Full stack Engineer - AI

Ebury helps ambitious businesses unlock global growth, and we take the same approach with our people. We encourage innovation and movement, collaboration and problem-solving, and foster an environment where everyone can feel they belong, are valued, supported and empowered to succeed.

If you’re a collaborator who wants to help transform how businesses operate globally, get in touch - we’d love to discuss how Ebury can accelerate your career so you can shape the future.

Senior Full-Stack Engineer — Flow (AI Agent Platform)

Location:

London Victoria Office Work Pattern:
Hybrid (4 days office, 1 day remote)
Team:
Flow (Core AI Infrastructure)
About the Role Flow is our internal AI agent platform. This isn't a basic chatbot bolted onto a help center; it is core agentic infrastructure that reaches across our data warehouse, services, and central systems to execute complex work on behalf of the business. Flow powers both internal and client-facing workflows, delivering true automation and replacing traditional ticketing queues with instant, intelligent actions.

We are looking for a Senior Full-Stack Engineer to help us transition Flow from a fast-moving internal product to durable, productionized platform infrastructure. You will own complex features end-to-end—including agent workflows, reasoning UIs, and cross-system integrations—while raising the engineering bar and shaping the technical direction of a small, autonomous team.

This role sits at the intersection of agentic AI and live operational workflows within a regulated fintech environment. The surface area is the entire company, and your impact will be visible within weeks.

What You'll DoBuild Action-Oriented Agent Workflows:
Design multi-step orchestration, tool use, and retrieval grounded in our data stores using the Strands Agents SDK.Architect End-to-End Features:
Own development across a React/Type Script frontend and Python/FastAPI backend, balancing rapid iteration with platform maintainability.

Own the Reasoning Layer:
Extend our Chain-of-Thought UI to ensure explainability. In a regulated environment, showing why an agent made a decision is a core feature, not a nicety.

Make Agents Measurably Reliable:
Build and extend our evaluation harness (Ragas) and observability platform (Langfuse, with session continuity) so we ship changes based on evidence, not vibes.

Define Evaluation Strategies:
Build custom evaluators, datasets, benchmarks, and automated regression suites to catch quality regressions before they hit production.

Integrate Systems & Clouds:
Connect internal APIs, data warehouses, email, and cross-cloud GCP/AWS services with robust error handling and distributed tracing.

Industrialize Prototypes:
Drive the discover industrialize product ionize lifecycle, turning promising AI prototypes into hardened, daily-deployed services on CD pipelines.

Mentor & Lead:
Uplift mid-level engineers through code reviews, pair programming, and establishing scalable engineering patterns.

Collaborate Cross-Functionally:
Partner with Product, Ops, Trading, and Treasury to identify high-value workflows worth automating (and ruthlessly deprioritize the ones that aren't).The Tech Stack Frontend React , Type Script Micro -frontend architecture

Chain-of-Thought / Agent-reasoning UIVite, Vitest Backend & AIPython, FastAPIStrands Agents SDK (Agent Orchestration)
AWS Bedrock RAG / Advanced Retrieval Ragas (Evaluation), Langfuse (LLM Observability)
InfrastructureAWS (ECS Fargate, Lambda, API Gateway, S3) with cross-cloud GCP integration

Terraform, Git Hub Actions Docker Event -driven integration patterns

What We're Looking For Must-Haves5+ years of professional software engineering experience.

Strong Python Backend Expertise:
Deep experience with FastAPI (or Django/Flask), asynchronous programming, clean architecture, and writing production-grade code.

Strong React & Type Script

Skills:

Ability to architect non-trivial frontends with sound state management, performance optimization, and comprehensive testing.

System Design Judgment: A proven track record of designing scalable, maintainable systems and clearly articulating architectural trade-offs.

API & Integration

Skills:

Proficiency…