Senior Product Engineer

About the role

Fin is seeking a product engineer to join our multidisciplinary teams to solve complex customer problems. You will build full-stack systems while collaborating with designers, researchers, and product managers to scale our AI Customer Agent platform. In this capacity, you will own the end-to-end delivery of features that directly influence the reliability and scalability of our production environment. Your work will ensure that the platform meets the demands of a global user base while maintaining high standards of performance and maintainability. You will be responsible for translating ambiguous product requirements into robust technical solutions that can withstand real-world traffic and edge cases. This role requires a proactive mindset to identify bottlenecks and implement improvements before they impact the customer experience. You will act as a technical leader, guiding the architecture decisions that shape how our AI Customer Agent interacts with backend systems.

Key facts

What you'll do

• Architect and develop technical plans to support a platform serving tens of millions of daily users.
• Write Ruby code to integrate AWS, infrastructure, and SaaS components.
• Deploy code to production on your first day and release features within your first week.
• Mentor junior engineers and participate in the candidate interview process.
• Utilize AI-powered developer tools to streamline workflows and reduce friction.
• Collaborate with designers and product managers to refine feature specifications before implementation.
• Analyze production metrics to identify trends and drive data-informed product decisions.
• Optimize application performance to ensure fast response times across all customer touchpoints.
• Implement automated testing strategies to increase confidence in releases and reduce manual QA overhead.
• Maintain and evolve existing codebases to improve readability, scalability, and long-term maintainability.
• Partner with security teams to ensure that all integrations comply with industry standards and best practices.
• Contribute to technical documentation that helps the broader engineering organization understand system behavior.
• Support on-call rotations to address production incidents and provide timely resolutions to critical issues.
• Explore new technologies and frameworks that could provide a competitive advantage in the market.

Requirements

• Minimum of 5 years of professional software engineering experience, ideally within a SaaS environment.
• Demonstrated ability to deliver significant impact on product outcomes and team performance.
• Proficiency in a high-level programming language such as Ruby, Python, or Javascript.
• Practical experience working with distributed systems.
• Proven track record of collaborating with cross-functional teams including designers and product managers.
• Strong understanding of software development lifecycle and agile methodologies.
• Experience with cloud infrastructure, particularly AWS services, is mandatory for this role.
• Ability to communicate technical concepts clearly to non-technical stakeholders.

Skills & tools

• Ruby
• AWS
• Distributed systems
• SaaS infrastructure

Practical notes

• Compensation includes a competitive salary and equity with regular performance-based reviews.
• Benefits include a pension scheme with up to 4% matching, comprehensive health and dental insurance for employees and dependents, and life assurance.
• Perks include daily catered lunches, a fully stocked kitchen, a flexible paid time off policy, and a Cycle-to-Work scheme with secure storage.
• Parental support includes paid maternity leave and 6 weeks of paternity leave.
• Standard hardware is a MacBook, with Windows options available for specific roles.
• The company maintains a neutral policy regarding social and political topics to focus on core business objectives and internal culture.
• The role requires a hybrid work arrangement with at least three days per week spent in the London office.
• Applicants must be eligible to work in the United Kingdom without sponsorship, as the company does not offer visa sponsorship for this position.
• The hiring process will include technical assessments and interviews designed to evaluate practical skills and cultural fit.
• Successful candidates are expected to start within a timeframe that aligns with business needs, and notice periods must be respected.
• This position is based in London, England, and candidates must be located in or willing to relocate to this region.