Full-Stack Software Engineer

Company: Sage
Apply for the Full-Stack Software Engineer
Location: Winnersh
Job Description:

Job Description

As a Full-Stack Engineer on our new UK-based team, you will help us build a financial B2B SaaS platform using TypeScript, React, and Node.js. You’ll tackle our unique challenge: ensuring high performance on an application that handles complex financial calculations and large datasets.

With an 80/20 frontend‑to‑backend focus, this role is ideal for someone who takes initiative, is passionate about creating excellent software, and thrives in a multicultural environment. This is a fantastic opportunity to grow your skills while shaping up a new team and a cutting‑edge platform.

Hybrid role – three days per week in our Winnersh office

Key Responsibilities

  • Collaborate with product managers, designers, and other engineers to translate requirements into well‑architected, user‑friendly features.
  • Write clean, scalable, and high‑performance code for both the front end (React/TypeScript) and back end (Node.js).
  • Collaborate with field teams to support our customers, debug issues, and offer prompt solutions.
  • Participate in code reviews and contribute to the continuous improvement of our development processes.
  • Improve the performance, scalability, and security of the platform.
  • Develop and maintain comprehensive tests to ensure software quality and reliability.
  • Work closely with the design team to ensure the platform is user‑friendly and follows UI/UX best practices.
  • Contribute to our Node.js and AWS back‑end services as needed.
  • Stay up‑to‑date with the latest trends in web development and cloud‑based SaaS technologies.

Required Qualifications

  • 3+ years of professional experience in software development for scalable, web‑based applications.
  • Strong proficiency in modern front‑end frameworks (e.g., React, Vue, Svelte).
  • Experience in client‑side JavaScript performance optimization.
  • Experience with Node.js.
  • Experience with RESTful APIs and relational databases (e.g., MySQL).
  • Familiarity with CI/CD pipelines.
  • Bachelor’s degree in Computer Science, Software Engineering, or a related field from a university or a leading college.

Bonus Points

  • Experience in building large‑scale, maintainable applications, with proficiency in TypeScript/JavaScript.
  • Familiarity with AWS infrastructure.
  • Experience with data‑intensive applications or financial modeling.

Soft Skills

  • Strong problem‑solving abilities and passion to learn.
  • Excellent communication skills and the ability to work well in a team, in a multicultural environment.
  • High attention to detail and a commitment to delivering high‑quality work.

Seniority level: Mid‑Senior level

Employment type: Full‑time

Job function: Engineering and Information Technology

Industries: Software Development

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Posted: November 15th, 2025