# Daniel Akinsanya

Daniel Akinsanya is a remote worker on Himalayas, Backend Software Engineer at KARRABO, based in Nigeria.

Source: https://himalayas.app/@danielakinsanya

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

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | Nigeria |
| Authorized to work in | Nigeria |
| Salary expectations | 61k+ USD |
| Job categories | Backend Engineer, Software Engineer, Blockchain Developer, Smart Contract Developer |
| Skills | Java, Rust, JavaScript, TypeScript, Spring Boot, ExpressJS, NodeJS, Next.js, MySQL, PostgreSQL, MongoDB, Prisma, REST, gRPC, JSON, JPA, ISO 8583, Microservices Architecture, Hexagonal Architecture, Layered Architecture, Monolithic Architecture, Modular Architectures, Apache Pulsar, RabbitMQ, Kafka, Spring Security, JWT, OAuth, Keycloak, Secure Key Exchange, API Rate Limiting, Smart Contract Security, Soroban SDK, Soroban Smart Contracts, Stellar, Maven, Gradle, Cargo, Junit, Mockito, Docker, Jenkins, AWS, Heroku, Git, GitHub, Gitlab, VPN, SSL, HTTPS, Agile, Scrum, Test Driven Development, Pair Programming, Object Oriented Programming, Functional Programming, Software Development Lifecycle, SOLID Principles, Data Structures, Algorithms, Design Patterns, UML, Postman, Swagger, Vercel, Thyme Leaf, Payment Gateway Integration, Application Security |
| Website | https://useajofi.xyz |
| Portfolio | https://github.com/dannyy2000/ajofi |
| LinkedIn | https://linkedin.com/in/akinsanya-daniel |
| GitHub | https://github.com/dannyy2000 |

## What I'm looking for

```text
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.
```

## About

```text
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

### Backend Software Engineer (current)

KARRABO. Feb 2024 - Present

```text
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.
```

Skills: 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

```text
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.
```

Skills: 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

```text
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%.
```

Skills: Java, Spring-Boot, REST-APIs, Microservices, Testing, UI-Development

### Software Engineer Digital Trainee

Semicolon Africa. Apr 2021 - Jun 2022

```text
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.
```

Skills: Java, Spring-Boot, JavaScript, NodeJS, ExpressJS, REST-APIs, Agile, UML, CI-CD

## Education

### University of Reading (Henley Business School)

Certification, Business Management and Entrepreneurship

```text
Completed a certification in Business Management and Entrepreneurship in April 2023.
```

### University of Lagos

Bachelor of Science, Physics. 2016 - 2020

```text
Bachelor of Science in Physics from the University of Lagos, completed in 2020.
```

## Tech stack

- Postman
- GitHub
- GitLab
- Jenkins
- Stellar
- MySQL
- PostgreSQL
- MongoDB
- Node.js
- Spring Boot
- Next.js
- Gradle
- Thymeleaf
- JavaScript
- Java
- JSON
- Rust
- Kafka
- RabbitMQ
- Apache Pulsar
- ExpressJS
- Heroku
- Prisma
- gRPC
- Spring Security
- Vercel
- TypeScript
- JUnit
- Mockito
- Keycloak
- Git
- Docker

To contact Daniel, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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