Senior Backend Engineer — Scale Go/Python Microservices

Extrac.ai; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Private Medical

Enhanced pension

33 days leave

Flexible work

Central London office

Job summary

ExTrac AI in London seeks a Senior Software Engineer to build and operate backend microservices using Go and Python. You will own end-to-end services, from API design to deployment, supporting multi-source data ingestion, search, indexing, and scalable pipelines while keeping latency and cost in check.

You will collaborate with analysts, product, ML, and frontend teams, improve observability, deployment pipelines, and infrastructure, and help shape architecture decisions.

Qualifications

• 4+ years of professional software engineering experience, with demonstrated ability to stand up production-grade services and experience owning features end to end.
• Proficiency in building microservices using Go or Python.
• Solid understanding of distributed systems, databases, and software engineering patterns.
• Experience with cloud infrastructure and infrastructure as code, and with the CI/CD pipelines around them.
• Strong communication and collaboration skills. Comfortable writing clear technical documentation and discussing requirements with colleagues from engineering and the wider team.
• Breadth across the stack: improving deployment pipelines, understanding database behaviour, and a genuine interest in security engineering.

Responsibilities

• Design APIs used by both internal teams and customers, and hold them to clear contracts and sensible versioning as the number of consumers grows.
• Develop Go and Python-based microservices to support data collection, processing, and querying.
• Hold services to production standards for latency, cost, and reliability, with instrumentation in place to know when they are not meeting them.
• Build and operate high-throughput data streaming pipelines and work on improving scalability, robustness, and latency.
• Optimise databases and index performance where it is the constraint on product behaviour.
• Work directly with analysts, product, and the ML team to translate live requests into system changes.

Skills

Go

Python

Distributed systems

Cloud infrastructure

CI/CD pipelines

Elasticsearch

PostgreSQL

Tools

Elasticsearch

PostgreSQL

Go tooling

Python tooling

Job description

ExTrac AI in London seeks a Senior Software Engineer to build and operate backend microservices using Go and Python. You will own end-to-end services, from API design to deployment, supporting multi-source data ingestion, search, indexing, and scalable pipelines while keeping latency and cost in check.

You will collaborate with analysts, product, ML, and frontend teams, improve observability, deployment pipelines, and infrastructure, and help shape architecture decisions.