Senior Full Stack Engineer

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About Us

Cosegic is one of the UK\’s leading compliance consultancies, now investing heavily in a technology‑led future. We are building an internal product and engineering organisation with full support from the board and C‑suite – a skunkworks‑style team inside a 22‑year‑old firm, focused on developing modern RegTech products that will define the next phase of the business.

The Role

We\’re hiring a Senior Full Stack Engineer to help design, build, and scale the next generation of Cosegic\’s compliance intelligence platform. This is a modern, cloud‑native platform with its core foundations already built, giving you the opportunity to shape its architecture and drive its technical evolution as we scale.

You’ll work across the full stack, developing secure, performant APIs, crafting intuitive UIs, and optimizing deployments for global scalability. In addition, you’ll play a key role in data modelling and building features that transform complex regulatory data into actionable insights.

This is a hands‑on engineering role with significant autonomy. You’ll collaborate closely with Product, Design, and Compliance teams to deliver user‑centred solutions that meet the demands of regulated industries. Beyond coding, you’ll influence architectural decisions, champion best practices, and mentor other engineers as we scale.

What You’ll Do

• Design and build scalable, multi‑tenant features using Next.js and TypeScript.
• Develop secure, performant APIs and server‑side logic leveraging Bun and Drizzle ORM on PostgreSQL (Neon).
• Model and optimise complex compliance datasets for performance and scalability.
• Implement robust authentication and authorisation flows with Better Auth, including multi‑tenancy and RBAC.
• Create accessible, responsive UIs using Radix UI, shadcn/ui, and Tailwind CSS.
• Integrate event‑driven workflows with Inngest and deliver transactional communications via Resend.
• Build data‑driven dashboards and visualisations using tools like Recharts.
• Optimise deployments and performance on Vercel, ensuring global scalability and reliability.
• Contribute to architectural decisions, code quality, and platform evolution.
• Mentor engineers and champion best practices in testing, security, and developer experience.

What We’re Looking For

• Strong experience (6‑10 years) in full‑stack development with React/Next.js and TypeScript.
• Deep understanding of modern web architecture, including serverless and edge deployments.
• Proficiency with relational databases (PostgreSQL) and ORMs (preferably Drizzle or similar).
• Experience with data modelling, performance optimisation, and building data‑driven features.
• Experience with authentication, authorisation, and multi‑tenant systems.
• Familiarity with event‑driven workflows and cloud‑native platforms (e.g., Inngest, Vercel, Neon).
• Ability to reason about scalability, security, and performance in distributed systems.
• Comfortable working cross‑functionally in a product‑led environment.
• Bonus: experience in compliance, fintech, or regulated industries and familiarity with Laravel, as there will be migration work from a legacy platform.

Why Join Us

• Work in a fully backed, high‑autonomy engineering team building a modern, cloud‑native platform.
• Shape the technology foundations of a company transitioning from consultancy to product‑led delivery.
• Use cutting‑edge tools and engineering practices to build impactful, user‑centred products.
• Competitive salary up to £90k, with hybrid, London‑based working.

Benefits and Perks

• 25 days annual leave
• Hybrid working from our London, Cannon Street office
• Ability to work from abroad (up to 21 working days per year)
• Private Medical Insurance and Health Cash Plan
• Unlimited one‑to‑one coaching with MoreHappi Coaching
• Employee Benefits Platform, including Cycle to Work Scheme and Sodexo Spree Card
• Tusker Electric Car Scheme
• Employee Assistance Programme (including counselling sessions)
• Pension Scheme
• Learning and development opportunities
• Volunteering, fundraising and fun company events

This is a full‑time, permanent role worked Monday to Friday on a hybrid basis. There’s flexibility to work fully remotely if preferred, with occasional office attendance when required by the business.

There is currently no deadline to apply, however, applications will be considered on a first come first serve basis and this opportunity will be closed once the right candidate has been found. We only accept applicant CVs from individuals who have the right to work in the UK.

Please note, we would like to thank all applicants for their interest in Cosegic. Due to the volume of applications received only those shortlisted will be contacted. If you have not received a response within 15 working days, please assume your application has not been successful.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Engineering and Information Technology

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