Available for new projects

Yohannes Kindu Mekonnen

A Backend Web Developer

NestJS · PostgreSQL · ASP.NET Core

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Yohannes Kindu Mekonnen

§ 01Get to know me

About Me

A driven software developer who takes ownership of his work and thrives in fast-moving environments. I'm a team player who's always up for a challenge and eager to learn. I bring a collaborative mindset and enjoy solving problems alongside others, and I aim to build clean, reliable solutions while contributing to a positive team culture.

Currently: Freelancer @ Upwork

Addis Ababa, Ethiopia · yohannes.kindu@gmail.com

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§ 02How I Work

Engagement Process

From first call to production handoff.

01

Discovery

Scope the problem, map data flows, and agree on API contracts before writing code — so the build matches how the system will actually be used.

02

Architecture & Data Modeling

Design the schema and service boundaries with PostgreSQL, MySQL, or MS SQL, and TypeORM/EF Core migrations — built to hold up under real transaction volume.

03

Build & Test

Implement with NestJS, ASP.NET Core, or Express, backed by Jest and NUnit test suites and structured error handling — not spot-checks.

04

Deploy & Handoff

Ship to production with Docker, Redis, and BullMQ/RabbitMQ where the workload needs it, plus documentation so your team can maintain it without me.

§ 03Selected Work

Projects

Backend APIs and full-stack projects across ERP, healthcare, trading, and more.

§ 04What I Offer

Expertise

Backend and full-stack capability, grounded in the languages, frameworks, and tools I actually ship with.

01

Backend & API Development

RESTful APIs and server-side systems with Node.js, NestJS, and ASP.NET Core — from design to production.

Node.jsNestJSExpress.jsC#ASP.NET Core Web APIREST APICodeIgniter
02

Database Design & ORM

Schema design, migrations, and data access with PostgreSQL, MySQL, SQL Server, TypeORM, and Entity Framework Core.

PostgreSQLMySQLMS SQL ServerMongoDBTypeORMEntity Framework CoreMongoose
03

System Integration

Integrating backend APIs with web and mobile clients, third-party services, and existing systems.

JavaScriptTypeScriptBootstrapjQuery
04

Scalable Architecture

Structured, maintainable backends — including microservices and message queues (BullMQ, RabbitMQ) where needed.

DockerRedisBullMQRabbitMQ
05

API Documentation & Testing

Clear API contracts, documentation, and automated tests (Jest, NUnit) for reliable delivery.

JestNUnit
06

Full-Stack Support

Backend APIs paired with front-end integration — .NET MVC, jQuery, Bootstrap — for end-to-end delivery.

Agile

§ 05My Journey

Resume

Work experience and education.

March 2026 – Present

● current

Freelancer

UpworkRemote
  • Delivering backend API and full-stack solutions for clients on Upwork, from scoping through deployment.
  • Building scalable NestJS and Node.js services with PostgreSQL, TypeORM, and clear API contracts.
  • Collaborating with remote teams to ship reliable features on agreed timelines and iterate based on feedback.

October 2024 – March 2026

Backend Engineer

Adroit Technology SolutionsCalifornia, US (Remote)
  • Owned 5+ backend subsystems end-to-end over 2 years across a platform serving 10+ broker-dealer clients: offering versioning, investor portal theming, bulk data export, page asset caching, and the notification pipeline.
  • Took full backend ownership of assigned domains from schema design through deployment, contributing to a platform handling real-time financial transactions and investor management at scale.

May 2024 – August 2024

Backend API Developer

AladiaTorino, Italy (Remote)
  • Designed and implemented backend microservices in a NestJS architecture for a scalable e-learning platform, owning service boundaries, API contracts, and data models.
  • Built LLM-powered features for personalized course recommendations and dynamic content generation, integrating language model workflows into the content delivery pipeline.

September 2023 – March 2024

Full-Stack Web Developer

LucyhubUSA (Remote)
  • Led migration of a hospital management system to .NET 7 with zero downtime, modernizing the application stack and resolving performance bottlenecks across critical healthcare workflows.
  • Identified and resolved multiple critical backend reliability issues across patient management and scheduling modules, significantly improving system stability for production healthcare operations.

January 2023 – September 2023

Backend Web Developer

Chainlinx TechnologiesAddis Ababa
  • Built scalable REST APIs for an ERP platform supporting SME operations, handling concurrent multi-client workflows across HR, attendance, and project management modules.
  • Engineered a geolocation-based attendance system with GPS radius validation, preventing fraudulent check-ins and enforcing physical presence constraints.
  • Delivered full regional localization: Ethiopian calendar, local public holiday management, and timezone-aware scheduling — enabling the platform to serve both local and international users correctly.

October 2022 – November 2022

Backend Developer (Intern)

Orange Digital CenterAddis Ababa
  • Built ERP backend services for micro and small businesses, including accounting modules covering transaction processing, general ledger management, and financial reporting.

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§ 06Get in Touch

Contact Me

Available for backend, full-stack, and API projects — let's build something great.