Senior POS Engineer

About the role

3Line is a payment partner providing complete payment infrastructure, and is hiring a full-time Senior POS Engineer to design, develop and maintain point-of-sale solutions within its payment infrastructure. The position is hybrid, based in Lagos State, Nigeria, with flexibility for some work-from-home arrangements.

Key responsibilities

• Integrate POS terminals with payment gateways and troubleshoot technical issues.
• Optimize performance and ensure compliance with industry standards and security protocols.
• Collaborate with product, operations and support teams to deliver stable, scalable POS services.
• Mentor junior engineers and contribute to architectural decisions.
• Take part in testing, documentation and continuous improvement initiatives to improve transaction reliability and user experience.

Required profile

• Bachelor's degree in Computer Science, Engineering, Information Technology or a related field, or equivalent practical experience.
• At least 5 years of work experience in payments or fintech, especially in the Nigerian or African market.
• Proven experience mentoring or leading engineering team members and taking part in technical design and roadmap discussions.

Required skills

• POS terminal development, integration and maintenance, including firmware updates and device configuration.
• Programming such as C/C++ or Java, and familiarity with embedded systems.
• Knowledge of payment protocols (ISO 8583, EMV, PCI-DSS) and secure transaction handling.
• Experience with payment gateways, card schemes and switching platforms.
• Log analysis, diagnostics and performance optimization.
• Networking fundamentals: TCP/IP, SSL/TLS and VPNs.