Enmanuel Reynoso Chaljub, Developer in Punta Cana, La Altagracia Province, Dominican Republic
Enmanuel is available for hire
Hire Enmanuel

Enmanuel Reynoso Chaljub

Systems Engineer and Developer

Punta Cana, La Altagracia Province, Dominican Republic

Toptal member since April 9, 2026

Bio

Enmanuel is a 12+ year back-end and systems engineer specializing in high-performance cloud architectures, low-latency data pipelines, and deep database tuning. He brings strong domain expertise across Web3, decentralized finance, trading, and payments, and excels at designing reliable, scalable systems. Enmanuel's recent work includes smart contract audits, payment processing, and the design of insurance systems in accordance with HIPAA, SOC 2, and ISO 27001 standards.

Portfolio

Seeko AI
Agentic AI, Artificial Intelligence (AI), AI Chatbots, Kubernetes, DigitalOcean...
Moon Technologies
Amazon Web Services (AWS), TypeScript, Redis, Go, Pulumi, PostgreSQL, MySQL...
Freelance Clients
Python, Node.js, Amazon Web Services (AWS), Azure, TypeScript, Go, PostgreSQL...

Experience

  • PostgreSQL - 10 years
  • Amazon Web Services (AWS) - 10 years
  • Node.js - 10 years
  • TypeScript - 9 years
  • Redis - 8 years
  • Python - 6 years
  • Docker - 6 years
  • Go - 2 years

Preferred Environment

Node.js, Python, Go, Amazon Web Services (AWS), Redis, RabbitMQ, PostgreSQL, Docker, TypeScript, Solidity

The most amazing...

...work I've done is lead a Web3 payment settlement and blockchain indexing overhaul, improving latency and enterprise-grade custody.

Work Experience

Senior Software Engineering Consultant

2026 - 2026
Seeko AI
  • Architected the cloud and runtime foundation across DOKS, Pulumi, Cilium, SigNoz, and S3 CSI, as well as managed MongoDB, public load balancers, TLS, DNS, and GitHub Actions deployment automation, ensuring strong local and cloud parity with Kind and Tilt.
  • Designed and delivered a tenant-scoped knowledge layer that ingests operational documents, builds agent-readable context, and exposes structured workflows through MCP and HTTP APIs.
  • Integrated third-party source connectivity, access controls, scoped credentials, tool execution, and activity auditing to support secure agent workflows across internal business systems while aligning with HIPAA, ISO 27001, and SOC 2 Type 2 requirements.
Technologies: Agentic AI, Artificial Intelligence (AI), AI Chatbots, Kubernetes, DigitalOcean, Cilium, Container Storage Interface (CSI), Model Context Protocol (MCP), RAG Systems, RAG Pipelines, Prompt Engineering, Agentic RAG Systems, Data Pipelines, Data Lakes, Vanta

Lead Web3 Back-end Engineer

2025 - 2026
Moon Technologies
  • Cut test execution time by 75% by redesigning the entire Node.js and TypeScript test harness. Fixed stale tests, restored full coverage across 500+ cases, and reduced suite runtime from 30 minutes to just over 7 minutes.
  • Led a major overhaul in the payments system end-to-end, eliminating downtime, reducing acknowledgment latency to 1 minute, trimming unnecessary 3rd-party dependencies, and separating detection, processing, KYT, and wallet/balance subsystems.
  • Delivered a robust multi-chain Web3 pipeline, including a from-scratch EVM/Solana/Tron indexer, secure on-ramp refactors, and high-performance Go-based Lambda services. Enhanced reliability, security, and throughput of blockchain-driven flows.
Technologies: Amazon Web Services (AWS), TypeScript, Redis, Go, Pulumi, PostgreSQL, MySQL, RabbitMQ, Crypto, Back-end Architecture, JavaScript, Back-end, REST APIs

Independent Web3 Consultant

2025 - 2026
Freelance Clients
  • Reviewed and integrated Uniswap V3 soft forks in multiple EVM-chains.
  • Integrated Binance, Deribit, PancakeSwap V3, and Chainlink VRF for trading strategies and staker’s rewards.
  • Ensured trails and audit systems were in compliance with SOC 2, ISO 27001, and HIPAA standards.
Technologies: Python, Node.js, Amazon Web Services (AWS), Azure, TypeScript, Go, PostgreSQL, Redis, Docker, Solidity, Solidity Assembly, RabbitMQ, Crypto, Back-end Architecture, JavaScript, Full-stack, Back-end, HIPAA, Artificial Intelligence (AI), Agentic AI, AI Chatbots, REST APIs, n8n, Compliance, IT Audits

Senior Back-end Engineer

2021 - 2025
Umoja
  • Led smart contracts (EVM) integrations and DevOps with AWS and GitHub Actions.
  • Coded arbitrage strategies powered by AAVE, Pendle, Ethena, Uniswap V3, and Deribit PERPs.
  • Integrated Cobo, Cooper.co, providing institutional-grade digital asset custody.
  • Developed a multi-language, omnichannel, state-machine text chat for NGO payments and deposits.
  • Specialized query and storage tuning for multiple PostgreSQL databases.
Technologies: Node.js, Python, TypeScript, JavaScript, Django, PostgreSQL, Redis, Crypto, Microservices, Back-end Architecture, Back-end, Twilio API, Chatbots, REST APIs

