Software Engineer: Platform and Backend (Mid-career / Senior)

Theia Insights; Barcelona; Híbrido; EUR 65.000 - 95.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive salary + share options

25 working days holiday + Spanish hols

Hybrid working from Barcelona

Descripción de la vacante

Theia Insights is seeking a Platform engineer in Barcelona to productise our data and power customer access. You will own analytical services, APIs and MCP connectors that let clients query our data through familiar tools and build first‑party applications powered by our platform.

You’ll own end-to-end reliability and performance, run services on AWS, and contribute to both backend and occasional frontend work in a polyglot environment.

Formación

• Strong production Python experience shipping and operating services.
• HTTP APIs in a typed framework (e.g., FastAPI) with clear schemas.
• Production AWS: S3, a compute service (ECS/Fargate or Lambda) and a datastore with least-privilege IAM.
• Auth in production: OAuth2/OIDC, JWT validation, API keys, scopes.
• Tabular data at scale: pandas, Parquet/Arrow, DuckDB (preferred).
• Multi-tenant SaaS concepts: RBAC, API-key management.

Responsabilidades

• Build and operate async REST endpoints (FastAPI) serving large datasets.
• Work with large tabular data (pandas, Parquet/Arrow, DuckDB) and optimize memory/perf.
• Own identity and access layer using AWS identities and data distribution.
• Design and build new data access points via APIs, analytics services, and MCP connectors.
• Run services on AWS and deploy via CDK/CodePipeline.
• Productionise code from data and quantitative teams.
• Occasionally contribute frontend changes in Theia Insights' TS/React apps.
• Ensure reliability and performance with graceful failure handling.

Conocimientos

Production Python

FastAPI

AWS (S3, compute, IAM)

API design and contracts

Data tooling (pandas, Parquet/Arrow)

RBAC / multi-tenant SaaS

CDK / Terraform (IaC)

TypeScript / React (frontend)

Descripción del empleo

About The Role

Theia Insights builds foundational financial intelligence products, including industry classification, knowledge graphs and factor risk models, for institutional investors. We serve some of the largest asset managers, hedge funds, index providers and sell-side banks.

About The Role

Theia Insights builds foundational financial intelligence products, including industry classification, knowledge graphs and factor risk models, for institutional investors. We serve some of the largest asset managers, hedge funds, index providers and sell-side banks.

As an engineer on the Platform team you'll productise our data and build the ways customers access and work with it. You'll own the analytical services, APIs and MCP connectors that let customers query our data directly from the tools they already use, and build first-party applications powered by our data.

What You'll Do

• Build and operate async REST endpoints (FastAPI, Pydantic) that serve large datasets reliably and quickly
• Work with large tabular data in pandas, Parquet/Arrow and DuckDB, and manage the memory and performance trade-offs of moving big datasets efficiently
• Own the identity and access layer, including AWS technologies for identity, authorisation and data distribution, supporting access to data through multiple channels
• Design and build new access points for our data, such as APIs, analytical services and MCP connectors
• Run services on AWS, with infrastructure in AWS CDK shipped via CodePipeline
• Productionise code from the data and quantitative teams
• Occasionally contribute changes to Theia Insights' TypeScript/React frontends that consume our API, particularly where a feature is simplest to own end to end
• Take end-to-end ownership of reliability and performance, including graceful handling of failure modes

Requirements

Essential

• Strong production Python including experience shipping and operating services
• HTTP APIs in a typed framework such as FastAPI, with schema and contract discipline
• Production AWS: S3, a compute service (e.g. ECS/Fargate or Lambda) and a datastore, with least-privilege IAM

Useful

• Auth in production: OAuth2/OIDC, JWT validation, API keys, scopes
• Tabular data at scale: pandas plus Parquet/Arrow, ideally DuckDB
• Multi-tenant SaaS: RBAC, API-key management

Nice to have

• Infrastructure as code (CDK in TypeScript, or Terraform)
• React/TypeScript, or comfort in a polyglot repo
• LLM or MCP integration and AI-facing tooling
• Financial-data or regulated-environment background

Experience We're Looking For

We care more about what you've owned than years on a CV. A strong mid-level engineer who has shipped and operated production AWS services, owning one end to end with tests, will meet the bar. Senior candidates will likely have designed large scale systems, owned responsibilities for auth or multi-tenant access, made cross-region and disaster-recovery trade-offs, and set the standard for a team.

Benefits

• Competitive salary plus share options
• 25 working days holiday, plus Spanish public holidays
• Hybrid working from Barcelona