Tech background

Jeffrey Sánchez

Fullstack Software Engineer with special interest in Machine Learning, Golang, and Distributed Systems.

12+Years of experience
10+Companies worked with
8+Languages & stacks

About

Over the course of 12 years, I have developed systems that operate well when they are working and have problems when they don't, with scalable architecture and automated processes giving people back their time. My primary programming languages are C#, TypeScript, Golang and Python, but writing code that is working for this moment is not my sole craft.

I don't think of deployment methods as an afterthought, but as part of my thought process. Both Docker and Kubernetes can accomplish the goals of "quickly" and "with certainty." Any system that relies on one person's capability to maintain it is a risk.

I will support my coworkers and invest time in developing them through mentoring and justifying my decision-making. I am most successful working through difficult problems with significant ramifications, alongside other serious-minded people.

Based in Santo Domingo, DO
Experience 12+ years
Languages C#, TypeScript
Golang, Python
Infra Docker · AWS · K8s
CI/CD · Bash
Interests ML · Distributed Systems
Open Source · Chess
Spoken Spanish (native)
Portuguese (conversational)

Experience

Software Go Engineer  🔥👨🏻‍💻 Bitget · Remote · Contract 2025 – Present
  • Optimized core RPC services handling 2.9M peak QPS, achieving 50% compute resource savings and 30% latency reduction, conducted thorough staging/production testing and traffic diversion.
  • Improved system throughput by ~35% by refactoring synchronous blocking calls into concurrent goroutine pipelines.
  • Enhanced on call efficiency for Wallet services by developing AI driven analysers and auto conclusion features in the Oncall Agent, used Golang, LLMs, and vector databases to rank relevant events, correlate error logs with code locations, and suggest root causes, reducing engineers' on call burden.
GolangMySQLRedisRabbitMQDockergRPCAWSGit
Senior Software Engineer Arajet · Santo Domingo, DO · Hybrid Feb 2025 – May 2025
  • Boosted data processing 3× with Python pipelines, mentored 6+ developers in best practices.
  • Standardized development framework and architecture, contributing to the core of new.arajet.com.
PythonC#ReactRPAAKSDockerAzure DevopsGit
Senior Software Engineer – (AI Consultant) GNS · Cali, Colombia · Remote · Contract Sep 2024 – Nov 2024
  • Designed full observability stack with Grafana, Loki and Prometheus, active Pipecat open source contributor.
  • Architected AI agent orchestration services using Python and FastAPI, integrating LLMs for intent detection.
PythonFastAPIGenesys CloudGrafanaLokiPrometheusPipecatBitBucketDockerGit
Senior Software Engineer Crecer Lab · Santo Domingo, DO · Hybrid Mar 2024 – Jul 2024
  • Led backend architecture design for core product features focused on performance and scalability.
  • Mentored junior developers, established code review standards and CI/CD workflows.
PythonReactDockerJenkinsSQLGitHubGit
Senior Software Engineer Antillean Software (AS) · Santo Domingo, DO · Hybrid May 2023 – Feb 2024
  • Led migration from legacy monoliths to microservices using FastAPI/Alembic, spearheaded AWS deployments.
  • Managed PostgreSQL migrations and centralised log management with MongoDB.
  • Enhanced UI design and performance across web applications.
  • Spearheaded microservice architecture design and provided mentorship to fellow developers.
PythonFastAPIDjangoFlaskStrawberryMongoDBPostgreSQLAlembicHasuraDockerKubernetesAWSGit
Senior Software Engineer EDFI Alliance · Austin, TX · Remote May 2022 – Mar 2023
  • Led development of the API to AMT Data Lake an open source ETL pipeline that extracts all Ed Fi ODS API data into JSON and Parquet, shaped to match the Analytics Middle Tier for Power BI consumption.
  • Orchestrated parallel data ingestion with Dagster, leveraging configurable multi CPU processing for high throughput API pagination.
  • Implemented descriptor mapping engine to normalise Ed Fi ODS enumeration variability across installations, enabling consistent AMT view filtering.
PythonC#DagsterGitHubPostgreSQLPL/SQLPower BIDockerCI/CDBashJupyterGit
Software Engineer → Senior UI Software Engineer ↑ promoted CBORD · Ithaca, NY · Remote · via Quantum Dec 2019 – Mar 2022
  • Drove Angular version migration, refactoring legacy components and reducing UI bundle size.
  • Enhanced mobile application UX with Ionic and RxJS, built comprehensive test suites.
  • Fixed discrepancies and created tests to validate behaviour of functions and components.
  • Migrated jQuery and Bootstrap to stable modern versions for use in new products.
  • Contributed to multiple .NET products, writing clean C# across MVC layers.
  • Implemented XSS and CSRF security hardening, closing critical vulnerabilities.
  • Optimised stored procedures and backend calls, eliminating obsolete methods.
AngularIonicRxJSSassTypeScriptC#.NET 4.5+MVCSQL ServerAWSBitBucketjQueryGit
Software Engineer ABI Document Support Services · Phoenix, AZ · Remote · via NewTech Aug 2017 – Oct 2019
  • Developed enterprise applications using C#, .NET MVC, and Angular.
  • Coordinated end to end delivery across design, development, testing, and deployment.
  • Wrote clean, well tested code with efficient debugging, ensuring timely project delivery.
AngularC#.NET MVCSQL ServerReactive ProgrammingAzure DevopsGit
Full Stack Engineer MEDS Gravitas · Santo Domingo, DO Jan 2017 – Jun 2017
  • Led POS integration with Odoo, built GraphQL APIs and real time features.
PythonNode.jsReactGraphQLRedisMongoDBPostgreSQLPytestGitHubGit
Software Engineer Citibank · Santo Domingo, DO · On-site Feb 2015 – Nov 2016
  • Rewrote 30+ stored procedures, functions, and jobs cutting transaction time ~45%, migrated apps to async/await.
  • Automated processes from application layer to server, significantly improving data indexing performance.
  • Drove team adoption of modern .NET patterns and async/await across the codebase.
C#WinFormsSQL Serverasync/await.NETAzure DevopsGit
Junior Software Developer Contraloría General de la República Dominicana · On-site Jan 2013 – Dec 2014
  • Built internal government apps in C#/.NET supporting financial control and auditing workflows.
  • Wrote and optimised SQL Server stored procedures for reporting modules.
C#WinFormsSQL Server.NETGit

