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: Hybrid work model, competitive salary, and opportunities for professional development.
- Other info: Be part of a dynamic team with excellent career growth opportunities.
- Why this job: Make a real impact by shaping the future of AI-enabled engineering.
- Qualifications: Experience in .NET development and a passion for AI-driven solutions.
The predicted salary is between 63000 - 77000 £ per year.
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 2 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.
Full Stack .NET Engineer 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.
