Senior Software Engineer: Full-Stack- Nigeria, Botswana, Zambia, Uganda, Tanzania

About Cellulant:

Cellulant is Africa’s leading payments company, providing seamless, secure and innovative solutions that empower businesses, banks, and global brands to thrive in a fast-changing global economy. 

With a presence in over 24 countries and 200+ payment methods, including cards, bank transfers, and mobile money, our single API payment platform, Tingg, simplifies collections, disbursements, and reconciliations. It processes over 4.5 million transactions daily for market leaders across sectors such as Airlines, Telecoms, E-commerce, Ride-Hailing, Retail, and Remittances. By simplifying how people pay and get paid, we drive trust, commerce and scale – and connect companies to their ambitions.  

Our Story:

Across Africa, payments are more than transactions. They are gateways to prosperity, connecting people, businesses and communities to opportunities and growth.

From enabling a logistics company in Lusaka to pay suppliers across borders, to enabling a hospitality brand in Lagos to scale effortlessly, to supporting an airline in Nairobi to reconcile payments from multiple platforms, Cellulant is the bridge that makes it all possible. 

Through trusted technology and customer-centric innovation, we build connections that inspire progress, strengthen economies and transform payments into a tool for progress.

Since our founding in 2003, we've continuously adapted and grown, leveraging our experiences to simplify payments for businesses. We are driven by an unshakable belief that seamless people-centred payments are the key to unlocking prosperity. 

Today, Cellulant powers online and offline payment processing, allowing businesses to collect payments, send payouts, and accelerate business growth.

Our Mission: 

To deliver seamless, secure and innovative payment solutions for businesses. 

Our Vision: 

To create a connected world where businesses move money as easily as they share ideas.

Role Overview: 

We are seeking a Senior Software Engineer: Full-stack with a strong command of modern front-end and back-end technologies, excellent code review practices, and a passion for collaboration and mentorship. In this role, you will contribute to the delivery of high-quality user interfaces with a scalable backend, provide technical leadership, and help elevate the performance of the engineering team through deep technical contributions and peer support.

What You'll do:

Code Quality & Technical Excellence

• Design and implement scalable, user-friendly full-stack applications.

• Develop efficient, lock-free SQL queries for optimal data storage, retrieval, and updates.

• Optimize application performance to achieve fast loading times.

• Build secure and scalable front-end and back-end systems capable of handling high traffic with minimal disruption.

• Create well-documented APIs for seamless third-party integration.

• Proficiency in analyzing and optimizing applications for efficient memory usage and high performance, with a solid grasp of time and space complexity.

• Can establish code quality standards; 

• Can be able to create frameworks for better code organization.

• creates standards for code reviews, implements automated quality gates;

• Drives best practices adoption

Collaboration & Cross-Functional Work

• Collaborate with:

• Product designers to translate Figma designs into performant, accessible UI components

• Backend engineers to define APIs and ensure seamless user journeys

• Actively participate in sprint ceremonies, including:

• Daily stand-ups

• Sprint planning and backlog refinement

• Retrospectives — contributing to continuous team improvement

• Lead task refinements where you are the designated Tech Owner

 Production & Operational Readiness

• Own end-to-end debugging of production issues using tools such as:

• Datadog for tracing HTTP requests

• Logging and monitoring systems to identify root causes

• Understand and leverage the team's CI/CD pipelines for efficient delivery

• Identify and share relevant documentation with new or existing team members

• Possesses a foundational understanding of at least one major cloud platform, such as AWS. 

• Proficiency in using the GIT version control system.

 Autonomy & Ownership

• Work independently with little to no supervision

• Demonstrate proactive behavior — e.g., posting status updates, reviewing PRs, and following team processes without being prompted

• Exhibit strong verbal and especially written communication skills for effective documentation and collaboration. 

• Contributes to architectural discussions by providing a benefit analysis and outlining the pros and cons of proposed approaches.

• Proactively seeks out and researches new and emerging technologies.

What we are looking for:

Technical Skills

Required Technical Skills:

Front-End Expertise:

• Advanced proficiency with the front-end technology stack, including React, TypeScript, JavaScript, and CSS-in-JS.

• Strong grasp of modern state man