Education

Bachelor's in Computer Science

Universidad Nacional Pedro Henríquez Ureña (UNPHU)

2011 – 2017

Associate's Degree Software Developer

ITLA · Santo Domingo, DO

2010 – 2014

Skills

LanguagesC#, TypeScript, Golang, Python FrameworksFastAPI, React, React Native, Node.js, .NET MVC AI / MLLLM APIs, Pipecat, Genesys Cloud AI, TensorFlow ObservabilityGrafana, Loki, Prometheus DatabasesPostgreSQL, MongoDB, Redis, SQL Server InfraDocker, AWS, CI/CD, Git, Bash ToolsLinux, Bash scripting, gRPC, REST APIs, WebSockets SpokenSpanish (native) · Portuguese (conversational)

Certifications

gRPC [Golang] Master Class: Build Modern API & Microservices
Udemy · Issued Aug 2025
GolanggRPCMongoDB
Show credential open_in_new
Go Bootcamp: Master Golang with 1000+ Exercises and Projects
Udemy · Issued Feb 2025
Golang
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AWS Certified Machine Learning Specialty 2025 – Hands On!
Udemy · Issued Jan 2025
PythonAWSMachine LearningTensorFlow
Show credential open_in_new
Data Science: Deep Learning and Neural Networks in Python
Udemy · Issued May 2023
PythonTensorFlow
Show credential open_in_new
Machine Learning, Data Science & AI Engineering with Python
Udemy · Issued Jan 2023
TensorFlowPythonGPT
Show credential open_in_new
Introduction to Redis for AI
University.redis.io · Issued Jan 2025
RedisAI
Show credential open_in_new
Next.js 15 & React – The Complete Guide
Udemy · Issued Jun 2022
React.jsTypeScriptNext.js
Show credential open_in_new
React – The Complete Guide 2025 (incl. Next.js, Redux)
Udemy · Issued Apr 2022
React.jsRedux.jsJavaScriptHTML5CSS
Show credential open_in_new
jeffrey@2606:50c0:8002::153 zsh
jegasape@2606:50c0:8002::153:~ $ whoami ▸ ▋

Filter by type:

AllBackendFrontendAITool

Filter by language:

AllGolangPythonC#TypeScriptShell
AIBackendPythonFastAPIPipecat

Real-time Voice AI Agent

AI voice agent pipeline with Pipecat and FastAPI, integrating LLMs for real-time speech-to-intent workflows.

