Senior Full Stack Engineer - .Net / React.js

Shift

Who is Shift? At Shift, we’re business specialists dedicated to helping Australian SMEs take control of their cashflow, streamline trade terms and choose the right financial products. We believe Australian businesses are the driving force behind our economy and are core to our communities. That’s why our business expertise, focus on relationships, and market-leading technology is at the core of everything we do. We’ve helped solve the credit and payment pain points for more than 30,000 businesses, providing over $6 billion in aggregate funding. Our unique approach to product innovation combined with our collaborative culture means you can build your career in a supportive environment. You’ll be joining a diverse team of over 300 people who are always looking to deliver better outcomes for Australian businesses. About the role: We're looking for a Full Stack Software Engineer who enjoys building things end to end, from polished interfaces to the backend services that power them. This role can flex to suit you: whether you're a true 50/50 full stack engineer or someone who leans more front-end, we're interested in strong engineers who care about the whole picture. What you'll do: * Design, build, and maintain modern web applications across JavaScript/TypeScript (React) and C# (.NET) * Support and enhance backend services to keep integrations solid and systems reliable * Partner with designers and product to take ideas from concept to something users love * Contribute to architectural discussions across the stack, with a focus on maintainability and scale * Follow engineering best practices around code quality, accessibility, and continuous improvement * Stay curious about emerging technologies and share what you're learning with the team * Write high-quality, testable code that holds up in production What you'll bring: * 3+ years building production software in full stack roles * Proficiency in JavaScript/TypeScript and solid React experience, plus working knowledge of C# and .NET * Experience integrating with RESTful APIs and event-driven microservices * Familiarity with DevOps tooling like GitHub Actions, TeamCity, or Octopus * Azure or cloud experience is a bonus, not a dealbreaker * A genuine care for building interfaces that are intuitive, responsive, and accessible * Strong testing instincts and a commitment to reliable delivery * Someone who communicates well, collaborates naturally, and enjoys cross-functional work * Curious by nature and energised by learning in a fast-moving environment Key benefits: * Collaborative teams – a flat structure means everyone can learn from colleagues and senior leaders around the business. * Be involved – come together with all of your colleagues every 100 days to share the product and technology roadmap and business strategy. * Flexible working environment – we’re headquartered in North Sydney with state-based workplaces and offer a flexible work policy. * Family support – industry leading 26 weeks paid parental leave. * Purpose built spaces within our office – designed for collaboration, brainstorming, socialising, and focused work. * Range of benefits supporting your physical, psychological and financial wellbeing. From a day off on your birthday to excellent end of trip facilities. #LI-Hybrid

Shift

Who is Shift? At Shift, we’re business specialists dedicated to helping Australian SMEs take control of their cashflow, streamline trade terms and choose the right financial products. We believe Australian businesses are the driving force behind our economy and are core to our communities. That’s why our business expertise, focus on relationships, and market-leading technology is at the core of everything we do. We’ve helped solve the credit and payment pain points for more than 30,000 businesses, providing over $6 billion in aggregate funding. Our unique approach to product innovation combined with our collaborative culture means you can build your career in a supportive environment. You’ll be joining a diverse team of over 300 people who are always looking to deliver better outcomes for Australian businesses. About the role: We're expanding our engineering team and seeking a Senior Backend Software Engineer with a strong passion for designing and building robust, scalable systems. In this role, you'll focus on backend development architecting reliable services, optimizing performance, and ensuring the core of our platforms are secure and maintainable. You'll collaborate closely with product, engineering, and operations teams to deliver high-quality solutions that power great customer experiences. If you thrive on solving complex backend challenges and enjoy delivering resilient systems from design through deployment, we’d love to connect. What you'll do: * Design, build, and maintain scalable full-stack applications across C#, .NET, and React * Work closely with engineers, designers, and product to deliver features that actually move the needle * Contribute to architectural decisions and help shape a reliable microservices-based system * Hold a high bar for code quality, testing, and documentation — and help others do the same * Support DevOps practices, CI/CD pipelines, and cloud infrastructure on Azure * Get involved in code reviews, pair programming, and mentoring where it adds value * Bring a user-first mindset and a genuine appetite for continuous learning What you'll bring * 6+ years building software with C# and .NET * 3+ years working with React or similar front-end frameworks * Solid understanding of RESTful APIs and event-driven microservices * Hands-on experience with Azure or comparable cloud platforms * Familiarity with DevOps tooling like GitHub Actions, TeamCity, or Octopus * Strong testing instincts and a commitment to reliable delivery * Someone who communicates well, contributes ideas openly and enjoys working cross-functionally * Curiosity over credentials — we care more about how you think than where you've been Key benefits: * Collaborative teams – a flat structure means everyone can learn from colleagues and senior leaders around the business. * Be involved – come together with all of your colleagues every 100 days to share the product and technology roadmap and business strategy. * Flexible working environment – we’re headquartered in North Sydney with state-based workplaces and offer a flexible work policy. * Family support – industry leading 26 weeks paid parental leave. * Purpose built spaces within our office – designed for collaboration, brainstorming, socialising, and focused work. * Range of benefits supporting your physical, psychological and financial wellbeing. From a day off on your birthday to excellent end of trip facilities. #LI-Hybrid

