Billing Software Developer Jobs (NOW HIRING)

Populus is an amazing company where our employees stay because they love their teams and the growth opportunities. Additionally, we offer a competitive 401K match, a generous paid time off package, and Health Benefits.

Our mission is to provide a broad range of quality financial products and services delivered with best-in-class customer service. We work and lead with integrity, and we celebrate employees who exemplify our values. Come join our team!

Job Summary
The Full Stack Developer is responsible for designing, developing, testing, and maintaining software applications across all layers of the technology stack, including front-end user interfaces, back-end services and APIs, and database systems. This role operates within Populus Financial Group’s IT Application Service Management organization and supports a complex environment that includes point-of-sale (POS) systems, IBM i (AS/400) back-end processing, and store-level operations across hundreds of retail locations. This position requires strong full stack development skills along with practical experience in POS infrastructure, store data retrieval, and IBM i environments, enabling immediate contribution to both new application development and ongoing operational support needs.

Major Responsibilities

• Design, develop, and maintain full stack web applications and internal tools, encompassing front-end UI, back-end APIs, and database layers, using C#/.NET, Python, JavaScript/TypeScript, and related frameworks.
• Build and maintain RESTful APIs and back-end services that integrate with POS systems, IBM i (AS/400) DB2 data sources, and third-party platforms (MoneyGram, Ingenico, Panini, bill pay providers).
• Develop and maintain front-end user interfaces using modern frameworks (React, Angular, or Vue.js); collaborate with stakeholders to translate business requirements into functional, user-friendly screens.
• Perform store-level incident investigation and production troubleshooting, including pulling POS transaction logs, reconstructing transaction sequences, comparing store configurations, and isolating root causes.
• Execute SQL-based data extractions against IBM i DB2 (ACEDATA tables) and Microsoft SQL Server to support production troubleshooting, reporting, audits, and ad hoc analytical requests.
• Analyze and validate store-level deployment configurations; detect missed deployments, configuration discrepancies, and DLL mismatches using WinMerge and configuration file comparison techniques.
• Retrieve and deliver store artifacts including check images, receipts, and transaction records from POS store drives (via UNC path) and IBM i IFS, supporting compliance, audit, and evidence collection requests.
• Manage and maintain scheduled tasks and applications on the jump server; coordinate application deployments and service account transitions with DevOps.
• Participate in code reviews, maintain version control discipline using Git and/or TFS, and contribute to CI/CD pipeline development and deployment processes.
• Collaborate with cross-functional IT teams (DevOps, Loans, Cards, Bill Pay, Sales Audit, Banking) for issue escalation, feature delivery, and knowledge sharing.
• Maintain and synchronize project files, SQL reference queries, troubleshooting guides, and technical documentation to shared drives for team access.

Key Competencies

• Strong analytical skills for diagnosing complex issues across POS, IBM i, and web application layers; comfortable working through ambiguous problems to resolution.
• Effectively document technical processes, communicate findings to technical and non-technical stakeholders, and share knowledge across teams.
• Ability to manage multiple concurrent tasks independently and adapt quickly to shifting priorities.

Interactions

• Direct Report Title - 0
• Indirect Report Title - 0

Other Internal/External Interactions

• Internal: POS DevOps Team, Application Development Teams (Loans, Cards, Bill Pay), Sales Audit, IT Management, UX/Product Stakeholders, Compliance
• External: Store Operations personnel for urgent troubleshooting; third-party integration vendors (MoneyGram, Ingenico, bill pay providers) as needed

Physical Demands
The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the major responsibilities.
While performing the duties of this job, the employee is regularly required to sit, stand or walk; use hands to finger, handle, or feel; reach with hands and arms; stoop or bend; and talk or hear. The employee must occasionally lift and/or move up to 50 lbs. Must have appropriate vision to see up close, and at a distance with ability to adjust vision and focus.

Position Type/Expected Hours of Work
This is a full-time position. Days and hours of work are Monday through Friday, 8:00 a.m. to 5:00 p.m. This position might require long hours and weekend work.

Travel
N/A

Work Environment
The work environment characteristics described here are representative of those an employee encounters while performing the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. The noise level in some work environments can be moderate.

Disclaimer
The above information on this description has been designed to indicate the general nature and level of work performed by employees within this classification. It is not designed to contain or be interpreted, as a comprehensive inventory of all duties, responsibilities, qualifications required of employees assigned to this job.

EEO Statement
Populus Financial Group is an equal opportunity employer and complies with all applicable federal, state, and local fair employment practices laws. In compliance with applicable law, Populus Financial Group does not discriminate against any applicant or employee on the basis of race, color, religion, creed, sex, sexual orientation, gender (including gender nonconformity and status as a transgender or transsexual individual), national origin or ancestry, ethnicity, age, physical or mental disability, citizenship, past, current, or prospective service in the uniformed services, genetic information, pregnancy status, or any other protected classification. This policy applies to all terms and conditions of employment, including, but not limited to, hiring, training, promotions, discipline, compensation, benefits, and termination of employment.