Hire with confidence

About me

I’m Dereje Seifu, a senior full-stack engineer with 4+ years shipping production software for founders, startups, and lean product teams. I’m remote by default, timezone-flexible, and used to owning end-to-end delivery: product UI, APIs, AI features, automations, and the cloud pieces that keep them running.

If you’re on this page, you’re already evaluating whether I can move your roadmap without drama. The short answer: I build for outcomes you can measure: ship velocity, fewer integration surprises, and systems that don’t need a rewrite when traffic or scope grows. Below is the stack I use in live products, so you know exactly what you’re buying before we talk.

Production-first delivery

Real users and real uptime. Strong typing, sane boundaries, deployments you can trust on day one, not a demo folder that crumbles.

One senior owner for the messy middle

I stay across frontend, backends, integrations, AI, and cloud so you aren’t corralling overlapping vendors before launch.

Straightforward cadence

You get pragmatic scope, written decisions when it matters, and demos you can show stakeholders without spin.

Stack & capabilities

Tools I’ve shipped in production

Grouped for clarity, ordered roughly by how central each area is to engagements. Every tag reflects work shipped or operated for clients, not resume decoration.

Software architecture & system design

How the product is structured before build and how it survives growth

Software architectureSystem designSaaS architectureRAG system designDatabase schema designScale & capacity planning

JavaScript & TypeScript stacks

Core web and API delivery

TypeScriptNext.jsReactNode.jsNestJSExpressMERNPERN

AI integration & retrieval

Shipping AI features in production, not slide decks

AI integrationRAGLangChainVector databasesMLOps

Python & APIs

Fast services and ML-adjacent backends

PythonFastAPI

Cloud, DevOps & data

Where it runs and how it is operated

AWS (Lambda, serverless)SupabaseDevOps

Performance (backend)

Throughput and stability under real traffic

API latency & throughputQuery & index tuningCaching layers (Redis, HTTP)Async jobs & queuesRate limits & graceful scaling

Performance (frontend)

Perceived speed and layout stability

Core Web VitalsLCP & CLS tuningCode splitting & lazy loadingImage & asset optimizationCaching & CDN-friendly builds

SEO & search visibility

Classic search, structured data, and visibility in AI-assisted search and overviews

SEOTechnical SEOAI SEOMetadata & Open GraphStructured data (JSON-LD)Sitemaps & indexing

Voice & telephony

Realtime and telephony-backed products

VapiRetellTwilio

Workflow automation

N8N

Tools & integrations

Connecting the product to how your team already works

SlackWhatsAppTelegramNotionAirtableGoHighLevel (GHL)

Don’t see a niche tool listed? I’ve stitched plenty of bespoke APIs and internal systems together. If it has docs or webhooks, we can plan it.

Let's work together

Short intro first, availability, timeline, stack fit, then Calendly, email, or Liya anytime.

Derejeseifu3030@gmail.com

Phone

(+251) 0966016473

drjseifu1991

@derejeseifu

Upwork

Dereje Seifu

Typical response within 1 hour · Remote · Global time zones