Looking for a job

Daniel Akinsanya

@danielakinsanya

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I build secure fintech microservices, payment systems, and Stellar smart contracts using Java, Rust, and TypeScript.

Nigeria

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What I'm looking for

I'm looking to build secure, scalable backend and financial systems, including payment infrastructure and Rust/Soroban smart contracts, while collaborating with cross-functional teams on complex technical problems.

At KARRABO, I build secure financial transaction services using ISO 8583, including parsers and builders for authorizations, reconciliations, settlements, and reversals. I also implement secure key exchange and VPN connectivity for payment processors.

I develop modular microservices for terminal inventory, profiling, deployment, support, and lifecycle management. Using Apache Pulsar, Hexagonal Architecture, and RESTful APIs, I help keep terminal operations reliable and event-driven.

Previously at Crosspoint Finance, I improved application security by 80%, reduced vulnerabilities by 30%, and cut API response times by up to 40%. I integrated Stripe, PayPal, Twilio, SendinBlue, and QoreID while building Java and Spring-based services.

I also build on Stellar with Rust and Soroban. My projects include AJOFI, a trustless rotating-savings protocol, and StellarMarket, an open-source decentralized freelance marketplace maintained by 100+ contributors.

Experience

Work history, roles, and key accomplishments

Current

Backend Software Engineer

Current

KARRABO

Feb 2024 - Present (2 years 7 months)

Designed and developed ISO 8583 parsers and builders for financial transactions, implemented secure key exchange and VPNs, and integrated with payment providers like Interswitch and Zone. Utilized Apache Pulsar for event-driven microservices and adopted Hexagonal Architecture.

Java Spring Boot ISO 8583 Apache Pulsar VPN REST APIs Microservices Hexagonal Architecture Docker Jenkins AWS

Backend Software Engineer

Crosspoint Finance

Oct 2022 - Jan 2024 (1 year 3 months)

Designed and implemented RESTful APIs, enhanced security by 80% using Spring Security and OAuth 2.0, optimized database queries reducing response times by 40%, and integrated payment gateways like Stripe and PayPal.

Java Spring Boot Spring Security OAuth RabbitMQ REST APIs MySQL PostgreSQL Stripe PayPal Twilio SendinBlue QoreID

Software Engineer Intern

Crosspoint Finance

Jul 2022 - Oct 2022 (3 months)

Collaborated on microservices development using Spring Boot and Java, designed RESTful APIs, conducted testing improving system functionality by 25%, and engineered user interfaces enhancing engagement by 15%.

Java Spring Boot REST APIs Microservices Testing UI Development

Software Engineer Digital Trainee

Semicolon Africa

Apr 2021 - Jun 2022 (1 year 2 months)

Developed back-end systems for e-commerce and social media using Java, Spring Boot, Node.js, and Express.js. Collaborated in agile environments, resolved build issues, and implemented robust authentication.