Emmanuel Nkrumah-Sarpong

Full Stack Software Engineer, 8 yoe.

Accra, Ghana, GMT

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About

Full-stack software engineer with 8 years in modern web development (Typescript, PHP, Python) and cloud platforms (AWS, Google Cloud). Currently building cross-border fintech infrastructure. Managed systems processing $1.19B+ in transactions and served 120,000+ users. Strong track record driving high-impact projects across Ghana, US, and UK startups. Passionate about using technology to solve meaningful problems in finance.

Skills

Languages:

TypeScript, Php, Python

Frontend:

React, Next.js, Tailwind CSS

Backend:

Node.js, Express.js, FastAPI, Laravel, Temporal

Databases:

MySQL, PostgreSQL, MongoDB, Redis

Cloud & DevOps:

AWS, GCP, Digital Ocean, Docker, Github Actions, GitOps

Work Experience

Capi Money (YC23)
Remote

2025 - Present

Software Engineer

Cross-border B2B payments platform serving African businesses. Processed ~$1.19B in GTV at a 1.0–1.1% take rate; grew quarterly revenue from $1.51M to $3.13M. Sole or lead IC across payment rails, compliance, statements, and FX.
  • Built and shipped stablecoin payments end-to-end: USDC and USDT as supported currencies across customer app, API, and Ops. Designed a dynamic-beneficiary model routing through SWIFT, Stablecoin, or Alipay via a single architecture.
  • Delivered the Account Statements platform: PDF statement generation, monthly retrieval endpoints, Ops-facing UI, and 10+ bank ingestions (OmniBSIC, First Atlantic Bank Ghana, Maviance/ORIS Cameroon).
  • Built a deposit compliance pipeline as a Temporal workflow screening every deposit through Flagright, shipping beneficiary verification provider-agnostically.
  • Enabled the Ghana market end-to-end: stood up GHS as a platform currency, integrated 3+ partner bank statement ingestions, and enabled Ghana, Kenya, and G10 currencies as senders/recipients.
  • Authored the fx_conversions data model with reserve/release semantics, and built ledger module scaffold and Fragment ledger query for the rewards pipeline.
  • 235 merged PRs, 171 peer reviews across 14 engineers, and 95 ticketed deliverables across 15 product projects.

Focaldata
Remote

2024 - 2024

Software Engineer, Core Stability and Growth Team

Identified and resolved critical survey issues, providing problem-free customer experiences, resulting in increased revenue retention.
  • Improved observability by overhauling logging in two core Scala services, resulting in richer log data in Datadog and reducing developer time spent on issue resolution by 30% to 50%.
  • Played a key role in swiftly migrating our non-technical in-house researchers from API/CLI tools to a more intuitive, user friendly Retool web interface, backed by a lightweight Python service. This transition boosted usability, productivity, and satisfaction, leading to a 60% reduction in tool complaints within one month.
  • Enhanced proactive survey launch monitoring to detect failures early, providing actionable customer feedback, significantly reducing the occurrence of previously unobservable issues

Zeepay
On-site

2023 - 2024

Senior Technology Manager (Band 1)

Working at Ghana's top company (2022), maintaining and extending critical platforms processing over US$ 93 million in daily transactions.
  • Upgraded Zeepay Ghana's core services from Laravel 6/7 to 10, enhancing security, performance and stability
  • Accelerated Zeepay deployments by hours per release using a custom CI/CD pipeline with GitHub Actions and Jenkins.
  • Introduced Sentry for error logging and Docker for containerization, enhancing dev efficiency, code quality, and observability.
  • Led a peer training program to upskill a cross-functional team of developers, security, IT, and infrastructure professionals, enhancing overall team technical knowledge and productivity.

Plato Solutions Inc
Remote

2021 - 2023

Software Engineer

Developed and architected full-stack software solutions, adhering to rigorous coding standards, testing methodologies, and Agile principles, while demonstrating expertise in REST APIs, GraphQL, Yii framework customization, and CI/CD usage.
  • Architected and implemented real-time ETL that streamlined live product data and media updates in Magento via REST and GraphQL APIs.
  • Published open-source Node.js libraries (Scheduler Engine, HTML Denormalizer) and a composer library (Yii2 GraphQL), each with 2000+ installs.
  • Developed full stack PHP (Yii framework) software that exposes a GraphQL API, using composer library above, that managed automation data for thousands of intricate processes.
  • Facilitated AI efforts through RESTful APIs that provided data for a Machine Learning system, integrating with JIRA, Gitlab and PipeDrive.
  • Delivered a Chrome extension for internal use to aid in automated collection of data into Pipedrive, saving worker time.

Dext Technology
Hybrid

2018 - 2021

Lead Developer

Served as a sole and (later) lead developer of this startup, interfacing between the engineers and the business executives, onboarding other engineers and managing all interns
  • Created an Augmented Reality app for students to make science education interactive. (Award: Winner, Kumasi Hive & British Commission CARE Hackathon, 2018)
  • Crafted cross-platform content-rich eTextbook app, enhancing product value for wider audience.
  • Wrote backend for software gathering comprehensive STEM data (120,000+ students) for Ghana Education Service and National Teachers' Council
  • Set up cloud infrastructure on AWS, self-hosting our store and tools for less than $25/month total
  • Developed a wordpress/woocommerce store which generated US$100,000+ in sales over time
  • Spearheaded innovative touch interactive smart board development (camera, Computer Vision) with interactive lessons - engaging novel product, potential revenue.

Glivion Technologies
Part-time

2014 - 2015

Junior Android Developer

Tested products and implemented features and bugfixes, updated dependencies.
  • Demonstrated expertise in developing, debugging, and testing Android apps like TimeTab. We successfully scaled the app to over 5,000 users, but encountered a challenge when the keystore was lost. We reached 1,000 users again before ceasing development to pursue new projects.

Education

University of Mines and Technology, Tarkwa, Ghana

2013 - 2017
Bachelor's Degree in Computer Science and Engineering

Projects

gh-parliament-ai

AI RAG that teaches you what is going on in Ghana's parliament

Python
TypeScript
React
Artificial Intelligence
AWS EC2
MongoDB
Pinecone vector database

Autocedi

Bank of Ghana Hackathon Finalist. A user friendly platform to automate payments using Ghana's CBDC: The eCedi.

CryptoCurrency
JavaScript
Next.js
Vite
REST
cron

Science Set Shop

eCommerce store for Dext Technology for selling Science Sets. > US$100k sales

eCommerce
WooCommerce
Wordpress
Javascript
Php
Paystack

Scheduler Engine

A library that allows you to set tasks and their schedules then executes tasks at specified times/intervals.

Library
TypeScript
NodeJs

Yii2 Graphql

Fork: graphql server side for yii2 php framework

Library
Graphql
Yii2
Php

HTML Denormalizer

Transforms JSON to HTML

Library
Javascript
Nodejs

Clever Bell

A battery powered smart alarm system with a simple UI and School Management System integrability

IoT
Raspberry Pi
Python
Php