Senior Software Engineer - Backend

Trustonic; Winnersh; On-site; GBP 90,000 - 120,000; Full time

Job summary

Trustonic is seeking a Senior Software Engineer - Backend to design and deliver scalable cloud-native features across its platform. You’ll focus on AWS-based microservices, primarily Python (FastAPI/Flask), leveraging Lambda, SQS, AppSync, API Gateway, and CloudWatch while driving observability and reliability.

You will collaborate with cross-functional teams to ensure robust production systems, participate in architecture discussions, and promote strong SDLC practices in a hybrid role with

Qualifications

• Degree in computer science, software engineering, or equivalent experience.
• Commercial experience building Python-based AWS Lambda services in production.
• Strong experience with PostgreSQL and DynamoDB.

Responsibilities

• Design, build, debug, and deliver cloud-native features across the Trustonic platform.
• Develop and enhance AWS-based microservices, with focus on Lambda, SQS, API Gateway, AppSync.
• Build reliable backend services in Python 3.x and support event-driven processing for high-scale device ops.
• Collaborate with QA and product teams to improve release quality, performance, and resilience.
• Lead or participate in architecture reviews and promote SDLC best practices.

Skills

Python 3.10+

AWS Lambda Powertools

FastAPI/Flask

AWS cloud services

PostgreSQL

Redis

Datadog APM

Logging & debugging

Linux & Git

Education

Bachelor's degree in Computer Science or equivalent

Tools

Docker

Terraform

Jenkins CI/CD

Airflow

PySpark/Glue

Serverless Framework

Kubernetes

Job description

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, DevOps 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 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 AppSync 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
• Good creative intelligence
• Tenacious with a problem-solving approach
• Organised, rigorous and autonomous

What makes you, you...

Skills

• SkillsPython 3.10+ - strong proficiency including type hints, dataclasses, 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, AppSync (GraphQL), API Gateway, CloudWatch, 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), Terraform, Jenkins CI/CD.
• Apache Airflow DAG authoring and AWS Glue with PySpark for batch ETL.
• pytest and moto (offline AWS service mocking), Black formatter, ruff linter.
• Datadog APM tracing and structured JSON logging with Lambda Powertools.
• Strong debugging skills across async event flows, API behaviour, and distributed systems.
• Good working knowledge of Linux, Git workflows, and infrastructure as code.

Experience and Knowledge

• Experience and KnowledgeA degree in computer science, software engineering, or equivalent experience
• Proven commercial experience building Python-based AWS Lambda services in production.
• Strong experience with PostgreSQL (schema design, Alembic migrations) and DynamoDB (access patterns, Streams).
• Experience with event-driven architectures: SQS, SNS, Step Functions, DLQ and retry patterns.
• Hands-on AWS infrastructure experience: Serverless Framework v3, Terraform, ECR, IAM.
• Experience deploying Docker container-based Lambda functions.
• Data engineering background with Airflow DAGs and PySpark/Glue ETL pipelines is an advantage.
• Multi-tenant SaaS platform experience at scale is desirable.
• Familiarity with telecom, OEM device management, or IoT platforms is a plus.
• Experience with CDC (Change Data Capture) and real-time data sync patterns is a plus.
• Experience reading or maintaining Java Spring Boot services is beneficial.
• AWS certification is highly desirable but not essential.