Senior Backend Engineer for AI-Driven FinTech Platform

Descrial; Greater London; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Competitive compensation

Opportunity to influence product for金融

Collaborative work environment

Exposure to AI/LLM integration

Job summary

Descrial is seeking a Back-End Engineer for the UK core team to build multi-tenant services, adapters, and the integration layer between Java/Spring and Python AI services. The work targets enterprise-grade systems with security, observability, and reliability built in from the start.

You will design REST and async services, scale systems for demanding enterprise users, and contribute to secure, observable, and cost-aware delivery on AWS.

Qualifications

• Multi-tenant or enterprise-grade system experience with isolation and auditability.
• 5+ years of backend engineering in production SaaS or platform environments.
• Strong Python (FastAPI) and SQL/PostgreSQL; ability to work across Java/Spring boundaries.

Responsibilities

• Design and ship REST and async services in Python 3.11+ / FastAPI and at the boundaries of the Java/Spring core, with PostgreSQL (async SQLAlchemy) persistence
• Implement multi-tenant patterns properly: isolation, tenant context, role-based access, and per-tenant configuration
• Own API contracts between core services and AI services; version and evolve them without breaking consumers
• Write comprehensive unit and integration tests (pytest / pytest-asyncio); hold the line on code review standards
• Build for observability: OpenTelemetry traces, structured logs, metrics, and actionable alerts — including token cost, model-call latency and failure rates for the AI services you sit alongside
• Build quality gates for probabilistic outputs: validation, schema enforcement and safe failure behaviour when an AI service returns something well-formed but wrong
• Handle security fundamentals as routine: authN/authZ, secrets, input validation, OWASP awareness, audit trails

Skills

Python (FastAPI) experience

Backend SaaS / Enterprise-grade

AWS

CI/CD tooling

SQL / PostgreSQL

Linux

Git

Education

Bachelor's degree in engineering/computer science or equivalent

Tools

PostgreSQL

AWS (EKS/ECS) tooling

Git

CI/CD pipelines

Job description

Descrial is seeking a Back-End Engineer for the UK core team to build multi-tenant services, adapters, and the integration layer between Java/Spring and Python AI services. The work targets enterprise-grade systems with security, observability, and reliability built in from the start.

You will design REST and async services, scale systems for demanding enterprise users, and contribute to secure, observable, and cost-aware delivery on AWS.