April 8, 2026

Senior Full Stack TypeScript Engineer

Senior • Remote

30 - 40 USD

Gdansk, Poland

Senior Fullstack TypeScript Engineer – Fintech

London / Remote | B2B | Competitive package

Our client is a UK-based fintech company with 25+ years of experience delivering innovative solutions for repo and securities financing markets. Their platform connects major market participants and provides real-time services that enable efficient and accurate trading.

We are looking for a Senior Fullstack TypeScript Engineer to join our client’s engineering team. This role has a strong backend focus (approximately 60% backend / 40% frontend) and involves working across both frontend and backend systems, contributing to scalable architecture, feature delivery, and engineering best practices.

This is a hands-on, delivery-focused role with a strong emphasis on system design, quality, and modern engineering practices, including AI-assisted development workflows.

Responsibilities

  • Build and maintain Fullstack applications using TypeScript (Node.js + React)

  • Design and implement features across frontend and backend systems

  • Participate in API and system design discussions

  • Contribute to decisions around REST APIs, authentication, and architecture patterns

  • Build secure, scalable, and maintainable systems

  • Work with real-time and event-driven components where applicable

  • Write and maintain unit, integration, and end-to-end tests

  • Support production systems and assist in incident resolution when needed

  • Participate in code reviews and contribute to engineering standards

  • Use AI-assisted tools (e.g., Cursor, GitHub Copilot) to improve productivity, debugging, testing, and refactoring, while critically validating outputs


Requirements

  • Strong experience with Node.js, TypeScript, JavaScript (ES6+), React

  • Experience in building full-stack web applications

  • Solid understanding of REST APIs, authentication, and API design

  • Knowledge of scalable system design (stateless services, caching, queues, performance)

  • Experience with relational databases (PostgreSQL / MySQL)

  • Experience with testing (unit, integration, E2E)

  • Understanding of performance optimisation and debugging

  • Ability to evaluate technical trade-offs and system design decisions

  • Experience working in agile, collaborative teams

  • Strong communication and ownership mindset

  • English – professional working proficiency

AI & Engineering Mindset

  • Comfortable using AI tools in daily development work

  • Able to:

    • validate AI-generated code for security, maintainability, and performance

    • use AI for debugging, refactoring, and test generation

    • critically assess outputs instead of blindly accepting suggestions

  • Awareness of secure usage of AI tools and data handling practices

Nice to have

  • AWS / cloud experience

  • Docker / Terraform

  • Event-driven architecture

  • GraphQL experience

  • State management (Redux / Zustand)

  • Tailwind / Styled Components

  • Observability (logging, metrics)

  • Load / performance testing

  • Data visualization (D3.js)

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