Senior Python Software Engineer (Data & Time-Series Focus)

Location: Leeds ,UK /Hybrid – 3 days at client office and 2 days remote

Experience: 9+ years (mandatory)

Client : Global information technology services and consulting company

Education: Degree in Software Engineering or related field

We are looking for a highly experienced Senior Python Software Engineer with strong expertise in data manipulation, time-series/data packages, and modern software engineering practices. The ideal candidate will be hands-on, detail-oriented, and comfortable working in data-driven environments.

• Design, develop, and maintain high-quality Python applications focused on data and time-series processing
• Perform data cleaning, preprocessing, transformation, and analysis using industry-standard libraries
• Write modular, reusable, and well-documented code following best practices
• Collaborate with cross-functional teams to gather requirements and deliver robust solutions
• Contribute to code reviews, testing strategies, and continuous improvement of development standards
• (Optional) Build and enhance interactive dashboards and visualisations using Plotly Dash

• 9+ years of hands-on software development experience
• Strong proficiency in Python programming
• Functions, classes, and object-oriented programming
• List comprehensions, generators, and error handling
• Working with virtual environments and package management (pip, venv)
• Solid experience with time-series and/or data-focused packages
• Excellent written and verbal communication skills

• Strong hands-on experience with:
• Pandas and NumPy (Polars is a plus)
• Proven skills in:
• Data cleaning and preprocessing
• Handling missing values
• Grouping, merging, pivoting, and aggregations
• Working with SQL for data access and analysis

• Version control using Git
• Writing clean, modular, and reusable code
• Unit testing (e.g., pytest)
• Code documentation and effective use of docstrings
• Use of linters and formatters to maintain code quality

• Experience with Plotly Dash
• Creating dashboards using callbacks, layouts, and components
• Customising visualisations using Plotly Graph Objects
• Experience consuming or exposing REST APIs
• Frontend integration using HTML and CSS within Dash applications

Note: Plotly Dash experience is a plus. Candidates strong in Python, data analysis, and software engineering fundamentals will be able to pick up Dash during the engagement.

• Opportunity to work on data-intensive, impactful projects
• Collaborative and engineering-driven environment
• Competitive compensation based on experience
• Flexible working options (role dependent)