Biller Genie Logo

Biller Genie

Lead Full Stack .NET Developer (Belfast, NI)

Sorry, this job was removed at 10:08 a.m. (GMT) on Friday, Dec 12, 2025
Be an Early Applicant
In-Office
Belfast, County Antrim, Northern Ireland
In-Office
Belfast, County Antrim, Northern Ireland

Similar Jobs

21 Hours Ago
Hybrid
Belfast, County Antrim, Northern Ireland, GBR
Senior level
Senior level
Fintech • Software • Financial Services
The Staff Platform Engineer will design and optimize API edge services and infrastructure while collaborating with teams to ensure robust API management and high performance.
Top Skills: AnsibleAWSDockerGCPKubernetesNginxTerraform
Yesterday
Hybrid
Belfast, County Antrim, Northern Ireland, GBR
Senior level
Senior level
Information Technology • Professional Services • Software • Energy
As a Staff Software Engineer, you'll lead the design and delivery of services within a service-oriented architecture, collaborating with cross-functional teams to enhance platform capabilities.
Top Skills: DockerGoogle Cloud PlatformKafkaKotlinKubernetesMaterial-UiMongoDBNext.JsNode.jsPostgresReactSpring BootTemporalTypescript
Yesterday
Remote or Hybrid
Belfast, County Antrim, Northern Ireland, GBR
Expert/Leader
Expert/Leader
Artificial Intelligence • Cloud • Information Technology • Sales • Security • Software • Cybersecurity
The Principal AI Engineer designs and implements advanced AI models, mentors the team, and ensures scalable, secure solutions in a dynamic environment.
Top Skills: Aws BedrockCrewaiHuggingfaceKerasNumpyPandasPythonPyTorchSagemakerScikit-LearnTensorFlowTransformers
Job Title: Lead Full Stack .NET Developer
Location: Belfast, Northern Ireland
Work Arrangement: Hybrid (In-Office)
We are seeking a Lead Full-Stack .NET Developer to provide architectural vision and strategic direction, guiding our team in efficiently understanding and extending our codebase. In this pivotal role, you will collaborate closely with Product and Engineering leadership to deliver innovative, scalable solutions in a dynamic fintech environment. As a technical leader, you’ll embody the 'Swiss Army Knife' ethos—excelling in all phases of the SDLC, from defining high-level architecture and future-proofing designs to hands-on development, mentoring, and ensuring code quality. Your expertise will be crucial in shaping our technical roadmap and driving our team to deliver exceptional results. Join us and lead the charge in building the future of fintech!
About Us: Recently ranked #259 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. 
Primary Job Responsibilities:
  • Design & build future-proof solutions to support growing business needs while thoroughly considering the system impact
  • Mentor and lead our 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
  • 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 7+ years of hands-on experience programming on the .NET platform using C#, including ASP.NET (MVC)
  • Expertise with Design Patterns, refactoring, OO Design and related areas
  • Experience in Web API design principles and best practices
  • Comfortable with 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)
  • Experience leading / mentoring a small team of Engineers in all aspects of product development
  • Legal right to work in the UK
Desirable Criteria:
  • Experience with Azure Functions and Queues
  • Hold a Cloud certification
  • Experience in testing methodologies
  • Experience in Financial services industry
  • 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
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.
Please note we are unable to offer visa sponsorship.

What you need to know about the Belfast Tech Scene

If asked to name the birthplace of the RMS Titanic, you might not say Belfast. Similarly, if asked to name Europe's leading destination for foreign direct investment in new software development, Belfast might not come to mind. Yet, both are true. The city has emerged as a tech powerhouse, recently ranked among the best in the U.K. for tech careers — especially for software developers. It also leads the U.K. with the highest percentage of software development jobs advertised.

Sign up now Access later

Create Free Account

Please log in or sign up to report this job.

Create Free Account