Senior Software Engineer - Fullstack

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.

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

As a Senior Software Engineer
-Fullstack you'll join a collaborative, multidisciplinary engineering team responsible for building the cloud platform and user-facing applications that power Trustonic's secure connected device ecosystem. Working alongside Product, UX, QA and fellow engineers, you'll contribute across the full technology stack, helping to create intuitive user experiences backed by secure, scalable cloud services.

In this role, you'll deliver end-to-end features that have a direct impact on customers, combining modern frontend development with robust backend engineering. Your work will help shape highly available, cloud-native solutions that are secure, performant and capable of supporting millions of devices worldwide, while contributing to a culture of innovation, technical excellence and continuous improvement.

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

As a Senior Software Engineer
-Fullstack
, you will:

• Design, build, debug, and deliver cloud-native features across the Trustonic platform 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 or participate in 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 growing environment
• Prepared to invest whatever effort is required to get the job done
• Operate with integrity and transparency and conduct business in a proper manner
• Tenacious with a problem-solving approach
• Organised, rigorous and autonomous

What makes you, you...

Skills

• React 18+ - functional components and hooks (use State,use Effect,use Context, custom hooks).
• Component-based UI architecture, JSX, and consuming REST/GraphQL APIs from the frontend.
• Jest and React Testing Library for unit and component-level testing.
• Cypress (or similar) for end-to-end frontend testing.
• Python 3.10+ - strong proficiency including type hints, data classes, and async patterns.
• AWS Lambda Powertools (Logger, Tracer, Metrics) for observability.
• FastAPI or 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…