available for senior roles

Samuel
Jimoh

Senior Software Engineer

I build the infrastructure that sits beneath the surface; payment systems, microservices, distributed queues, automtion modules, and APIs that hold under pressure. Based in Abuja.

5+
Years of experience
12+
Production systems shipped
3
Industries: fintech, e-commerce, SaaS
99%
Uptime SLA maintained across prod services

Core stack
TypeScript Node.js NestJS Go C# PostgreSQL MongoDB Redis RabbitMQ AWS Terraform n8n Zapier

Experience

2023 - Present
Xaaki Digital Hub
Full-time
VP of Products

Led product and engineering strategy for a digital services hub in Abuja. Oversaw backend architecture, team hiring, and delivery of B2B software services across multiple verticals.

  • Defined technical roadmap and owned delivery across 3 client product lines
  • Built and managed a cross-functional engineering team from the ground up
  • Negotiated and closed enterprise service agreements with corporate clients
2022 - Present
Byteflow / Indre Cirkel
Contract
Senior Backend Engineer

Designed and maintained the backend platform for a payments-adjacent SaaS product. Focused on reliability, performance, and correctness of financial data pipelines.

  • Built Monnify payment integration with webhook verification, reconciliation, and retry logic
  • Refactored dashboard analytics service to eliminate N+1 patterns; cut query time by ~70%
  • Designed Prisma/PostgreSQL schema for wallet, ledger, and transaction state management
2021 - Present
Cardgit
Contract
Backend Engineer

Contributed to authentication, identity, and business profile infrastructure for a digital card platform.

  • Implemented personal and enterprise registration flows with verification and OAuth support
  • Hardened JWT authentication layer; resolved expiry and Passport strategy edge cases
2020 - 2022
Earlier Roles
Fintech / Banking
Backend & Payments Engineer

Worked across banking and fintech contexts building payment infrastructure, SMPP-based SMS platforms, and integration layers for Paystack and Stripe.

  • Built SMPP messaging platform handling high-volume transactional SMS
  • Integrated Paystack, Stripe, and Monnify across multiple products
  • Developed Telegram bots with Grammy/TypeScript for automation workflows

Selected Projects

Microservices Architecture
Xaaki Repair Hub

Built the backend architecture for a digital services hub, including microservices for repair requests, service provider management, real time chat, agentic ai module and payment processing.

NestJSMongoDBRabbitMQRedisBullMQDockerAWSTerraform
Banking Service
Haggai Mortgage Bank

Developed and maintained a secure banking API that powers account management, transaction processing, and authentication services. I implemented HMAC-SHA512 request validation, integrated the platform with the bank's core banking system via SOAP APIs, and connected it to NIBSS, delivering a secure and reliable payment infrastructure that supports critical banking operations

TypeScriptPostgreSQLPrismaNode.jsHMAC-SHA512
Identity Service
Digical Business card platform

Developed a full-featured digital business card platform that enables users to share their professional profiles, social media accounts, websites, and services through a single digital card. In addition to contact sharing, I implemented event management and appointment booking capabilities, creating a centralized solution for networking, lead generation, and customer interactions.

TypeScriptExpressPostgreSQLPromise.all
Identity & Auth
Auth Kyc and identity verification System

Developed a KYC verification platform that enables businesses to securely verify customer identities using Nigerian identity data, including phone numbers, NIN, BVN, voter's cards, and driver's licenses. I developed the backend services and integrations that automate identity verification, helping organizations streamline onboarding while meeting KYC and regulatory compliance requirements.

NestJSJWTPassportMongoDBOAuth2
Messaging Infrastructure
SMPP SMS Platform

Designed and developed a production-ready SMS aggregation platform supporting both SMPP and HTTP messaging for enterprise clients. From the backend architecture to message routing and API integrations, I built the platform end-to-end, and it now reliably processes over 2 million SMS monthly via SMPP and 50,000 SMS monthly via HTTP

Node.jsSMPPRedisPostgreSQL
Ecommerce
Decentralized ecommerce platform

I developed core backend services for a social commerce platform that empowers creators and businesses to monetize their audiences through customizable online storefronts. I designed and implemented APIs for user management, product catalogs, order processing, payments, and merchant operations, contributing to a scalable and secure platform that simplifies online selling and fulfillment.

TypeScriptGrammyNode.jsMongoDB

Technical Skills

Languages
TypeScript / Node.js
Go
C# / .NET
SQL
Frameworks & Runtime
NestJS
Express
Prisma / TypeORM
Data & Messaging
PostgreSQL
MongoDB
Redis
RabbitMQ / BullMQ
Cloud & Infra
AWS (EC2, S3, RDS, SQS, Lambda)
Terraform
Docker / GitHub Actions
Paystack / Monnify / Stripe

Contact

Open to senior backend roles, payment infrastructure contracts, and interesting architecture problems.

Let's talk.