Top Software Engineer Jobs in Sydney

Develop and maintain enterprise-grade C# and .NET applications, RESTful APIs, event-driven microservices, and distributed systems on AWS. Design PostgreSQL schemas, optimize queries, and support high-volume workloads across the full software development lifecycle. Collaborate with product owners and architects while meeting compliance, security, resiliency, and service-level requirements. Use and evaluate AI-assisted development tools responsibly for coding, testing, refactoring, documentation, and automation.

Design and build reliable backend systems for the Yield investment product. Own end-to-end delivery of investment workflows, maintain financial infrastructure (reconciliation, ledgers), integrate with external providers, ensure observability and API quality, and collaborate with Product, Infrastructure, and Design.

Build end-to-end full stack trading applications for options: modern React frontends, distributed backend services (C++/Python), real-time data pipelines, trading and risk visualization, and tooling used directly by traders and researchers.

As an FDSE Intern, you'll collaborate with teams to address complex data challenges, develop software solutions, and engage directly with customers to drive impactful results.

As a Software Engineer Intern, you'll create tools for trading strategies, develop research platforms, and collaborate in small teams.

Design, develop, test, and deploy full-stack web applications and APIs to support investment management, portfolio operations, reporting, and business workflows. Build backend services, optimise SQL and database performance, integrate systems via APIs, contribute to cloud modernization, participate in architecture and code reviews, and improve application performance, security, and maintainability while collaborating with product and investment teams.

Looking for a Software Engineer to build scalable backend and APIs, collaborate on modernisation tools, and contribute to code analysis. Requires strong skills in Python/Java and relational data modelling.

The Senior Options Software Engineer will design, develop, and support a high-performance trading platform, collaborating with business leaders to create innovative software solutions and handle complex systems support for trading activities.

Build and maintain shared Go libraries and platform capabilities for data access, messaging, service communication, observability, and resilience. Design adoptable APIs, multi-cloud abstractions, and resilience primitives. Own security posture, operate libraries (on-call), consult engineering teams, participate in architectural governance, and collaborate with Data Services, Infrastructure, SRE, and Observability teams.

Build full-stack, low-latency trading and pricing tools for options traders. Collaborate with traders, researchers, and business stakeholders to design intuitive frontends and scalable backend services, prototype and productionize distributed systems, and expand trading capabilities globally while improving performance, stability, and usability.

Build systems, tooling, and deployment workflows to package, validate, and deliver Voyage embedding models across cloud providers and third-party environments. Improve model server performance, ensure deployment correctness and observability, debug cross-stack issues, and collaborate with model-serving teams and external partners for reliable production deployments.

Software Engineers at Citadel develop, maintain, and support high-performance trading platforms, focusing on custom software solutions and system stability.

The Senior Software Engineer will build scalable backend systems, contribute to full-stack development, collaborate on product features, and ensure code quality through reviews and CI/CD processes.

Lead engineer responsible for designing, developing, and maintaining secure, scalable payments production systems. Owns production troubleshooting, automation of recurring issues, code development and review, vendor evaluations, and driving engineering best practices across teams to improve operational stability.

Build and maintain Next.js and Contentful-driven web experiences, implement Azure Functions, apply DevOps and IaC practices, participate on-call, collaborate with engineers, designers and content creators, and continuously improve performance, testing, and platform reliability to grow Office product user engagement.

Design and implement system software and components for Azure storage virtualization, including drivers, libraries, telemetry, and diagnostics. Collaborate across teams, ensure reliability, security, testability, and monitor systems at cloud scale. Serve as on-call DRI to detect, alert, and remediate service issues.

This role involves managing data collection for training AI models, integrating infrastructure, and collaborating with scientists to improve data quality and pipeline efficiency.

Lead development of React Native + Expo mobile apps, design app architecture, build shared npm packages, integrate backend APIs, ensure secure handling of financial data, instrument and monitor apps, contribute to CI/CD and testing, and work with AI-assisted development (Claude Code) while mentoring other engineers.

Design, develop, and maintain APIs and microservices in a cross-functional team. Apply agile, TDD, and CI/CD practices, monitor system reliability, resolve issues, and provide technical leadership and mentorship while ensuring high-quality software delivery.

The Software Engineer will design, develop, and maintain backend services, focusing on APIs and collaborating with cross-functional teams to enhance user experiences and meet product objectives.

Develop, maintain and support a modular satellite imagery platform. Extend and implement APIs, server-side rendered web interfaces, troubleshoot customer deployments, mentor developers, and collaborate with multidisciplinary teams to design and deliver new platform features and improvements for earth observation operations.

Join a founding engineering team building a psychosocial safety platform. Work full-stack (SvelteKit frontend, Go backend, Postgres), deliver end-to-end features, improve UX, implement design system components, integrate third-party services, fix bugs from customer feedback, and ensure quality and ownership throughout the development lifecycle.

Build high-performance, scalable React+TypeScript web applications for payment experiences. Design reusable UI components and optimize frontend performance while collaborating with cross-functional teams on architecture, testing, accessibility, and product delivery.

Join a small cross-functional product engineering team building Clipboard. Deliver well-scoped features from ticket to production, write and review tested code, use feature flags for incremental delivery, document decisions, work with AI tooling, participate in code reviews, and help triage production issues with support.

Develop full-stack web interfaces and backend architecture for neurotechnology applications; implement neural signal processing pipelines (EEG), integrate machine learning models for neurophysiological data analysis, maintain acquisition/processing software, participate in code reviews, document technical processes, and work independently within a small, research-driven startup.