Mongodb

MongoDB is growing its team in Sydney, focusing on building intelligent tools that help customers understand and modernise their application codebases. The Application Modernisation Platform (AMP) guides customers through the entire journey of modernising their applications — from legacy relational platforms to modern, scalable systems built on MongoDB. The App Analysis & Modelling team owns the critical first stage of this journey: building the context that powers everything downstream. The team builds code analysis tools that construct code dependency graphs and generate deep insights for codebases, giving customers a clear understanding of their existing applications before transformation begins. The team also designs schema recommendation engines that analyse signals such as existing relational schemas and query patterns to inform data modelling decisions. Our work sits at the intersection of analysis, data modelling, and AI — helping developers make confident, data-driven decisions as they transition to MongoDB. We are looking for a Senior Software Engineer who is passionate about building scalable backend systems and applications. As we expand our use of AI to power smarter analysis and recommendations, the ideal candidate will bring strong backend engineering fundamentals with the ability to contribute across the full stack. You will collaborate closely with product management and other engineering teams to design and deliver cutting-edge features that guide customers through complex modernisation journeys. We are looking to speak to candidates who are based in Sydney for our hybrid working model. THE IDEAL CANDIDATE WILL HAVE * 5+ years of commercial software development experience with strong proficiency in Python and/or Java * Extensive Experience designing and building scalable, high-performance APIs and backend services * Solid understanding of relational data modelling and SQL (Oracle, PostgreSQL, MySQL, or similar), including schema design and query optimisation * Good understanding of algorithms, data structures, and their time and space complexity * Experience with frontend development using React and TypeScript, or a demonstrated willingness and ability to work across the full stack * Degree in Computer Science or a similar field, or equivalent practical experience * Curiosity, a positive attitude, and a drive to continue learning * Excellent verbal and written communication skills NICE TO HAVE * Experience building AI-powered features, including working with Large Language Models (LLMs) and agentic workflows * Experience with code analysis, static analysis tooling, or building tools that traverse and interpret code structures programmatically * Familiarity with MongoDB * Experience with cloud-native distributed systems (e.g., Kubernetes or similar) * Contributions to open-source projects POSITION EXPECTATIONS * Contribute high-quality, well-tested code to the App Analysis & Modelling team’s backend and frontend services * Design and build scalable APIs and data pipelines that power code analysis and schema recommendation features * Collaborate effectively with Product Management, other engineers, and designers to build and deliver on the product roadmap * Participate actively in code reviews to enforce best practices and maintain a high bar for code quality * Give and solicit feedback on technical design documents and pull requests * Help troubleshoot and resolve complex technical issues across the stack * Perform tasks related to engineering process such as CI/CD, quality, and testing SUCCESS MEASURES Within the first three months, you will have: * Familiarised yourself with the MongoDB database and aggregation language * Familiarised yourself with the backend tech stack including Python, Java, and our API infrastructure * Set up your software development environment and begin contributing to the codebase * Started collaborating with your peers and contributed to code reviews and design discussions Within six months, you will have: * Familiarised yourself with the full stack including the React/TypeScript frontend * Worked on and delivered a large-scale feature in the product * Contributed to and helped deliver multiple product releases * Reviewed and contributed to scope and technical design documents Within twelve months, you will have: * Become a key contributor to the team, capable of owning complex features independently * Delivered at least one large-scale feature that spans the entire tech stack * Helped recruit and interview new members of the team * Collaborated effectively with other teams at MongoDB on cross-functional projects ABOUT MONGODB MongoDB is built for change, empowering our customers and our people to innovate at the speed of the market. We have redefined the data platform for the AI era, enabling builders to create, transform, and disrupt industries with software. MongoDB’s unified data platform, the most widely available, globally distributed data platform on the market, helps organizations modernize legacy workloads, embrace innovation, and unleash AI. Our cloud-native platform, MongoDB Atlas, is the only globally distributed, multi-cloud data platform and is available across AWS, Google Cloud, and Microsoft Azure. With offices worldwide and over 67,000 customers, including 75% of the Fortune 100 and AI-native startups, relying on MongoDB for their most important applications, we’re powering the next era of software. Our compass at MongoDB is our Leadership Commitment, guiding how and why we make decisions, show up for each other, and win. It’s what makes us MongoDB. To drive the personal growth and business impact of our employees, we’re committed to developing a supportive and enriching culture for everyone. From employee affinity groups, to fertility assistance and a generous parental leave policy, we value our employees’ wellbeing and want to support them along every step of their professional and personal journeys. Learn more about what it’s like to work at MongoDB, and help us make an impact on the world! MongoDB is committed to providing any necessary accommodations for individuals with disabilities within our application and interview process. To request an accommodation due to a disability, please inform your recruiter. MongoDB is an equal opportunities employer. Requisition ID 4263333173