Senior Developer

At Certn, we're revolutionizing background screening with The World's Easiest Background Check — fast, global, and powered by tech. We're not about outdated processes and red tape. We're about innovation, speed, and impact. If you're looking for a place where ownership, collaboration, and creativity thrive, this is it.

We're looking for a Senior Developer who thrives in ambiguity, builds with purpose, and thinks beyond code. In this role, you will be working in a fast-paced agile environment tackling meaningful challenges — from digital identity to fraud prevention and HR tech. The Senior Developer will be responsible for all aspects of software development as part of an Agile team. The position is accountable for participating in and guiding all technical activities within the team, including estimating, sprint planning, software development life cycle activities, code reviews, research, deployments, and documentation creation. You will provide technical leadership and mentorship to junior and intermediate team members, ensuring the delivery of high-quality software that aligns with customer needs and requirements, technical architecture, development standards, and quality practices.

• Lead end-to-end feature development in a modern SaaS environment

• Write, review, and mentor others in producing clean, scalable code (20% of your time will be dedicated to mentorship and code reviews)

• Partner in a triad with Product and Design to lead project delivery

• Plan, estimate, and deliver on timelines with a focus on business impact

• Champion observability, reliability, and high availability in production systems

• Support and unblock customers by resolving high-priority bugs

• Work asynchronously with globally distributed teams

• Contribute to technical strategy, architecture, and documentation

We believe talent knows no borders, and we're open to candidates from the UK and beyond.

• Strong proficiency in Python or similar tech stack; adaptable to other languages and stacks

• Solid experience with front-end frameworks like React or Angular

• Deep understanding of REST APIs and authentication/authorization

• Proficiency in relational databases (PostgreSQL, MySQL)

• Proven track record in Agile environments (Scrum/Kanban)

• Experience mentoring developers and leading teams or projects

• Ability to articulate the business impact of technical decisions

• Bonus: Experience with ambiguous or complex problem spaces

• Flexibility: Remote-first role Occasional travel (1–4 times/year) for client meetings and team events.

• Impact & Growth: Join a high-energy team solving real-world problems with cutting-edge tech.

• Full-Cycle Exposure: Drive every stage of development from idea to delivery.

• Global Collaboration: Work with world-class teams across North America, the UK, and beyond.

• Compensation: Competitive salary, comprehensive health benefits, generous paid time off.

• Culture: Data-driven, supportive, and non-micromanaged environment where you're encouraged to grow and lead.

Certn is a growing global technology company reinventing the way organizations build trust in people with technology and AI-backed background checks. Having recently been named one of Canada's Companies-to-Watch in Deloitte's Technology Fast 50 Awards, we are one of the fastest-growing start-ups in the sector. Just so you know, the selected candidate will be required to complete a background check — so you'll get to see first-hand what we do. Certn is committed to equal opportunity, inclusion, and diversity. If you have a disability that requires accommodation at any stage of the recruitment process, please let us know how we can best assist you.

Ready to make an impact and build your career at Certn?
Apply now to join our team.