Full Stack Engineer

MastarRec; Greater London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A technology company in Greater London is looking for a Backend / Full Stack Engineer. This role involves building and optimizing server-side logic and APIs, utilizing technologies such as Node.js, TypeScript, and React. The ideal candidate should have strong experience in API development and cloud technologies, with a focus on clean code and collaboration in an agile team environment. Competitive salary and benefits offered, including a remote-first policy and professional development support.

Benefits

Competitive salary and performance bonuses

Private health insurance

Remote-first policy

Learning & development allowance

Equity / stock options

Collaborative team culture

Qualifications

• Strong hands-on experience with Node.js and API development.
• Proficiency in JavaScript / TypeScript.
• Solid understanding of SQL / NoSQL databases.
• Experience with CI / CD pipelines and containerization.
• Familiarity with version control tools.

Responsibilities

• Design and maintain scalable server-side applications.
• Collaborate with frontend engineers to build integrations.
• Write clean, well-tested, and documented code.
• Implement CI / CD pipelines for code deployment.
• Optimize system performance and troubleshoot issues.
• Participate in architectural decisions.

Skills

Node.js

Express

JavaScript / TypeScript

SQL / NoSQL databases

API development

CI / CD pipelines

Docker

Git

Job description

Overview

We’re hiring a talented and experienced Backend / Full Stack Engineer to join an agile product development team working on modern web applications and scalable platforms. You’ll be responsible for building, maintaining, and optimising server-side logic and APIs, and contributing to full-stack solutions using JavaScript / TypeScript , Node.js , and React .

This is an opportunity to work in a fast-moving environment. Where innovation, reliability, and clean code are valued, supporting products within FinTech , Healthcare Technology , or SaaS ecosystems .

Job Responsibilities

• Design, build, and maintain scalable server-side applications and RESTful APIs using Node.js , Express , or similar frameworks.
• Collaborate with frontend engineers to build seamless integrations using React.js or similar JavaScript frameworks.
• Write clean, well-tested, and documented code that adheres to modern development best practices.
• Implement CI / CD pipelines and ensure reliable code deployment and integration.
• Work cross-functionally with Product Managers, Designers, and QA to ship high-quality features.
• Optimize system performance, troubleshoot production issues, and participate in code reviews.
• Contribute to architectural decisions and refactor legacy systems when required.

Required Skills

• Strong hands-on experience with Node.js , Express , and API development
• Proficiency in JavaScript / TypeScript
• Solid understanding of SQL / NoSQL databases (e.g., PostgreSQL, MongoDB)
• Experience with CI / CD pipelines and containerization (Docker)
• Experience building and consuming RESTful or GraphQL APIs
• Familiarity with version control tools (e.g., Git, GitHub)

Desired Skills

• Frontend development experience with React.js , Next.js , or similar
• Cloud deployment experience (AWS, Azure, GCP)
• Experience in micro services architecture
• Familiarity with Agile methodologies and TDD
• Prior experience in FinTech, Healthcare, or SaaS is a plus

Benefits

• Competitive salary and performance bonuses
• Private health insurance and wellness support
• Remote-first policy with flexible working hours
• Learning & development allowance
• Equity / stock options (depending on client)
• Modern tech stack, collaborative team culture

Additional Requirements

Requirements Required Skills Deep knowledge of digital payment ecosystems, architectures, and technologies Expertise in payment gateway integration, tokenisation, and fraud detection systems Strong understanding of ISO 20022, EMV, NFC, and 3D Secure protocols Familiarity with cloud-native architecture (AWS, GCP, or Azure) Ability to document and present technical concepts to stakeholders clearly Desired Skills Experience with real-time payment systems and blockchain-based solutions Hands-on coding experience with Java, Python, or Node.js TOGAF or AWS Solution Architect certification preferred Knowledge of financial data orchestration and embedded finance architectures