MastarRec - Backend Engineer

Back-End Developer is needed in London, United States.

Client: MastarRec

Location: London, LND, gb

Contract: Freelance

Job Description

We’re hiring a talented and experienced Backend 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.

Requirements

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 microservices 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.