Lead Software Engineer (.Net)

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Mantel is an Australian-owned, IT Professional Services consultancy, focused on emerging technology to help advance our clients by leveraging AI, Digital, Cloud, Data & Security technology. We are a fully AI-enabled technology consultancy and the partner that bridges the gap between blue-sky ambition and practical steps to deliver value. Since our inception in November

• , we have experienced remarkable growth across Australia & New Zealand and are honoured to be recognised as a Great Place to Work for 6 years in a row!

We hire smart and talented people and get out of their way. As a principle-based organisation we have a flat structure with no hierarchy. By focusing on our five principles and not getting caught up in red tape, we trust you to get the job done!

Our Digital team works collaboratively to develop end-to-end digital solutions, ranging from technology selection to building and operating phases. Spanning both software and hardware deployments, we deliver and manage scalable, cloud-focused, automated solutions – focused on shared knowledge, continuous improvement and design thinking.

About the role

As a Senior Software Engineer, you will enjoy working on a diverse and exciting range of projects across various clients and industries. We are a technology-agnostic business that opens endless possibilities for you to work across multiple tech stacks and platforms with the opportunity to up-skill and cross-skill. We will always evolve as the technology landscape changes so we both won't be left behind!

Your day to day

Implement technology solutions that meet and exceed customer requirements and expectations

Develop high-quality code that can function with existing code, patterns and architectural techniques

Leverage and advocate for AI-assisted development tools (e.g., Claude / Cline) to accelerate development

Implement structured agentic workflows (setup-plan-act) across team development practices

Lead by example in reviewing and refining AI-generated code, ensuring it meets architectural standards

Effectively utilise development best practices such as CI / CD and test integrations

Ensure appropriate quality is maintained through practices such as unit testing

Design systems that can be managed effectively in production environments

Help our clients maintain and run reliable applications and systems

Lead teams – delegate effectively, communicate and develop others

Proactively identify and address issues outside of direct responsibility

Be a go-to expert in one or more technical areas

Use professional judgement while treating colleagues and clients with respect and compassion, and a demonstrated ability to display our five Mantel principles

What you'll need to be successful

Development experience within a Microsoft environment (C#, .NET)

Experience developing applications, consuming and developing APIs, and following technical best practices & design patterns

Demonstrated skills writing automated test routines for developed code including unit, regression, performance, and load testing

Dedication to software development best practices such as CI / CD

A passion for sharing your knowledge with others, a willingness to tackle the tricky problem and get hands-on by pair programming with colleagues

At Mantel, we want you to be yourself. We trust our team members to use their professional judgement while treating colleagues and clients with respect, compassion, and professionalism in alignment with our five principles.

You take ownership, always stepping up to help and prioritising your teammates. You're also a clear, kind communicator who makes sound decisions based on good judgement.

What you can expect from us

We believe in unique experiences for all. Our My Deal program allows you to tailor your yearly plan, with the support of your Leader, to decide on what's most important to you. That might be extra professional development, extra annual or parental leave, time to work on your side hustle, or something else completely different! One size does not fit all.

You'll get all the tools you need to hit the ground running including a new phone, laptop & swag.

A true investment in your AI-first career. We are a fully AI-enabled consultancy and provide you with the tools to lead. This includes access to the Mantel AI Gateway, our secure, centralised platform with multiple AI models, plus a dedicated monthly budget and a safe environment to experiment and innovate.

You'll be genuinely supported by an organisation that cares about not only you but your family as well, Mantel offers Flexible Personal Leave options for those unplanned moments in life.

We support a flexible hybrid approach to working which is guided by our principles; we trust each other to "make good choices" about the best workplace locations for the requirements of the project, role and client. This can change based on our client needs.

Mantel is a certified Family Inclusive Workplace, which means we are committed to improving your wellbeing at work through leading practices on flexible work, parental leave, family care and family wellbeing.

We know you won't have one job for life. At Mantel, we believe in supporting our team to take their career in a direction that aligns with their passions. We have internal opportunities across Cloud, Data, Security and Digital.

Our elite partnerships are a direct result of our deep platform mastery. For you, this means you'll be working alongside teams with the highest levels of technical expertise and tackling the most complex, high-profile projects on the market. Check out our partner awards and recognitions here.

Click 'Apply for this job' to be considered for this role and our Talent team will be in touch.

We value a diverse workplace and strongly encourage people from all backgrounds and minority groups to apply.

Referrals increase your chances of interviewing at Mantel by 2x.

Job Details

Seniority level : Mid-Senior level

Employment type : Full-time

Job function : Information Technology

Industries : IT Services and IT Consulting

Location : Sydney, New South Wales, Australia

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