Software Developer – Backend API Services

About the role

While primarily remote, this role requires occasional visits to the Bristol office or London. The Engineer is responsible for designing and developing API and database backend services. The successful candidate enjoys solving complex problems with pragmatic solutions, likes reverse engineering as much as implementing new functionality, and has a strong grasp of managing risk when making changes.

Key responsibilities

• Design, build, and maintain backend services for our cloud‑hosted PBX platform.
• Contribute to architecture decisions considering functionality, scalability, reliability, maintainability, and observability.
• Use data‑led analysis to drive improvements in system performance (profiling, optimization, capacity thinking).
• Debug and resolve complex issues in production and pre‑production environments.
• Collaborate with QA to define functional and performance test strategies and scenarios.
• Write clean, maintainable, unit‑tested code and raise engineering standards through reviews and mentoring.

Required profile

• 2+ years of professional software development experience (backend‑focused).
• Proven ability to read, understand, and safely modify existing codebases, including legacy systems.
• Experience designing or evolving high‑load/networked systems (throughput, latency, availability).
• Experience with CI/CD practices and extensive use of test automation.
• Comfortable debugging concurrency issues (threads, synchronization) or async execution patterns.
• Excellent communication and stakeholder‑management abilities.

Required skills

• Python
• Linux
• Nginx
• Tomcat
• HTTP/HTTPS and API development
• SQL and relational databases
• CI/CD
• Test automation
• Concurrency debugging