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Lead NextJS Full Stack Engineer

Job Overview

Location

UK

Job Type

Full-time

Category

Full-Stack Engineer

Date Posted

March 7, 2026

Full Job Description

đź“‹ Description

  • • As a Lead Next.js Full-Stack Engineer at Ruby Labs Ltd., you will be at the forefront of developing and scaling innovative consumer products within the LegalTech and Utilities sectors. This is a pivotal role for an experienced engineer who thrives in a dynamic, high-growth environment and possesses a strong blend of technical prowess, architectural vision, and leadership capabilities.
  • • You will take full ownership of critical product components, guiding them from initial concept through to successful deployment. This involves not only writing high-quality code but also deeply understanding the business objectives and translating them into robust, scalable technical solutions.
  • • Collaboration is key in this role. You will work closely with the Product team to architect solutions that are both maintainable and scalable, ensuring the platform can handle increasing user loads and feature complexity.
  • • A significant part of your responsibility will involve upholding and elevating engineering standards. This includes actively participating in, and often leading, code reviews, ensuring adherence to best practices, and promoting a culture of technical excellence across the team.
  • • As a lead engineer, you will play a crucial role in mentoring junior and mid-level developers. You will provide technical guidance, share your expertise, and foster an environment where team members can grow their skills and careers.
  • • You will also contribute to the growth of the engineering team by participating in hiring processes and onboarding new talent, helping to build a world-class engineering organization.
  • • In this fast-paced, high-traffic environment, maintaining exceptional code quality and application performance is paramount. You will be responsible for identifying and resolving performance bottlenecks, ensuring the platform remains responsive and reliable for hundreds of thousands of global customers.
  • • You will be instrumental in setting up and continuously improving our CI/CD pipelines and development workflows. This includes automating build, test, and deployment processes to enable rapid and reliable releases.
  • • Monitoring, debugging, and enhancing the stability and scalability of the system will be ongoing responsibilities. You will proactively identify potential issues and implement solutions to ensure the platform's resilience and ability to scale.
  • • This role offers a unique opportunity to shape the engineering culture as the team expands. Your leadership and vision will directly influence how the team operates, collaborates, and innovates.
  • • The product is a battle-tested, monetizing platform that is well beyond its MVP stage. You will be working on scaling real products with real users, processing significant traffic and revenue monthly. This is an opportunity to make a tangible impact on a successful and growing business.
  • • You will leverage your expertise in Next.js App Router to build modern, efficient, and performant full-stack applications. Your understanding of JavaScript/TypeScript and modern ReactJS will be essential in delivering cutting-edge features.
  • • Experience with A/B testing frameworks and utilizing analytics to inform product decisions will be crucial for driving continuous improvement and user engagement.
  • • Familiarity with Content Management Systems (CMS), particularly Payload, will be beneficial for integrating content management capabilities into the platform.
  • • You will be expected to make informed technical decisions, backing them up with logical reasoning and data-driven insights, and be comfortable defending these decisions within the team and to stakeholders.
  • • This role is ideal for someone who is proactive, takes ownership, and is excited by the challenge of building and scaling high-quality systems under real-world pressure, rather than maintaining a legacy system in a comfortable 9-5 setting.

Skills & Technologies

JavaScript
TypeScript
Go
Ruby
React
Full Stack
Senior
Remote

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About Ruby Labs Ltd.

Ruby Labs Ltd. is a London-based product studio that builds and scales consumer subscription mobile and web applications. The company focuses on health, wellness, and productivity verticals, developing apps such as Hint, Able, and the award-winning fitness platform FitCoach. Using data-driven growth and proprietary technology, Ruby Labs rapidly prototypes, launches, and iterates products to serve millions of global users. The team combines engineering, product design, and performance marketing expertise to create sustainable digital businesses. Founded in 2018, Ruby Labs operates a portfolio of self-funded apps, emphasizing user privacy, scientific validation, and long-term customer value.

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