I’m working with an fintech company, backed by €50M in investment, whose platform powers critical operations across the financial and investment industry.

They are looking for a Principal Software Engineer to play a key role in the next stage of their growth. This is an opportunity for someone who enjoys staying close to technology while taking ownership of key technical decisions across architecture, scalability, engineering standards and platform strategy.

You will have the opportunity to lead one of the first engineering teams being built in Ireland, playing a central role in an exciting growth journey. As the business continues to scale, you will be part of shaping the engineering function, building out the team and contributing directly to the wider technology roadmap.

What’s in it for you?

Become a key technical voice within a growing investment technology business
Shape the architecture and long-term technical strategy of a mission-critical platform
Lead and mentor a team of experienced Software Engineers
Work closely with senior Engineering, Product and business stakeholders

What You Bring

10+ years of Software Engineering experience
Experience leading and developing teams of Software Engineers
Strong hands-on background in C# / .NET
Proven experience designing and scaling complex software platforms

This is more than a senior technical role. It’s an opportunity to take real ownership of a growing platform and help define the engineering direction of a business operating at the heart of the investment technology space.

I specialise in recruiting Software Engineering and Technology professionals across Ireland.

Interview prep pack

Grounded in this listing. Use it to prepare examples before you apply.

Your interview focus

Based on this listing, the Principal Software Engineer role is a hands-on technical leadership position focused on shaping the architecture, scalability, and engineering standards of a mission-critical investment platform, while building and mentoring a new engineering team in Ireland.

Technical Leadership·Medium
Hands-on Engineering·Medium
Architecture & Scalability·Medium
Team Building & Mentoring·Medium

Only have 30 minutes?

Follow a focused preparation plan based on this job.

Start 30-minute prep

Your 30-minute plan

Review Advanced C# / .NET Concepts
0–8 min
Spend time revisiting advanced features, architectural patterns, and recent developments in the .NET ecosystem.
Prepare Platform Architecture Stories
8–15 min
Select and outline 1-2 detailed examples of platforms you have designed and scaled, focusing on technical and business outcomes.
Summarize Leadership and Mentoring Achievements
15–20 min
List specific instances where you built, led, or mentored engineering teams, including measurable results.
Research the Investment Technology Sector
20–25 min
Familiarize yourself with current trends and challenges in investment technology to contextualize your experience.
Draft Role-Specific Questions
25–30 min
Prepare thoughtful questions about the company's technical challenges, team structure, and expectations for the role.

Likely questions

Expand all

Priority reflects how strongly this topic is emphasised in the job listing, not whether it will be asked.

1Can you describe a time when you architected and scaled a complex software platform?High
Why they may ask
To assess your experience with designing and scaling mission-critical systems.
Prepare to discuss
- Clearly outline the business context and technical challenges.
- Describe your architectural decisions and rationale.
- Explain the impact on scalability, reliability, and business outcomes.
Tip: Use a recent, relevant example and quantify results where possible.
2How have you led and developed engineering teams in the past?High
Why they may ask
To evaluate your leadership and mentoring capabilities.
Prepare to discuss
- Describe your approach to team building and talent development.
- Share specific examples of mentoring or coaching engineers.
- Highlight outcomes such as improved performance or retention.
Tip: Emphasize both strategic and hands-on leadership.
3What is your experience with C# / .NET in building enterprise-grade applications?High
Why they may ask
To confirm your technical depth in the required stack.
Prepare to discuss
- Discuss recent projects using C# / .NET.
- Explain architectural patterns or frameworks you have used.
- Highlight performance, security, or scalability considerations.
Tip: Be specific about your hands-on contributions.
4How do you approach setting and enforcing engineering standards across a team?Medium
Why they may ask
To understand your ability to drive quality and consistency.
Prepare to discuss
- Describe processes or tools you have implemented.
- Share how you gained team buy-in.
- Explain the impact on code quality and delivery.
Tip: Include both technical and cultural aspects.
5Describe a situation where you influenced technical direction in collaboration with product or business stakeholders.Medium
Why they may ask
To assess your ability to align technical and business goals.
Prepare to discuss
- Explain the context and stakeholders involved.
- Describe your communication and negotiation approach.
- Share the outcome and lessons learned.
Tip: Showcase your cross-functional leadership.
6What strategies do you use to ensure platform scalability and reliability as the business grows?Medium
Why they may ask
To evaluate your forward-thinking and technical planning skills.
Prepare to discuss
- Discuss architectural patterns or technologies you leverage.
- Share monitoring and testing approaches.
- Explain how you anticipate and address scaling challenges.
Tip: Relate your answer to investment or financial platforms if possible.

Talking points

Architecting and Scaling Complex Platforms
You will need to demonstrate experience designing robust, scalable systems—prepare examples of platforms you have architected and scaled, especially in high-stakes or financial environments.
Technical Leadership and Team Development
The role requires leading and mentoring engineers; be ready to discuss how you have built, developed, and inspired high-performing teams.
Hands-on C# / .NET Expertise
A strong background in C# / .NET is essential; prepare to discuss your technical depth, recent projects, and how you stay current with the stack.
Stakeholder Collaboration
You will work closely with engineering, product, and business stakeholders; have examples ready of cross-functional collaboration and influencing technical direction.
Defining Engineering Standards and Best Practices
Setting and upholding engineering standards is key; be prepared to share how you have established or improved standards in previous roles.

What to research

C# / .NET Technical Review
Refresh your knowledge of advanced C# / .NET features, frameworks, and best practices relevant to enterprise platforms.
Platform Architecture Case Studies
Prepare detailed examples of platforms you have architected and scaled, focusing on technical decisions and business impact.
Team Leadership and Mentoring Examples
Gather stories and metrics demonstrating your experience building, leading, and mentoring engineering teams.
Stakeholder Engagement
Review your experience collaborating with product, business, and engineering stakeholders to drive technical strategy.

Questions to ask

What are the immediate technical challenges facing the platform as the team grows in Ireland?
Why ask this? To understand the current priorities and where your expertise can have the most impact.
How is technical decision-making structured between engineering, product, and business stakeholders?
Why ask this? To clarify your role in shaping the platform's direction and collaborating cross-functionally.
What are the expectations for building and scaling the engineering team in the first year?
Why ask this? To gauge the scope of your leadership and team-building responsibilities.
How does the company approach engineering standards and continuous improvement?
Why ask this? To assess the culture of quality and innovation within the organization.
What does success look like for this role in the first 6-12 months?
Why ask this? To align your efforts with the company's goals and expectations.
How does the platform support mission-critical operations for its financial clients?
Why ask this? To better understand the business context and technical requirements.

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Apply NowApply before: 8 Oct 2026

Principal Software Engineer – Shape the Future of Investment Technology!

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