github.com/jegasape
AIPythonOpenCV

Real-time Facial Recognition

Real-time facial recognition and identity authentication using OpenCV.

github.com/jegasape/face-recognition
BackendGolangPostgreSQLDocker

High-performance Go Services

Core backend services for a confidential client ~35% throughput improvement using goroutine pipelines.

github.com/jegasape
ToolC#.NET

Dominican Lottery Results Scraper

Automated extraction and parsing of Dominican lottery results with precise digit-retrieval algorithms.

github.com/jegasape/dominican-lotteries
BackendAIPythonDagsterAWS

ETL Data Lake Pipeline

End-to-end ETL pipeline using Dagster on AWS, surfacing data through Power BI dashboards.

github.com/jegasape
ToolGrafanaLokiPrometheus

Microservices Observability Stack

Production-grade observability Grafana dashboards, Loki log aggregation, Prometheus metrics.

github.com/jegasape
ToolGolangConcurrency

Concurrent Wallpaper Downloader

Fast CLI tool to download images concurrently with fine-grained control.

github.com/jegasape/goget-wallpaper
ToolGolangFinance

Real-time Stock Market Tracker

Real-time S&P 500 and stock exchange tracker with market movements and trends.

github.com/jegasape/spirex
ToolGolangConcurrency

Go Concurrent Progress Bar

High-speed concurrent progress tracking for Golang pipelines inspired by Python's tqdm.

github.com/jegasape/TQDMK
ToolGolangConcurrency

Channel-based Progress Tracker

Concurrent Golang utility for tracking progress across parallel tasks.

github.com/jegasape/TQDMC
ToolGolangSecurity

AES-256 Encryption Library

Clean, reusable Golang library for AES-256 symmetric encryption.

github.com/jegasape/aes256
ToolGolangMemory

Weak Pointer for Golang

Golang library implementing weak pointer semantics useful for caching.

github.com/jegasape/weakpointer
BackendGolangHTTPFork

High-performance Go HTTP Framework

Fork of CloudWeGo's Hertz extensible Go HTTP framework for microservices.

github.com/jegasape/hertz
BackendGolangRPCFork

High-performance Go RPC Framework

Fork of CloudWeGo's Kitex low-latency Go RPC framework.

github.com/jegasape/kitex
BackendGolangWebSocketsFork

1M WebSocket Connections in Golang

Handling 1 million simultaneous WebSocket connections concurrency stress-test.

github.com/jegasape/1m-go-websockets
AIPythonRAGFork

Adaptive RAG Agent Framework

Fork of an adaptive self-directed RAG framework for intelligent agents.

github.com/jegasape/advanced-rag-flow
AIPythonLLMFork

Reasoning LLM via Reinforcement Learning

Fork of DeepSeek-R1 reasoning-focused LLM trained via RL.

github.com/jegasape/DeepSeek-R1
AIPythonLLMFork

Frontier Open-source LLM

Fork of DeepSeek-V3 for local inference experiments.

github.com/jegasape/DeepSeek-V3
FrontendTypeScript

Flying App

TypeScript frontend application currently in active development.

github.com/jegasape/flying-app
ToolShellLinux

Custom Desktop Environment Setup

Personal dotfiles with window manager configs and custom Linux desktop guide.

github.com/jegasape/dotfiles

Backlog

Things I want to do before I die.

1Contribute to an open-source project
2Work in UK or Japan
3Work at a top-tier tech company
4Countdown New Year's Eve at Times Square
5Exit a useful and helpful startup
6Build a useful tool for the education system
7Marry the love of my life (soon...)
8Experience zero gravity
9Work fully remote for an international company
10Drive a Tesla
11Get a patent
12Start a nonprofit organisation
13Sleep outside on the beach under the stars
14Live in another country
15Build my own home
16Build a production AI agent from scratch
17Have a 2000 Elo chess rating
18Visit an island I've never been to
19Jump out of a plane
20Take a hot-air balloon ride
21Publish a paid app or game
22Visit all seven continents (1/7)
23Get promoted at a job
24Eat sushi in Japan
25Fall in love
26Build a custom AI life coach
27Get into competitive programming
28Ship a side project with 1000+ users
29Write a technical blog
30Learn Portuguese fluently
31Mentor someone into their first dev job
32Visit a jungle