Senior Software Engineer Job Livingston area,Scotland UK,Software Development

Applications Engineering, part of Core Weave’s Data Infrastructure organization, builds the software Core Weave 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 Type Script 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, Star Rocks, or Snowflake
Strong Python and Type Script, 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 Lang Graph, 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 Star Rocks, Snowflake, or Big Query