Full Stack Engineer

MastarRec; City Of London; Remote; GBP 60,000 - 85,000; Full time

Job summary

A leading software development firm in the UK is seeking a talented Backend / Full Stack Engineer to join their agile team. You will be responsible for building and optimizing server-side APIs and contributing to full-stack solutions using JavaScript/TypeScript and React. Ideal candidates will have strong experience with Express, SQL/NoSQL databases, and CI/CD pipelines. This position offers competitive salary, private health insurance, and flexible remote work options.

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

Qualifications

• Strong hands-on experience with 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).
• Familiarity with version control tools.

Responsibilities

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

Skills

Express

JavaScript

TypeScript

SQL

NoSQL

RESTful APIs

GraphQL APIs

Docker

Git

React

Job description

Job Description

We are 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 will be responsible for building, maintaining, and optimising server-side logic and APIs and contributing to full-stack solutions using JavaScript / TypeScript 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 Express or similar frameworks.
• Collaborate with frontend engineers to build seamless integrations using React 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.

Requirements

• Strong hands‑on experience with 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).

Payment Ecosystem Requirements

• 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

• Frontend development experience with React 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.
• Experience with real‑time payment systems and blockchain‑based solutions.
• Hands‑on coding experience with Java, Python, or TOGAF or AWS Solution Architect certification preferred.
• Knowledge of financial data orchestration and embedded finance architectures.

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 and collaborative team culture.

Key Skills

Abinitio, Administration And Accounting, Android, Bid Management, Inventory Management, Embedded C

Employment Type: Full Time

Experience: years

Vacancy: 1

Yearly Salary: 60,000 - 85,000