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.