At a Glance
- Tasks: Design and build innovative solutions in a fast-paced fintech environment.
- Company: Join Biller Genie, an award-winning B2B SaaS platform with ambitious growth plans.
- Benefits: Enjoy private health insurance, generous holidays, and professional development opportunities.
- Other info: Collaborative culture with a focus on innovation and career growth.
- Why this job: Make a real impact by working with cutting-edge AI tools and technologies.
- Qualifications: 5+ years of .NET experience and a passion for AI-driven engineering.
The predicted salary is between 63000 - 77000 £ per year.
Location: Belfast, Northern Ireland
Work Arrangement: Hybrid In-Office
Position Overview: We are seeking experienced AI-enabled .NET full-stack engineers who can quickly understand our existing codebase and significantly contribute to the development of complex, innovative solutions in our fast-paced fintech environment. As a key member of our engineering team, you will take ownership of significant features, driving them from conception to deployment. We need a versatile 'Swiss Army Knife'—an engineer who is comfortable across the entire SDLC, from architectural design and implementation to testing and deployment. Your experience and expertise will be vital in delivering high-quality, robust solutions. Join our growing team and make a substantial impact on our platform!
About Us: Recently ranked #482 on the Inc. 5000 fastest growing companies in the United States, Biller Genie is an award-winning B2B SaaS platform that is entering the Belfast market with ambitious plans to scale our team rapidly, with over 100 hires planned through 2026. We are an AI-enabled engineering team, and we believe the future is about empowering engineers with the latest tools, building through custom skills, agents, and harnesses, and we are looking for people who embrace AI, are excited about the future, and want to help shape the way we embed AI tooling throughout our developer experience.
Primary Job Responsibilities:
- Design & build future-proof solutions to support growing business needs while thoroughly considering the system impact
- Work closely with our senior engineers to develop solutions from idea to implementation by estimating, planning, tracking and managing progress, risks, and dependencies.
- Gather and refine requirements, and release software in a timely fashion
- Be adaptive and strike a good balance between speed and efficiency
- Work with our technical support team to identify, reproduce, and remediate bug tickets
- Build and deliver features through agentic tooling — designing, iterating on, and improving our custom skills, agents, and harnesses as part of the work
- Contribute prompts, skills, and workflow improvements back to the team so our AI-enabled developer experience compounds
- Perform other duties required by Management
Essential Criteria:
- BSc or MSc in Computer Science / related qualification OR commercial experience of developing in C#, Java or other OO programming languages
- Minimum 5 years of hands-on commercial experience programming on the .NET platform using C#, including ASP.NET (MVC)
- Experience with Design Patterns, refactoring, OO Design and related areas
- Practical hands-on experience with AI coding assistants and agentic engineering workflows, and a genuine appetite to work primarily through agents — owning architecture, review, and quality rather than typing every line
- Exposure to building web services using Web API
- An understanding of database design and development
- Hands-on experience with HTML, JavaScript, CSS including jQuery
- Strong attention to detail and work ethic
- Strong analytical and problem-solving skills
- Excellent communication (both written and verbal) and interpersonal skills
- Experience of cloud technologies such as Azure/AWS/GCP
- Previous experience working with source control tools (TFS, SVN, or GIT)
- Legal right to work in the UK
Desirable Criteria:
- Experience with Azure Functions and Queues
- Experience building custom agent skills, harnesses, MCP servers, or prompt libraries
- Experience defining evals, guardrails, or review practices for AI-generated code
- Experience in testing methodologies
- Experience of LEAN software development practices
- Knowledge of CI/CD systems and implementation practices
- Hands-on experience with front-end frameworks such as Bootstrap
- Knowledge on .NET Core and Entity framework Code First migrations
- Proficient with Claude or Claude Code
- Experience in Financial services industry
What We Offer:
- Private health insurance
- Group life death benefit
- Auto-enrollment pension with employer contributions matched to 5%
- 25 days holiday per year
- 10 statutory/bank holidays per year
- Opportunities for professional growth and development
- A collaborative and innovative work environment
Our Mission: To provide an automated A/R platform that seamlessly integrates existing business processes for the SMB market.
Our Core Values:
- Get Shit Done Right - We work hard and ensure tasks are completed correctly and on time, every time.
- Own it - We are subject matter experts who know what we know, and we are confident enough to speak up when we see something wrong.
- Catch Up - We are high performers and love a fast-paced environment.
- Believe in the Genie - We are passionate about where we are going as a team, and we show we care.
- Class Shines - We are articulate professionals who carry ourselves well and speak with purpose.
How We Work: Our engineers work with agents and harnesses as a default, not an experiment. Our interview process includes a practical exercise using AI tooling. If that sounds like the way you want to build, you will thrive here; if you would rather write every line by hand, this is likely not the right fit.
Please note we are unable to offer visa sponsorship.
Experienced Full Stack .NET Engineers employer: Biller Genie
Biller Genie is an exceptional employer, offering a dynamic and innovative work environment in Belfast, where experienced Full Stack .NET Engineers can thrive. With a strong focus on professional growth, employees benefit from private health insurance, generous holiday allowances, and a collaborative culture that embraces AI-driven development. Join us to make a meaningful impact in the fintech space while being part of a rapidly growing team that values expertise and creativity.
StudySmarter Expert Advice🤫
We think this is how you could land Experienced Full Stack .NET Engineers
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Biller Genie or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Biller Genie.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Biller Genie.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Biller Genie that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Experienced Full Stack .NET Engineers
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Biller Genie.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Biller Genie and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Biller Genie
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Biller Genie uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
