Senior Platform & Backend Engineer — AWS, APIs & Data

Theia Insights; Cambridge; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

EMI share options

Private health insurance

Pension

25 days holiday + bank holidays

Hybrid work in UK (London orCambridge

Job summary

Theia Insights is seeking a mid-to-senior backend engineer in the UK to build scalable async REST endpoints using FastAPI and Python. You will manage large data pipelines with Pandas, Parquet/Arrow, and DuckDB, while owning identity and access via AWS IAM and OAuth2/OIDC.

Work closely with data teams to design new data access points, run services on AWS, and occasionally contribute to front-end features in TypeScript/React for end-to-end ownership and reliability.

Qualifications

• Production-level Python software with testing and observability.
• Experience delivering HTTP APIs in FastAPI or similar framework.
• Handling large tabular data with Pandas/Parquet/Arrow.

Responsibilities

• Build and operate async REST endpoints serving large datasets.
• Work with large tabular data using Pandas, Parquet/Arrow, and DuckDB.
• Own identity and access layer with AWS IAM, OAuth2/OIDC.

Skills

Python

FastAPI

Pandas

Parquet/Arrow

DuckDB

OAuth2/OIDC

REST APIs

TypeScript/React

AWS

RBAC

Tools

AWS CDK

Terraform

S3

CodePipeline

Job description

Theia Insights is seeking a mid-to-senior backend engineer in the UK to build scalable async REST endpoints using FastAPI and Python. You will manage large data pipelines with Pandas, Parquet/Arrow, and DuckDB, while owning identity and access via AWS IAM and OAuth2/OIDC.

Work closely with data teams to design new data access points, run services on AWS, and occasionally contribute to front-end features in TypeScript/React for end-to-end ownership and reliability.