeutic areas: respiratory, immunology and inflammation; oncology; HIV; and infectious diseases – to impact health at scale.

People and patients around the world count on the medicines and vaccines we make, so we’re committed to creating an environment where our people can thrive and focus on what matters most. Our culture of being ambitious for patients, accountable for impact and doing the right thing is the foundation for how, together, we deliver for patients, shareholders and our people.

GSK is an Equal Opportunity Employer. This ensures that all qualified applicants will receive equal consideration for employment without regard to race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), parental status, national origin, age, disability, genetic information (including family medical history), military service or any basis prohibited under federal, state or local law.

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