Hamza S.
Software Developer
Experience
Sep 2025 - Present
3 monthsSoftware Developer
WaslSign
- Designed and implemented the system architecture for scalable document workflows, improving stability and performance.
- Optimized the login flow with TOTP-based MFA, reducing complexity and login time by 35%.
- Built secure backend APIs for document upload, signing, and management.
- Developed encrypted file handling with AWS S3 pre-signed URLs, ensuring GDPR-compliant data protection.
- Implemented JWT-based role authentication, strengthening access control and overall platform security and reducing code and database complexity.
- Optimized database queries and caching using ORM, reducing API response time by 40%.
- Integrated real-time webhook updates, enhancing workflow transparency and user experience.
Mar 2025 - Sep 2025
7 monthsSoftware Engineer
PAYSYS LABS Pvt Ltd
- Designed and implemented POS and QR Soundbox payment systems, streamlining the full transaction lifecycle.
- Built Raast One Link modules in line with State Bank of Pakistan compliance, improving merchant onboarding efficiency.
- Developed static QR generation and real-time MQTT communication, enhancing transaction reliability and device sync.
- Implemented Maker-Checker-Approver workflows using Flowable BPMN and Camunda, reducing approval delays by 30%.
- Optimized PostgreSQL queries and indexing, improving transaction performance and scalability by 40%.
- Fixed security bug making the application secure by 30%.
- Collaborated with QA and DevOps teams to ensure secure API performance.
Feb 2024 - Mar 2025
1 year 2 monthsSoftware Engineer
iPath Pvt Ltd
- Developed ReconX Reconciliation Software using Spring Boot for transaction matching across MasterCard, PayPal, and Stripe, improving accuracy and automation.
- Built and integrated RESTful APIs for third-party payment services, enabling seamless data exchange and reconciliation.
- Implemented Jasper Reports for advanced financial insights reducing code complexity.
- Secured traffic via API Gateway and introduced licensing services, ensuring controlled API usage and access.
- Optimized SQL queries and indexing and code perfomance, boosting processing speed for high-volume financial data by 35%.
- Automated data parsing and reconciliation for multiple file formats, reducing manual effort and processing time.
Nov 2023 - Feb 2024
4 monthsJava Intern
iPath Pvt Ltd
- Strengthened core Java and OOP fundamentals, building a solid foundation for backend development.
- Developed RESTful APIs with Spring Boot, improving understanding of scalable service design.
- Optimized PostgreSQL queries, enhancing database efficiency and application performance.
- Built a custom API mocking tool (similar to Mockoon) with extended functionality for realistic backend simulation.
- Mocked complex transaction APIs, ensuring accurate test coverage and validation of business logic.
- Deployed and maintained Java web applications on Apache Tomcat, gaining experience in deployment and lifecycle management.
Summary
I am a software developer with a passion for creating efficient and innovative solutions. With a deep fascination for technology and a drive to create innovative solutions, I am dedicated to honing my skills and expanding my knowledge in the field I am eager to contribute my creativity and problem-solving abilities to build software that enhances user experiences.
Languages
Urdu
NativeEnglish
AdvancedGerman
ElementaryEducation
Oct 2025 - Present
TU Dortmund
Master in Data Science · Information and Communication Technologies · Dortmund, Germany
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