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Community & Diversity Advocate | Global Tech Recruiter (350+ Hires) | Cross-Functional: Engineering • AI/ML • QE | BCS Committee Member | MoT...
Senior Product Engineer | Backend-Focused | FinTech SaaS
Location:
London | Hybrid (2 days a week in the City)
Eligibility:
Must have the right to work in the UK –
no sponsorship available
Hybrid Policy:
2–3 days in the London office (flexible for exceptional candidates within ± 3 hours GMT)
We’re looking for engineers with early‐stage startup experience or those who have thrived in high‐velocity environments.
You should be comfortable shipping features and products quickly and iterating fast.
If you’re excited by pace, ownership, and impact, this role is for you.
Who Thrives Here
Engineers who love autonomy, ownership, and speed
Builders who want to make technical and product decisions daily
People who prefer action and iteration over meetings and process
Not ideal for those who prefer large organisations, narrow scopes, or slower‐paced environments
Optimal are partnering with a high‐growth, venture‐backed startup that’s redefining how modern tech companies manage and automate their financial workflows.
Backed by top‐tier investors and growing rapidly, this team is scaling its engineering function to meet global demand.
They’re building next‐generation financial infrastructure trusted by fast‐scaling B2B companies and need top‐tier engineers to help shape the product, culture, and architecture.
About the Role
As a Senior Product Engineer with strong backend skills, you’ll play a pivotal role in:
Building robust financial tools for high‐growth technology companies
Shaping backend architecture and guiding product direction
Collaborating closely with design, product, and data teams to deliver world‐class features
Helping define the engineering culture and technical standards from an early stage
This is an opportunity to join a small, ambitious, and fast‐moving team tackling complex technical and financial challenges with creativity and precision.
What We’re Looking For
5 - 10 years of experience as a backend or full‐stack engineer delivering production software
Proven track record in B2B SaaS or FinTech environments
Experience in early‐stage or scale‐up startups - shipping fast without heavy process
Strong backend development skills in Python, TypeScript, Ruby, Java, or similar
Familiarity with Kotlin or a desire to learn it quickly
Experience with user‐facing products and a passion for understanding customer needs
Excellent collaboration skills and comfort working cross‐functionally in small teams
Bonus Points For
Degree in Computer Science or related field from a leading university
Experience in accounting, finance, or revenue operations tooling
Previous exposure to modern FinTech or workflow‐automation products
Why This Role is Exciting
Join a mission‐driven, venture‐backed FinTech scaleup solving real‐world financial challenges
Help shape architecture, product strategy, and engineering culture
Competitive salary, equity, and benefits
Hybrid work model - 2 days a week in a modern London office
Work with an exceptional team of ambitious builders who move fast and care deeply about quality
Please apply only if you tick all of the above boxes and want to work for a company who has growing rapidly!
Seniority level
Mid‐Senior level
Employment type
Full‐time
Job function
Engineering and Information Technology
Industries
Staffing and Recruiting
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