Senior Backend Developer in Winnersh

At Trustonic, we make smartphones affordable for the many, enabling global access to devices and digital finance through the world’s most secure smartphone locking technology. We partner with mobile carriers, retailers, and financiers across 30+ countries, powering device financing solutions that drive economic inclusion, profitability, and growth.

We pride ourselves on living by the Trustonic culture code, a blueprint for our journey that recognises that great working environments don’t guarantee success, but bad ones almost always ensure failure. Working here, you’ll find a company that celebrates its diversity and is looking to do the right thing: for each other, the community and the planet. We believe in equal opportunities and take to heart the old African proverb ’If you only want to go fast, go alone. If you want to go far, go together’. We work flexibly when and where we’re at our best, but regardless of how you choose to work, we’ll make sure you feel like one of the team.

This is a remote role with attendance required at our office in Winnersh from time to time.

What you’ll do…

• Build Scalable Cloud Services: Design and develop Python-based backend services, from early concept through to production, using modern AWS serverless technologies.
• Deliver Event-Driven Architectures: Create and evolve event-driven systems using AWS Lambda, SQS, SNS, and Step Functions to support high-scale device operations.
• Own Backend Quality & Performance: Write clean, testable code and continuously improve system reliability, observability, and performance in production environments.
• Shape System Architecture: Contribute to architecture decisions, design reviews, and technical strategy across multiple backend services.
• Drive Engineering Best Practices: Promote strong SDLC practices including CI/CD, automated testing, monitoring, and structured logging.
• Collaborate Across Teams: Work closely with product, QA, and other engineers to deliver high-quality features and improve overall platform resilience.
• Solve Complex Problems: Diagnose and resolve issues across distributed systems, including performance bottlenecks and production incidents.
• Support Critical Systems: Participate in incident response and continuous improvement of business-critical AWS workloads.

What we’re looking for…

• Strong commercial experience building Python backend systems in production.
• Proven experience working with AWS serverless technologies (Lambda, API Gateway, SQS, SNS).
• Solid understanding of event-driven and distributed architectures.
• Experience with PostgreSQL (schema design, optimisation) and/or DynamoDB.
• Hands-on experience with Docker, Terraform, and CI/CD pipelines.
• Strong Python skills (modern features such as async, typing, and testing practices).
• Experience building APIs using frameworks like FastAPI or Flask.
• Understanding of observability, logging, and monitoring in cloud environments.
• Comfortable debugging complex, distributed systems.
• Nice to have: Experience with Airflow, PySpark, or data pipelines; Exposure to telecoms, IoT, or device management platforms; Familiarity with multi-tenant SaaS architectures; AWS certifications.

Ways of Working

• Thrive in a fast-paced, evolving engineering environment.
• Strong problem-solving mindset with attention to detail.
• Collaborative, pragmatic, and delivery-focused.
• Comfortable taking ownership and driving work independently.
• Curious and continuously looking to improve systems and practices.

Qualifications

• A degree in computer science, software engineering, or equivalent experience.
• AWS certification is highly desirable but not essential.

What we can provide you in return for your investment…

• Competitive compensation: A base salary that reflects your expertise and impact.
• Bonus scheme to share in our success.
• Financial security & wellbeing: Immediate participation in our pension scheme; Private medical insurance for you and your family from day one; Income protection and life insurance for peace of mind.
• Flexibility & work-life balance: Remote/hybrid working arrangements to support your lifestyle; An open holiday policy with no upper limit—take the time you need, when you need it; Support for volunteering and causes that matter to you.
• Growth & development: Opportunities for professional development and career progression; Exposure and interaction with global teams.
• Inclusive, supportive culture: A commitment to diversity, equity, and inclusion; A collaborative environment where your voice is valued and your wellbeing is prioritised.
• Impact & purpose: The chance to work on technology that drives global economic inclusion and makes a real difference in people’s lives.

Trustonic is an equal opportunity employer. We do not discriminate on any grounds. We empower, engage, enable and value differences between people, including; different races, ethnicities, genders, ages, religions, disabilities and sexual orientations, with differences in education, backgrounds, skill sets, experiences and knowledge.