Principal Full-Stack Engineer (C# / React / Aws)

Intertek Inform; Sydney; Hybrid; AUD 180,000 - 240,000; Full time

Benefits offered by this job

Hybrid work environment

Office in Sydney CBD

Inclusive team culture

Professional company culture

Opportunity to expand experience

Job summary

Intertek Inform is seeking a Principal Full-Stack Engineer (C# / React / AWS) to lead and shape the future of our web, mobile, and API platforms from Sydney, NSW. The role blends hands-on coding with senior technical leadership, mentoring across teams and setting high standards for scalability, performance, and security.

You will collaborate with product, UX, QA, DevOps, and analytics to deliver cohesive experiences, influence architectures, and evolve data models while championing responsible

Qualifications

• Senior leadership setting development standards across web, mobile, and APIs.
• Hands-on coding with experience across frontend, backend, and cloud.
• Mentor and guide developers across multiple projects and technologies.
• Experience delivering scalable, high-quality solutions and CI/CD pipelines.

Responsibilities

• Set technical direction across front-end, back-end, mobile, and cloud.
• Design scalable APIs and data solutions.
• Shape containerised and serverless workloads (Docker, AWS ECS, Lambda).
• Ensure performance, reliability, security, and clean engineering practices.
• Collaborate with product, UX, QA, DevOps, and analytics teams.
• Mentor and grow the engineering team.
• Deliver with impact, with visibility on progress and risks.

Skills

Leadership

Mentoring

Cross-team collaboration

Hands-on coding

Delivery & communication

Problem solving

Tools

React

Next.js

Vue

C#

.NET

Docker

AWS

ECS

Lambda

OpenSearch

MySQL

SQL Server

Redis

Terraform

CI/CD

S3

API Gateway

Job description

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.

• 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.
• 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.
• 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.
• 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.
• 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.

Principal Full-Stack Engineer (C# / React / AWS) • Sydney, NSW, AU