Senior Fullstack Engineer - Technical Lead Pathway | .NET, React, Azure

PARts Australia; Sydney; Hybrid; AUD 140,000 - 180,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

PARts Australia is seeking a Senior Fullstack Engineer on a Technical Lead pathway in Sydney. You will lead design and delivery of the most complex, high-risk work across streams, owning architectural decisions and mentoring teams.

Strong backend in C#/.NET Core with React skills is required, and Azure experience is highly valued. The role offers hybrid work, modern engineering practices, and opportunities to grow into a Technical Lead.

Qualifications

• Strong backend depth in C#/.NET Core with React frontend.
• Experience building scalable web APIs and cloud-native SaaS apps.
• Azure preferred; AWS/GCP accepted with Azure readiness.
• Degree in CS/IT/SE or equivalent practical experience.

Responsibilities

• Lead design and delivery of complex, high-risk work across streams.
• Own architectural decisions for security, performance and data integrity.
• Mentor engineers and collaborate with product managers and stakeholders.
• Drive CI/CD, automation, testing, and DevOps practices.

Skills

C#/.NET Core

React

Azure

CI/CD

DevOps

AI tools

Education

BSc/BE in CS/IT/SE

Tools

Next.js

Azure

SQL/NoSQL

Cloud platforms

Job description

Senior Fullstack Engineer - Technical Lead Pathway | .NET, React, Azure

PARtsDB builds the B2B fitment data and catalogue platform that sits underneath the automotive parts supply chain. When a workshop, retailer or distributor can tell you in seconds whether a part fits a given vehicle, that answercamefrom a platform like ours.

We have25+years of proprietary fitment data behind us - one of the deepest data sets of its kind in the region - and the backing of GPC Asia Pacific. That combination is unusual: the data depth and stability of a large group, with the pace and short decision paths of a team small enough that your work is visible.

Vehicle fitment is a genuinely hard data problem. High cardinality, messy real-world sources, unforgiving accuracy expectations, and commercial weight behind every answer. It is not CRUD.

The role - and why we have pitched it where we have

We would rather hire someone with the capability to lead a stream and grow into the title than someone who already has the title on their CV. If you are a strong Senior Developer who has been shaping technical design, lifting the people around you and doing lead work without the badge, this is the role where you get the badge - and the support to grow into it.

You will join as a Senior Engineer reporting to the Head of Engineering, with a mapped path to Technical Lead: a defined set of readiness indicators, a development plan against them, and a manager who will tell you plainly what is still missing. Move faster thanexpectedand the title follows.

What you will be doing

Leading design and delivery of the most complex,noveland highest-risk work in your stream - cross-system builds, migrations, and performance and scalability problems.

Owning the technical design of what your stream ships and making the architectural calls that go with it: security, performance, scalability, dataintegrityand operational cost.

Staying hands-on. This is a technical leadership role, not a step away from the keyboard.

Setting the quality bar - thorough code review, engineering-led QA, automation, integrationtestingand CI/CD discipline.

Owning root cause analysis and durable resolution for significant production incidents in your stream.

Mentoring Developers, Juniors and Graduates through pairing, reviewcoachingand input into their development plans

Working directly with Product Managers, businessstakeholdersand vendors, translating technical trade-offs into decisions they can act on.

Growing into the lead: contributing to estimation, planning and stream direction,deputisingfor the Technical Lead, and building the people-leadership side deliberately rather than by accident.

Setting the standard for AI-assisted development - high throughput on complex work with rigorous verification, and clear judgement about where the tools can and cannot be trusted.

What we are looking for - capability, not years

We are assessing what you can do and how fast you grow, not counting service. In practice this capability tends to show up somewhere around the five-year mark, but if you have itearlier,we want to hear from you.

You are the person complex work already gets routed to, and it comes back done.

You make design calls and can explain clearly why you made them.

You lift the people around you - review feedback that teaches, not just corrects.

You are comfortable with ambiguity: you interpret the problem, shape thesolutionand own the outcome.

You communicate rather than go quiet, particularly when something is going wrong.

You want to lead a team, and you are honest about the parts of that you have not done yet.

Your technical background

Strong backend depth in C# / .NET Core, with solid front-end capability in React (Next.js an advantage).

Proven experience building and scaling modern web applications, APIs and services in a cloud-native SaaS environment.

Azure preferred. We are open to AWS or GCP backgrounds where you have moved between platforms before or can show you have done the homework to pick Azure up quickly.

Database design across relational and non-relational stores, with a focus on performance and data integrity.

Secure development practice you can embed in a team, not just apply yourself.

CI/CD and DevOps as part of how you work, not a separate function.

Expert and judicious use of AI development tools, with the ability to teach and standardise that usage.

Strong Agile Scrum fluency; experience working with offshore teams is an advantage.

Degree in Computer Science, IT or Software Engineering, or equivalent practical experience.

This is not a role for a pure specialist, or for someone who wants a defined queue of tickets. You will be expected to think, decide and own outcomes across the stack.

How we actually work

We asked our own engineers what they would tell a friend about working here. Four things came back, and they are the reason people stay:

Real variety. You work across different technologies and different parts of the business, not a single narrow lane - which is the fastest way we know to build the breadth that gets you to the next level.

Trust over process. We are light on micromanagement and heavy on outcomes. People here are trusted to work out the best way to get there and given room to try new ideas.

No blame culture. When something goes wrong, we work out why and make it better. That is precisely why people here take on work that stretches them.

Approachable people who share what they know. If you are stepping up a level, that matters more than any career framework.

Alongside that:

A defined engineering pathwaywith plenty of growth opportunity.

A prime Sydney CBD office with genuine hybrid flexibility.

Modern engineering practice on a platform that is being actively modernised, not maintained.

And customers who depend on us getting the answer right.