Senior Software Engineer

CoreWeave; Livingston; On-site; GBP 70,000 - 100,000; Full time

Job summary

CoreWeave is hiring in Livingston, United Kingdom for an Applications Engineer who will build full-stack applications and features inside UNION, and own them in production from UI to data model.

You will work with TypeScript, React, Next.js, Python, and Kubernetes, shipping AI-powered interfaces and agents that operate on governed data. You will collaborate with non-engineers to define problems and deliver scalable software solutions.

Qualifications

• 5+ years building and operating production software, including backend services and modern web frontends.
• Experience collaborating with non-engineers to define problems and ship usable software.
• Strong SQL and relational data modeling, with live schema changes.
• Hands-on with containers and deployment tools such as Docker, Helm and Kubernetes.
• Experience wiring apps to data platforms and analytic databases like Spark, Kafka, Snowflake.
• Proficient in Python and TypeScript with React/Next.js or similar.
• Designing and running HTTP APIs with timeouts, retries, and correct writes.
• Shipping LLM-backed features to production with measurable quality.
• Experience with CI/CD, testing, observability and on-call responsibilities.
• Experience building AI-native apps and data-native interfaces in a cloud-native setup.

Responsibilities

• Build full-stack applications and features inside UNION and production, from interface to data model.
• Own the software in production and be the point of contact when things break.
• Collaborate with cross-functional teams including engineering, data, and operations to define what to build next.
• Ship AI-facing interfaces and agents that operate on governed data with measurable accuracy.
• Work out undocumented processes and define the right software to meet business needs.

Skills

Full-stack development

TypeScript

React

Next.js

Python

SQL

Kubernetes

Docker

LangGraph / AI frameworks

LLM-powered features

Tools

Docker

Helm

Kubernetes

PostgreSQL

Spark / Kafka / Snowflake

Job description

• Applications Engineering, part of CoreWeave’s Data Infrastructure organization, builds the software CoreWeave uses to plan and operate its own infrastructure business
• Some of that is UNION, our data platform, where anyone in the company can query the lakehouse in plain language and stand up their own dashboards, applications, and agents
• The rest is the applications behind decisions like which data centers get which hardware and when, for a company adding gigawatts of capacity a year
• Engineering, finance, supply chain, and data center operations all depend on what we ship
• You will build full-stack applications, and features in UNION itself, and own all of it in production, from the interface down to the data model
• Our stack is TypeScript with React and Next
• Js, Python services running on Kubernetes, and Postgres alongside the lakehouse
• We care more that you have built and run this kind of software than which frameworks you built it in
• A good share of the work is AI-facing, meaning natural language interfaces and agents that operate on governed data, plus the evaluation work that tells you whether they are any good
• Owning a product area here means you sit with the people who run the process and work out with them what the software should do
• You are also the one who answers for it when it breaks
• Most of these processes have never been written down anywhere, so a fair amount of the job is working out what to build before you build it

• 5+ years building and operating production software, including both backend services and modern web frontends
• Experience working directly with non-engineers on problems nobody had specified yet, and shipping software they adopted
• Strong SQL and relational data modeling, including schemas you had to change after they were already live
• Hands-on experience with containers and deployment tooling such as Docker, Helm, and Kubernetes, and with operating your own services
• Experience wiring applications up to data platforms and analytical databases such as Spark, Kafka, StarRocks, or Snowflake
• Strong Python and TypeScript, with real experience in React, Next.js, or a comparable modern framework
• Experience designing and running HTTP APIs that other services depend on, including timeouts, retries, and keeping writes correct when a call fails partway through
• Experience shipping LLM-backed features to production, including how you measured whether their output was correct
• CI/CD, automated testing, observability, and on-call for the software you own
• We believe in investing in our people, and value candidates who can bring their own diversified experiences to our teams – even if you aren’t a 100% skill or experience match
• Experience designing and running distributed systems in cloud-native environments such as Kubernetes
• Experience with agent frameworks such as LangGraph, and with the tracing and evaluation tooling around them
• Experience building internal platforms or tools that other teams used to answer their own questions
• Background in an operationally heavy domain such as capacity planning, supply chain, or finance
• Experience building AI-native applications such as text-to-SQL interfaces, copilots, agents, or automated insight generation
• Familiarity with open table formats such as Iceberg, Delta, or Hudi, and with query engines such as StarRocks, Snowflake, or BigQuery