Senior Full-Stack Engineer - Platform team in London

Taktile empowers financial institutions to transform into truly AI-native organizations. We’re growing rapidly with enterprise customers across banks and insurance companies, and we’re looking for a Senior Full-Stack Engineer to join our Platform team.

About The Role

Taktile helps financial institutions make smarter, safer decisions with the power of AI. Our Engineering and Product Design teams are building multiple verticals on our platform at high speed, leveraging AI and building agentic functionality into the platform itself. As we scale into the world’s largest regulated financial institutions, identity and access management (IAM), authorization, and fine‑grained permissions have become foundational to our enterprise readiness. We are hiring a Full-Stack Engineer to join the team building Taktile’s IAM and permissions platform: the authorization backbone that powers enterprise-grade access control across our product.

This is a genuinely full-stack role: you’ll design and build permission models and access controls end-to-end, from the React/TypeScript access‑management and admin UIs down to the Python (FastAPI) authorization services. You’ll take on the problems that make enterprise authorization genuinely hard: multi‑tenant isolation, fine‑grained permission checks in the hot path of millions of decisions a day, audit and access trails, and the constraints of regulated financial services. Backend development is a core requirement, and you’ll own features end‑to‑end (front‑end, backend, and operations over time). If you worked with Auth systems, Identity providers and complex authorization schemes we’d love to talk.

What You’ll Do

• Design, build, and operate core authorization primitives such as roles, policies, and fine‑grained permission checks (RBAC/ReBAC), along with the authentication and SSO/OAuth/OIDC flows that sit on top of them.
• Guarantee strict multi‑tenant isolation so every customer’s data and decisions stay fully segregated.
• Keep fine‑grained permission checks fast in the hot path of millions of automated decisions per day, where both latency and correctness are non‑negotiable.
• Build audit and access‑trail capabilities that give customers and auditors a verifiable record of who accessed what, when, and why.
• Design for regulated‑industry constraints (financial services, SOC 2 / ISO 27001, data residency), where access control is a compliance requirement, not just a feature.
• Leverage leading edge AI tools (e.g. Claude) on a daily basis to build industry‑shaping AI‑native capabilities.
• Work across the full stack to build our IAM, authorization, and permissions systems: front‑end in React/TypeScript and backend in Python (FastAPI), on an AWS serverless architecture.
• Build and maintain these security‑critical systems with care: review pull requests with depth and invest in strong test automation.
• Engage actively in team rituals such as daily syncs, planning sessions, demos, and technical deep‑dive discussions.
• Grow as an individual and accelerate your career by learning from our experienced team, contributing to a foundational layer of the product, and joining cross‑team learning groups.
• From day one you’ll contribute across both front‑end and backend, taking on backend work early and deepening your ownership of our IAM and permissions systems over time.

Tech stack

• Frontend: React, TypeScript
• Backend: Python (FastAPI)
• Cloud: AWS serverless
• Security: authN/authZ, SSO/OAuth/OIDC, fine‑grained permissions (RBAC/ReBAC)

Must have

• 5+ years of professional full‑stack experience, including strong proficiency with React and TypeScript.
• Experience building access control systems, with exposure to authentication and authorization concepts (RBAC, SSO, OAuth/OIDC, multi‑tenant permissions).
• Strong engineering fundamentals with a passion for simplicity and precision.
• Professional experience building backend services in Python (FastAPI or equivalent), including REST APIs and databases.
• Experience integrating into AWS or similar cloud providers.
• A genuine interest in security and access control, with exposure to authentication and authorization concepts (RBAC, SSO, OAuth/OIDC, multi‑tenant permissions).
• Fluency in English, both written and spoken, is essential as we operate in a remote environment requiring clear and effective communication.

Nice to have

• Deeper backend specialization (async patterns, performance tuning, data modeling).
• DynamoDB or Postgres, SQLAlchemy.
• Hands‑on experience designing authorization systems at scale: fine‑grained / ReBAC models, policy engines (OpenFGA or Zanzibar‑style systems, OPA), or multi‑tenant RBAC for enterprise SaaS.
• Prior ops or on‑call experience.

Our Offer

• Work with colleagues that lift you up, challenge you, celebrate you and help you grow.
• Experience a truly flat hierarchy and communicate directly with founding team members.
• Having an opinion and voicing your ideas is not only welcome but encouraged, especially when they challenge the status quo.
• Learn from experienced mentors and achieve tremendous personal and professional growth.
• Get to know and leverage our network of leading tech investors and advisors around the globe.
• Receive a top‑of‑market equity and cash compensation package.
• Get access to a self‑development budget you can use to e.g. attend conferences, buy books or take classes.
• Receive a new Apple MacBook Pro, as well as meaningful home office set‑up.

About Us

Taktile enables financial institutions to transform into AI‑native organizations that are increasingly powered by autonomous agents. With our modular Agentic Decision Platform, customers combine AI agents, rules, relevant context, and human oversight to safely automate and optimize their decisions—approving more customers, reimbursing claims instantly, stopping fraud before it spreads, and financing every business worth funding. Founded in 2020, Taktile powers millions of decisions daily for institutions including Mercury, Monzo, Faire, and Pleo.