Senior POS Engineer at 3Line Card Management Limited

3Line commenced business in 2007 with the primary aim of using technology to make financial services easily available to the financially excluded. We believe this is a basic human right, and 3Line is our platform for achieving this purpose. We focus on four key areas: Electronic Banking, Issuer Processing, Agency Banking and Identity Management, all driven by our Card Scheme.

Our vision is to be the second largest driver of e-Services, second only to the internet and through that, make financial services easily available to the financially excluded as a means of social reformation and transformation.

Our mission is to operate an end-to-end electronic payment system which allows organizations, government agencies, and individuals collect, bank, and transfer or withdraw money electronically anytime, anywhere, making money safe and secure at all times. To do this, we open and operate secure platforms that connect organizations with people, introduce tailor-made products and services that meet the needs of those they serve by design functions and locations, and educate the financially excluded on steps to take to achieve financial freedom.Role Description

The Senior POS Engineer is a full-time role responsible for designing, developing, and maintaining point-of-sale (POS) solutions within 3Line’s payment infrastructure. This hybrid position is based in Lagos State, Nigeria, with flexibility for some work-from-home arrangements. Day-to-day activities include integrating POS terminals with payment gateways, troubleshooting technical issues, optimizing performance, and ensuring compliance with industry standards and security protocols. The role involves collaborating with product, operations, and support teams to deliver stable, scalable POS services, as well as mentoring junior engineers and contributing to architectural decisions. The Senior POS Engineer will also participate in testing, documentation, and continuous improvement initiatives to enhance transaction reliability and user experience.

Qualifications

Strong experience in POS terminal development, integration, and maintenance, including firmware updates and device configuration.
Proficiency in programming languages commonly used for payment and POS systems (such as C/C++, Java, or similar), and familiarity with embedded systems concepts.
Knowledge of payment processing protocols and standards (e.g., ISO 8583, EMV, PCI-DSS) and secure transaction handling.
Experience working with payment gateways, card schemes, and switching platforms within a financial technology environment.
Ability to analyze logs, diagnose complex technical issues, and implement effective fixes and performance optimizations.
Strong understanding of networking fundamentals relevant to POS connectivity, including TCP/IP, SSL/TLS, and VPNs.
Excellent documentation, communication, and collaboration skills, with the ability to work effectively in cross-functional teams.
Proven experience mentoring or leading engineering team members and contributing to technical design and roadmap discussions.
Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field, or equivalent practical experience.
Minimum of 5 years work experience in the payments or fintech industry, especially within the Nigerian or African market.