Software development remains the largest single category in the UK contractor market. Day rates vary significantly by language, framework, seniority, and whether the role is inside or outside IR35. Here is a snapshot of the current market.
Java contractors
Java remains one of the most demanded languages in enterprise contracting, particularly in financial services, insurance, and large-scale systems. Mid-level Java developers achieve £400–£500 per day. Senior developers with Spring Boot, microservices, and cloud deployment experience command £500–£650. Java architects can reach £650–£750+.
Python contractors
Python's versatility across web development, data engineering, machine learning, and automation keeps it in consistently high demand. General Python developers achieve £400–£550. Those combining Python with data engineering tools like Spark, Airflow, or Databricks reach £500–£650. Machine learning engineers using Python with TensorFlow or PyTorch command £550–£750.
JavaScript and TypeScript
Full-stack JavaScript contractors using React, Node.js, and TypeScript are in strong demand across start-ups, scale-ups, and enterprises. Mid-level rates sit at £400–£500. Senior full-stack developers with React and Node.js expertise achieve £500–£600. Those with additional skills in Next.js, GraphQL, or cloud deployment can reach £550–£650.
Go contractors
Go has carved out a niche in cloud-native development, infrastructure tooling, and high-performance services. The relatively small talent pool means experienced Go developers command premium rates of £550–£700, with senior roles reaching £650–£800 in fintech and platform engineering.
C# and .NET
The Microsoft ecosystem remains strong in enterprise environments. C# contractors with .NET Core and Azure experience achieve £400–£550. Senior developers and architects working on enterprise systems, APIs, and cloud migrations command £500–£650. Niche areas like Dynamics 365 development can also command premium rates.
Factors affecting your rate
Beyond language choice, several factors influence your achievable day rate: sector (financial services typically pays more), location (London premiums persist even for remote roles), IR35 status (outside IR35 commands 15-25 percent more than equivalent inside roles), security clearance, and the overall supply-demand balance for your specific combination of skills.