Senior Full stack Developer – Birmingham – Perm,

Location: Birmingham (Onsite)
Salary: £60,000 – £80,000 DOE
Job Type: Permanent, Full-Time

Senior Developer – Platform Stability, Performance & Engineering Excellence

We’re looking for an experienced Senior Developer who enjoys solving complex technical challenges and improving the quality, resilience, and performance of large-scale SaaS platforms.

This is a unique opportunity to play a key role in improving platform reliability, performance, and engineering standards across a growing technology business. Rather than focusing on traditional feature development alone, you’ll work closely with engineering teams to identify systemic issues, enhance platform robustness, and drive continuous improvement across the product.

If you enjoy deep technical investigation, performance optimisation, debugging complex issues, and improving software quality, this role could be an excellent fit.

What You’ll Be Doing

• Investigating and resolving complex production and platform issues.
• Identifying root causes of recurring technical problems and implementing long-term solutions.
• Improving platform reliability, resilience, and overall product quality.
• Performing application profiling, performance tuning, and optimisation.
• Enhancing observability, monitoring, alerting, and diagnostic capabilities.
• Working with engineering teams to improve development practices and technical standards.
• Reducing technical debt and identifying opportunities for platform improvement.
• Reviewing existing systems and codebases to improve maintainability and robustness.
• Supporting incident investigations and preventative engineering initiatives.
• Driving continuous improvement across product performance and operational stability.

Skills & Experience

Essential

• Strong commercial experience as a Software Developer, Senior Developer, Software Engineer, or similar role.
• Excellent debugging, troubleshooting, and analytical problem-solving skills.
• Experience working within complex production environments.
• Strong understanding of software architecture, performance bottlenecks, and system behaviour.
• Hands-on development experience with:
  • C#
  • JavaScript Angular
  • SQL
• Ability to investigate issues across multiple layers of a technology stack.
• Experience identifying and resolving root-cause issues rather than applying temporary fixes.
• Comfortable working independently and taking ownership of technical challenges.
• Strong communication skills and the ability to collaborate effectively across engineering teams.

Desirable

• Experience working on SaaS platforms or cloud-based applications.
• Exposure to observability and monitoring tools.
• Experience with performance profiling and optimisation techniques.
• Knowledge of scalability, resilience, and reliability engineering principles.
• Familiarity with CI/CD pipelines and modern software delivery practices.
• Experience mentoring developers and contributing to engineering best practices.

Who We’re Looking For

• Mid-to-Senior level developer with a passion for solving difficult technical problems.
• Naturally curious, analytical, and detail-oriented.
• Pragmatic and engineering-led in your approach.
• Focused on long-term improvements rather than quick fixes.
• Someone who enjoys making systems faster, more stable, and easier to maintain.
• Comfortable working across existing codebases and collaborating with multiple teams.

What’s On Offer

• Salary of £50,000 – £80,000 depending on experience.
• Opportunity to work on a complex SaaS platform with real technical challenges.
• High level of autonomy and ownership.
• Long-term career progression within a technology-focused organisation.
• The chance to influence engineering quality, platform performance, and product reliability.

Please note: This is a full-time onsite role based in Birmingham. Sponsorship is not available for this position.