SEARGIN IS HIRING!
As a dynamic multinational tech company operating in 50 countries, we drive innovation and create projects that shape the future and greatly enhance the quality of life. You will find our solutions in the space industry, supporting scientists in the development of cancer drugs, and implementing innovative technological solutions for industrial clients worldwide. These are just some of the areas in which we operate!
Currently, for the new Seargin project we are looking for a Principal Engineer.
Location: Remote
Employment Type: b2b contract
FTE: full-time
The company’s initiative to build a B2B e-commerce portal for its pharmacy channel. The portal will let pharmacies and pharmacy chains browse products, place and track orders, and manage their accounts with company. The consultant will join as a senior full-stack developer able to own features end to end, from data model and API through to the user interface.
Key Tasks and Responsibilities
- Design, build and maintain the B2B portal front end in React with TypeScript, using React Router 7 for routing and data loading.
- Build and maintain backend services in Fastify (Node.js / TypeScript), including REST and GraphQL APIs.
- Design and optimise the PostgreSQL data model for B2B commerce domains such as product catalogue, customer-specific pricing, orders, accounts and user roles.
- Implement caching, session handling and performance optimisation with Redis.
- Manage server state and data fetching on the front end with TanStack Query.
- Implement schema validation and type-safe contracts across front end and back end using Zod.
- Build typical B2B portal features: customer account hierarchies, role-based access, bulk and repeat ordering, order history and tracking, invoices and document access.
- Integrate the portal with company’s internal systems (e.g. ERP, product information, customer master data) via APIs.
- Work independently with business stakeholders to clarify requirements and translate them into technical solutions.
- Write clean, tested, documented code and take part in code reviews.
- Ensure the solution meets security, data privacy and compliance standards expected in a regulated pharma/consumer health environment.
What we’re looking for:
- Commercial experience as a full-stack or front-end-heavy developer.
- Strong, hands-on TypeScript across front end and back end.
- Advanced React experience, including React Router (ideally v7 / Remix-style data loading).
- Practical experience with TanStack Query (React Query).
- Experience with Zod or a comparable schema validation library.
- Backend development in Node.js with Fastify.
- GraphQL - designing schemas and building APIs.
- PostgreSQL - data modelling, query writing and performance tuning.
- Redis - caching and/or session management.
- Proven experience building B2B portals or B2B e-commerce platforms (ordering, pricing, account management).
- Experience working in or for pharmaceutical, healthcare or consumer health companies.
- Ability to work independently, take ownership of features and make sound technical decisions with minimal supervision.
- English at C1 level, spoken and written, for daily communication with international stakeholders.
Nice to have:
- Polish language (native or fluent).
- Experience with headless commerce platforms (e.g. commercetools, Shopify Plus B2B, SAP Commerce / Hybris, Salesforce B2B Commerce).
- Integration experience with SAP or other ERP systems.
- Knowledge of the pharmacy / pharma distribution channel and its specifics (wholesalers, pharmacy chains, regulated product handling).
- Familiarity with GxP or other pharma compliance and data privacy requirements (GDPR).
- Cloud experience (Azure or AWS), Docker and CI/CD pipelines.
- Automated testing experience (Vitest/Jest, Playwright or Cypress).
- Experience with monorepo tooling (Nx, Turborepo).
- Accessibility (WCAG) and front-end performance optimisation.
- Previous work with large FMCG/pharma clients.
Contact: karolina.olesik@seargin.com
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To learn more about Seargin, please visit our web page: www.seargin.com