Senior/Principal Full-Stack Software Engineer

Clearly, Greater London, England, United Kingdom

Overview

We are looking for a Senior/Principal Full-Stack Software Engineer to join our growing team at Clearly. This is a high-impact role where you will shape the technical foundation of our platform, influence product direction, and help us scale as a company. You’ll work closely with a cross-functional team and leadership, including the CEO, to ensure long-term strategy, product vision, and user experience all stay aligned.

Responsibilities

• Drive the design and delivery of technical solutions that solve real business problems and create value for our customers.
• Own key aspects of our system architecture, ensuring scalability, security, and performance.
• Collaborate with product, commercial, and leadership teams to balance user needs, technical constraints, and business priorities.
• Write high-quality, maintainable code across the stack, and contribute to code reviews, testing, and troubleshooting.
• Stay ahead of industry trends and bring best practice into the team.

Qualifications

• Proven experience working in an early-stage startup environment, ideally in B2B SaaS. You know how to thrive in ambiguity, move fast, and take ownership.
• Strong knowledge of modern frameworks and libraries, especially React on the front end.
• Experience building and maintaining APIs (REST/GraphQL), including documentation and SDKs.
• Solid understanding of databases (SQL and NoSQL) and server-side development.
• Experience deploying and managing applications on cloud platforms (AWS, Azure, or GCP).
• Ability to use the latest technologies to your advantage, while knowing when to keep things simple and avoid over-engineering.
• Strong communication and collaboration skills, with the ability to work across disciplines.
• A pragmatic, problem-solving mindset, comfortable making trade-offs to deliver value quickly without compromising long-term quality.

Application process

• 15-minute screening call with a member of the team
• Technical/architecture exercise (short take-home or live session, time-boxed to respect your time)
• 30-minute session with the tech team to discuss your approach
• Final interview with CEO
• 25 days annual leave + bank holidays
• Share options
• Flexible working arrangements
• Dog-friendly office above Eccleston Yards
• Private healthcare (including dental and optical)
• Outstanding career progression opportunities

Right to work

We are currently only accepting applications from candidates who have the right to work in the UK and will not require visa sponsorship (now or in the future).

We are an equal opportunity employer. All applicants will be considered for employment without attention to ethnicity, religion, sexual orientation, gender identity, family or parental status, national origin, veteran status or disability status.