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Home · Intertek · Principal Full-Stack Engineer (C# / React / AWS)

We are looking for a Principal Full-Stack Engineer (C# / React / AWS) to shape the future of our web, mobile, and API platforms. This is a senior technical leadership role responsible for setting development standards, driving innovation, and ensuring delivery of scalable, high-quality solutions across web, mobile, and API platforms. This role requires hands-on coding expertise, cross-team collaboration, and the ability to mentor and guide developers across multiple projects and technologies. 

Lead architecture & delivery

  • Set technical direction across front-end, back-end, mobile, and cloud.

  • Design scalable APIs and data solutions using MySQL, SQL Server, Redis, and OpenSearch.

  • Shape and evolve containerised and serverless workloads (Docker, AWS ECS, Lambda).

  • Ensure performance, reliability, security, and clean engineering practices.

Drive modern development

  • Guide teams using frameworks such as React, Next.js, Vue, C#, .NET, and modern CI/CD pipelines.

  • Support native and cross-platform mobile teams through stable, well-versioned APIs.

  • Integrate AI-assisted capabilities where useful (e.g., search relevance, summarisation, assistants).

Collaborate across the business

  • Work closely with product, UX, QA, mobile, DevOps, and analytics teams to deliver cohesive experiences.

  • Influence architecture, data models, API contracts, and system design decisions.

  • Ensure consistent instrumentation and analytics across platforms (GA4, GTM).

Mentor & grow the engineering team

  • Coach developers through code reviews, pairing, and knowledge-sharing.

  • Champion best practices in coding, testing, observability, and continuous improvement.

  • Foster a culture of innovation and responsible use of AI tooling.

Deliver with impact

  • Balance hands-on coding with technical leadership.

  • Provide visibility on progress, risks, and dependencies across systems.

  • Ensure high-quality releases with strong testing, monitoring, and performance outcomes.

 Essential experience:

  • Front-end: React.js, Next.js, Vue.js, Nuxt.js (or equivalent modern JS frameworks). 

  • Back-end: C#, .NET (Core/8), REST/JSON APIs, AWS Lambda / serverless deployments. 

  • Data & Storage: 

  • Relational databases: MySQL and SQL Server – schema design, indexing, query optimisation, migration strategies. 

  • Caching: Redis (or compatible) for session, configuration, and application data. 

  • Files/objects in S3 or equivalent. 

  • Search: 

  • OpenSearch/Elasticsearch – index design, analysers, relevance tuning, and query optimisation. 

  • DevOps/Cloud & Virtualisation: 

  • AWS (core services including Lambda, ECS, S3, API Gateway, RDS). 

  • Docker-based development and deployment workflows. 

  • Terraform and CI/CD pipelines, infrastructure-as-code. 

  • Demonstrated ability to innovate, simplify, and deliver impactful solutions at scale.

 Additional experience (beneficial, not essential)

  • Supporting or integrating with iOS and Android applications, including authentication flows, rate limiting, and feature toggling.

  • Instrumentation of web and mobile apps using GA4 and GTM:

  • Event and conversion tracking

  • Tagging strategies and dataLayer best practices

  • Using analytics to guide product decisions

  • Working with AI-powered features such as relevance tuning, classification, summarisation, or content generation.

  • Designing and iterating on prompts

  • Evaluating output quality and safety

  • Integrating AI services into APIs and workflows

  • Strong architectural and systems design skills.

  • Experience with Agile/Scrum environments.

Key competencies:

Technical Expertise – across modern frameworks, cloud-native architectures, serverless/container platforms, relational databases, search systems, and observability practices.

Leadership & Collaboration – strong ability to mentor engineers, elevate technical standards, and work effectively across product, UX, QA, DevOps, mobile, and analytics teams.

Innovation & Problem-Solving – proactively introduces new ideas, AI capabilities, tools, and processes; able to simplify complexity and drive meaningful improvements.

Delivery & Communication – excellent prioritisation, time management, and clear communication; able to deliver high-quality outcomes under pressure.

 We offer

  • Hybrid work environment 

  • Centrally Located Office in Sydney's CBD - Right Near Wynyard Station

  • Great Inclusive Team

  • Professional Company Culture

  • Opportunity to expand your experience and work with like-minded professionals.