
obiefuna ezeani
@obiefunasylvain
Senior Backend Engineer | C#/.NET | ASP.NET Core | Distributed Systems
What I'm looking for
Backend engineer with over 6 years of experience building systems with C# and .NET. My work has focused on APIs, distributed services, integrations and transactional systems, including banking and payments. I work across application design, data access, service integration, reliability, security and automated testing. I am interested in senior backend and software engineering roles with remote-first international teams, particularly where modern .NET and cloud technologies are part of the engineering environment.
Experience
Work history, roles, and key accomplishments
Senior Backend Engineer
Guaranty Trust Bank Ltd
Jun 2024 - Present (2 years 3 months)
Build backend services for identity and KYC workflows supporting customer onboarding. Work across identity validation, integrations, authentication and resilience. Increased unit test coverage from near zero to about 90%, added automated security checks to the pull request workflow, and improved resilience across service calls. Collaborate with distributed engineering teams on code and security reviews.
Work on the bank's identity and KYC platform, supporting customer onboarding across domestic and international channels. Increased unit test coverage from near zero to 90% and integrated security tools into the pipeline.
Senior Backend Engineer
Fidelity Bank Plc
May 2022 - May 2024 (2 years)
Developed backend services for banking and payment workflows. Contributed to migration from ASP.NET Framework to ASP.NET Core and built a bulk payment engine for high-volume transactions. Built RabbitMQ messaging with retries and dead-letter queues, migrated over 2 million records into SQL Server, introduced test-driven development, and optimized SQL for reconciliation and reporting.
Senior Backend Engineer
Fidelity Bank Plc
May 2022 - May 2024 (2 years)
Contributed to migration of core banking APIs to ASP.NET Core and designed a bulk payment engine integrated with national payment infrastructure. Built RabbitMQ-based messaging services and executed ETL migration of over 2 million records.
Full-Stack Software Engineer
LIBMOT
Sep 2021 - Apr 2022 (7 months)
Owned a transport booking, inventory and logistics platform from development through live transaction processing. Built an e-wallet and bill payment system with ASP.NET Core, database design and web interfaces. Integrated payment gateways with attention to webhooks, idempotency and failed or partial transactions. Optimized SQL queries and introduced a QR-based workflow that improved field data capture.
Full-Stack Software Engineer
LIBMOT
Sep 2021 - Apr 2022 (7 months)
Owned the transport booking, inventory, and logistics platform end to end, including payment integration with African payment gateways. Built an e-wallet and bill payment system from the ground up.
Full-Stack Software Engineer
Genesys Tech Hub
Jan 2020 - Aug 2021 (1 year 7 months)
Built and maintained backend services and a microservices-based HR platform on Azure. Developed worker services, messaging workflows and supporting services for scheduled and event-driven processing. Secured APIs with OAuth 2.0 and bearer tokens, introduced an API gateway, and containerized services with Docker for Kubernetes deployment. Worked with product, design and QA teams in two-week delivery cycles.
Full-Stack Software Engineer
Genesys Tech Hub
Jan 2020 - Aug 2021 (1 year 7 months)
Built and maintained background processing services using .NET Worker Services and deployed a microservices-based HR platform on Azure. Secured APIs with OAuth2.0 and implemented an Ocelot API gateway.
Education
Degrees, certifications, and relevant coursework
Microsoft
Azure DevOps Engineer Expert, DevOps
2021 - 2021
Earned the Azure DevOps Engineer Expert certification in 2021.
Microsoft
Azure Developer Associate, Cloud Development
2021 - 2021
Earned the Azure Developer Associate certification in 2021.
Microsoft
Microsoft Certified Trainer (MCT), Training
2021 - 2021
Earned the Microsoft Certified Trainer (MCT) certification in 2021.
Microsoft
Azure Data Fundamentals (DP-900), Data
2021 - 2021
Earned the Azure Data Fundamentals (DP-900) certification in 2021.
Amazon Web Services
AWS Cloud Practitioner Associate, Cloud
2020 - 2020
Earned the AWS Cloud Practitioner Associate certification in 2020.
Cisco
Introduction to Cybersecurity, Cybersecurity
2020 - 2020
Completed the Introduction to Cybersecurity course in 2020.
University of Nigeria, Nsukka
B.Eng Electronic Engineering, Software Engineering
2014 - 2019
Grade: Second Class Honours (Upper Division)
B.Eng in Electronic Engineering with Second Class Honours (Upper Division), majoring in Software Engineering.
University of Nigeria, Nsukka
Bachelor of Engineering, Electronic Engineering
2014 - 2019
Grade: Second Class Honours (Upper Division)
Major: Software Engineering
Tech stack
Software and tools used professionally
Postman
OpenAPI
Fiddler
Amazon EC2
Microsoft Azure
Amazon S3
GitLab
SonarQube
Veracode
Kubernetes
Azure Pipelines
PostgreSQL
MongoDB
ASP.NET Core
Azure DevOps
Jira
jQuery
JavaScript
HTML5
C#
RabbitMQ
Amazon SQS
Azure Service Bus
MediatR
Ocelot
Grafana
Prometheus
Confluence
GraphQL
gRPC
OpenSSL
Checkmarx
AWS Lambda
Amazon RDS
TypeScript
Git
Docker
AWS Elastic Beanstalk
Paystack
Availability
Location
Authorized to work in
Salary expectations
Skills
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