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Aaron masembe mujabi kalibala

@aaronmasembemujabika

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Backend engineer at Mamastops building cross-border payment integrations and closing 42 production defects.

Zambia

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What I'm looking for

I'm open to backend, platform and application security roles, remote or Lusaka-based.

At Mamastops, I build and run payment infrastructure for a cross-border logistics platform, including Airtel Money, M-Pesa and MMG integrations. I established a systematic code-review practice that closed 42 defects in three months, including high-severity authentication and transaction-integrity issues.

Outside Mamastops, I run Sulfame Technologies, where I built SFM TMS, an offline-first transport management platform using Go, Flutter and Next.js. I also work on Kubernetes and AWS deployment infrastructure and take production on-call incidents through diagnosis and fixes.

Experience

Work history, roles, and key accomplishments

Current

Backend Software Engineer

Current

Mamastops

May 2025 - Present (1 year 5 months)

• Established a systematic code-review practice across a production logistics-payments platform, identifying and closing 42 defects over three months — including ten high-severity authentication and transaction-integrity issues, a revenue-leaking billing gap, and several concurrency defects in wallet debiting. Traced individual findings to their whole class rather than patching instances.

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Junior IT Technician

Chililabombwe Municipal Council

Dec 2024 - May 2025 (5 months)

Managed to Troubleshoot network problems
Installation procedures and develop innovative ways to send documents securely over the internet

Student Teacher

Kenneth Kaunda Secondary/Stem School

May 2024 - Aug 2024 (3 months)

Teaching Mathematics and Computers studies to Grade 8 - 12.
Mentored Students on JETS(Junior Engineers, Technicians and Scientists) Competition for 2024; and came out first place for muchinga province.

Education

Degrees, certifications, and relevant coursework

The CopperBelt University

Bachelor of Science, Information Technology with Education

2021 - 2024

I'm an IT student who has experience in software engineering, database management, teaching, and networking concepts(Cisco). I've projects that showcase my skills posted on my github account;