Senior Software Engineer - Backend

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.

Clickhere if you would like to find out more about Trustonic's culture code.

If you would like to work in a fast-moving global technology company, with great ambition, then we’d love to hear from you!

A bit about the team and what you'll deliver...

As a Senior Software Engineer - Backend
you'll join a collaborative, highly skilled engineering team responsible for developing and operating Trustonic's cloud platform, which underpins secure services used by millions of connected devices worldwide. Working closely with Product, QA, Dev Ops and fellow engineers, you'll help shape the technical direction of our backend services while contributing to a culture of continuous improvement, knowledge sharing and engineering excellence.

In this role, you'll deliver scalable, secure and resilient cloud-native solutions that enable the rapid development of new platform capabilities. Your work will directly influence the reliability, performance and scalability of our AWS-based services, helping to ensure our customers receive robust, high-quality solutions that meet the demands of a global, enterprise-scale platform.

Please note, this is a hybrid role with regular attendance required at our office in Winnersh.

As a Senior Software Engineer
-Backend
, you will:

• Design, build, debug, and deliver cloud-native features across the Trustonicplatform from early development through production release.
• Develop and enhance AWS-based microservices, with strong focus on AWS Lambda, SQS-driven workflows, API Gateway, and App Sync integrations.
• Build reliable backend services in Python 3 (FastAPI/Flask) and support event-driven processing patterns for high-scale device operations.
• Collaborate with QA and product engineering teams to improve release quality, performance, and resilience of ALPS services.
• Lead orparticipatein architecture discussions, design reviews, and code reviews across multiple backend services.
• Implement and promote SDLC best practices: requirements refinement, test strategy, CI/CD, observability, and production support.
• Diagnose and resolve production defects, performance bottlenecks, and integration issues across distributed systems.
• Support L3 operations, incident response, and post-incident improvements for business-critical AWS workloads.

Who you are...

• Team player
• Energetic and passionate about delivering great software in a rapidly growingenvironment
• Prepared to invest whatever effort isrequiredto get the jobdone
• Operatewithintegrity and transparency and conduct business in a propermanner
• Tenacious with a problem-solving approach
• Organised, rigorous andautonomous

What makes you, you...

Skills

• Python 3.10+ - strongproficiencyincluding type hints,data classes, and async patterns.
• AWS Lambda Powertools(Logger, Tracer, Metrics) for observability.
• FastAPIor Flask for containerised microservices.
• Hands-on AWS expertise:
  Lambda, SQS, SNS, Step Functions, App Sync (GraphQL), API Gateway, Cloud Watch, X-Ray, IAM, S3, and VPC fundamentals.
• PostgreSQL RDS - schema design, Alembic migrations, query optimisation.
• Redis - caching, pub/sub, distributed locks and idempotency patterns.
• Serverless Framework v3, Docker (container-based Lambdas),…