Backend systems
FastAPI, NestJS, Gin. Queues, caching, auth, and service boundaries that survive concurrent load — proven on real payment paths.
; program output
Tesfamichael Abebe
software engineer — backend systems · applied AI · compilers
I build backend systems and AI pipelines — and once, to understand the whole machine, my own programming language. Studying software engineering at Addis Ababa University; researching human state recognition at Synheart AI.
- 1
- language built
- 300ms
- payment paths
- 0.93
- retrieval precision
- 5
- teams shipped with
Addis Ababa, Ethiopia · Open to AI, backend & ML engineering positions
; ===== 01 · selected work ==============================
Systems with a visible spine.
Not thumbnails — working surfaces. What each system does, where the complexity lives, and the numbers it answers to.
01 shipped
EPIC++ Compiler
A statically-typed language that compiles to LLVM IR — designed and built from zero.
PythonANTLR4llvmliteLLVM IR
02 shipped
DS AI Assistant
A domain-specific RAG assistant for data science, wired together with MCP.
0.93 retrieval precision4.8/5 answer relevance
PythonChromaDBBM25Sentence Transformers
03 live
Uptime Monitoring Service
A production uptime monitor: async health checks, alerts, and a real deployment.
FastAPIPostgreSQLRedisDocker
04 live
Chapa Events & Donations
Live ticketing and donations platforms for Ethiopia’s payment gateway.
300ms concurrent payment response2 products in production
Next.jsTypeScriptTailwind CSSGoPostgreSQL
; ===== 02 · operating range ============================
Define constraints. Build the machinery.
Applied AI / ML
RAG pipelines, agent orchestration with LangChain and LangGraph, PyTorch models, and human-state research at Synheart AI.
Compilers & languages
Lexing, parsing, type systems, LLVM IR. I designed and built EPIC++ — a statically-typed language with its own compiler.
Product engineering
React, Next.js, Svelte, Flutter, React Native. Interfaces shipped to production for fintech, education, and families.
; ===== 03 · runtime history ============================
Call stack.
Five organizations in two years — payments, AI research, open source, HR platforms. Most recent frame on top.
; ===== 05 · field notes ================================
Written while the solder cooled.
Engineering notes from real builds — compilers, payments, retrieval pipelines.
Jul 13, 2026 · 3 min
Synheart log — week one on the kinematics team
First entry in a running log from the Synheart AI research team — what human state recognition actually involves, and what my first week looked like.
read note Jun 2, 2026 · 8 minHybrid retrieval beat my vector database, and it wasn't close
Building a data-science assistant taught me that pure semantic search quietly fails on the queries experts actually ask — and that BM25, a 30-year-old algorithm, fixes it.
read note Jan 15, 2026 · 9 minBuilding EPIC++, a language that compiles to LLVM IR
What actually happens between a .epp source file and machine code — two-pass compilation, lvalues vs rvalues, and the day the structs finally worked.
read note; ===== eof · linkage ===================================
Have a system worth building?
Open to AI, backend & ML engineering positions. The fastest channel is email — I read everything.