Liven - Principal Full Stack Engineer

About The Role :As a Principal Full Stack Engineer, youll play a pivotal role in leading the architecture, development, and maintenance of our most critical systems - including loyalty engines, coupon frameworks, and integrated QSR applications.This is a high-impact, leadership-level role requiring deep technical expertise, a hands-on approach, and strong collaboration with stakeholders across engineering, product, and design.You'll also help explore and operationalize AI-powered tools to accelerate our product roadmap.Youll work primarily during Australian business hours (AEST/AEDT) with some flexibility.We have core collaboration hours where we expect overlap with the engineering and product teams across APAC and SEA, and occasional synchronous meetings to keep projects moving smoothly.What You'll Do :- Architect and deliver complex systems for loyalty, discounting, and customer rewards - from backend logic and APIs to seamless integrations with web and mobile apps.- Build and evolve scalable APIs using Node.js, Nest.js, and Express.js (TypeScript), enabling dynamic and rule-based engines for core product features.- Oversee the development and performance of Flutter-based applications used by large QSR brands, ensuring stability, scalability, and user-centric design.- Design robust relational data models using PostgreSQL, with efficient caching via Redis to support real-time performance.- Build secure, performant GraphQL APIs with Apollo, enabling flexible client-side data access across platforms.- Deploy, monitor, and scale services in Google Cloud Platform (GCP), leveraging automation and modern DevOps practices.- Set the standard for clean, maintainable, and testable code.- Lead code reviews and refactor legacy systems where necessary.- Collaborate closely with product managers, designers, and engineers to shape technical direction, define requirements, and deliver outcomes.- Drive the adoption of AI-powered tools to accelerate development, automate issue resolution, and improve engineering efficiency.Qualifications : - 7 - 10+ years of experience as a full-stack engineer, with a strong emphasis on backend development and scalable system architecture.- Proven track record of leading complex technical projects end-to-end, from design to deployment and iteration.Deep expertise in : - Node.js, Nest.js, Express.js (TypeScript).- GraphQL and Apollo.- PostgreSQL (relational data modelling) and Redis (caching).- Google Cloud Platform (GCP) for deployment, scaling, and monitoring.- Experience with Flutter or the ability to quickly manage and adapt to Flutter-based codebases.- Domain experience in building loyalty platforms, discounting engines, or other rule-driven systems is highly desirable.- A solid understanding of performance optimization, cloud infrastructure, and system reliability at scale.- Excellent communication and stakeholder management skills, with the ability to work cross-functionally across product, design, and engineering teams.- Full-time availability during Australian business hours (AEST) to collaborate effectively with our core team and partners.Good to Have : - Experience working with QSRs, retail systems, or other transaction-heavy domains.- Familiarity with CI/CD pipelines, automated testing frameworks, and observability tools (e.g., Stackdriver, Datadog, Sentry).- Exposure to AI/ML tools or automation frameworks for accelerating development workflows.- Experience integrating with third-party platforms such as POS systems, payment gateways, or marketing automation tools.- Strong product mindset with a focus on usability, performance, and reliability.- Contributions to open-source projects or active participation in tech communities.- Prior experience in remote-first teams, especially across time zones. (ref:hirist.tech)