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Senior/Principal Full-Stack Software Engineer

Senior/Principal Full-Stack Software Engineer

Hybrid

London, United kingdom

Senior

Full Time

02-12-2025

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Skills

Communication Leadership JavaScript TypeScript SQL NoSQL GraphQL Product vision Problem-solving Architecture Databases Azure react AWS cloud platforms JavaScript/TypeScript GCP

Job Specifications

About the role

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.

What you’ll be doing (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.

What you’ll need (Requirements and experience)

5+ years of professional experience as a JavaScript/TypeScript engineer (full-stack). Experience in a leadership role is a plus.
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)
Final Interview with CEO

Benefits

Competitive salary
33 days annual leave including bank holidays
Share options under the tax-friendly EMI scheme
Flexible working arrangements
Dog-friendly office right above the beautiful Eccleston Yards
Private healthcare (including dental and optic)
Outstanding career progression opportunities

About the Company

Clearly is a B2B SaaS company that helps fleet managers save time, costs and emissions by turning complex, messy data into simple, actionable strategies. Know more