Senior Software Developer

2021 - 2022
Oagenius
  • Led the migration of core eCommerce-driven services from FaunaDB to a more reliable, cost-efficient AWS Aurora (Postgres), reducing operational overhead and improving latency under heavy read/write load, increasing average query performance by 45%.
  • Enhanced API reliability and throughput for order ingestion, listings sync, inventory updates, and marketplace integrations.
  • Improved cloud infrastructure cost by right-sizing services, optimizing resource allocation, and reducing AWS Lambda runtime.
Technologies: TypeScript, Node.js, AWS Cloud Development Kit (CDK), AWS Lambda, Amazon S3 (AWS S3), PostgreSQL, Back-end Architecture, JavaScript, Back-end, Elasticsearch, Express.js, Twilio API, REST APIs, Event-driven Architecture, eCommerce

Senior Software Engineer

2021 - 2021
Banco BHD Leon
  • Refactored and stabilized critical loan-processing services, including interest calculations, amortization schedules, eligibility checks, and risk scoring.
  • Optimized database performance by rewriting complex SQL, introduced proper indexing strategies, reduced I/O hotspots, and improved transactional consistency under load, getting rid of most sequential scans, repetitive joins, and high-lock wait times.
  • Migrated legacy components toward a more modern .NET stack, streamlining the new codebase to be minimal and extensible.
Technologies: Azure, C#.NET, Microservices, Back-end Architecture, C#, .NET, JavaScript, Back-end, Express.js, Full-stack Development, REST APIs

Full-stack Engineer

2017 - 2021
Arpictech
  • Integrated real-time video, voice, and text streaming (WebRTC/WebSockets) into enterprise ERP systems to expand customer communication capabilities.
  • Delivered end-to-end solutions as a full-stack developer and DBA, building and customizing SaaS platforms for major Dominican and US brands.
  • Enhanced analytics workflows by incorporating Power BI, Tableau, DuckDB, Trino, and AWS Athena, enabling richer reporting and faster insight generation.
  • Designed and maintained large-scale ETL pipelines, processing high-volume datasets with strict reliability and consistency requirements.
  • Resolved critical data issues by fixing data leaks, correcting corruption patterns, and eliminating performance bottlenecks across multiple production and staging environments.
Technologies: TypeScript, Node.js, React, Docker, SAP, Odoo, NGINX, PostgreSQL, SQL Server DBA, MySQL, JavaScript, MongoDB, Amazon Web Services (AWS), Microservices, Back-end Architecture, C#, .NET, Full-stack, Back-end, Elasticsearch, Express.js, HIPAA, Twilio API, Full-stack Development, REST APIs

Experience

High-yield Synthetic Trading Options

https://umoja.gitbook.io/umoja-protocol
• Designed and maintained low-latency services that priced, evaluated, and settled synthetic yield options backed by Web3 liquidity sources.
• Integrated multi-chain data through indexed, real-time feeds to maintain accurate collateral, yield curves, and synthetic payoff calculations.
• Built and optimized transaction pipelines handling minting, exercising, rolling, and settlement of synthetic options using smart contracts and custom back-end logic.
• Led infrastructure improvements enabling deterministic execution, reproducible pricing operations, and fault-tolerant settlement flows.
• Performed smart-contract reviews of staking, yield-generation, and payoff modules involved in the synthetic options lifecycle.

Bank's Lending System Overhaul

https://bhd.com.do/
• Refactored and stabilized critical loan-processing services, including interest calculations, amortization schedules, eligibility checks, and risk scoring.
• Optimized database performance by rewriting complex SQL, introduced proper indexing strategies, reduced I/O hotspots, and improved transactional consistency under load, getting rid of most sequential scans, repetitive joins, and high-lock wait times.
• Migrated legacy components toward a more modern .NET stack, streamlining the new codebase to be minimal and extensible.

Web3 Realtime PvP Gaming

https://daemons.app/
• Improved system observability by integrating structured logging, real-time metrics to expose latency bottlenecks, combat-flow anomalies, and blockchain sync issues.
• Rewrote and optimized the PvP combat state machine, enhancing turn resolution, effects/status application, and score generation.
• Conducted comprehensive audits across back-end services, verifying event-processing correctness, security boundaries, and performance under load.
• Audited front-end gameplay flows to eliminate client-side inconsistencies and improve wallet-interaction reliability.
• Reviewed and validated $DMN staking and airdrop smart contracts.

AI-enhanced Claims Processing System

• Designed and delivered an enterprise-grade insurance claims platform with strict compliance alignment (SOC 2, ISO 27001, HIPAA-related safeguards).
• Implemented full end-to-end auditability with immutable event trails, enabling regulators and auditors
• Engineered secure workflow automation for intake, adjudication, approvals, and settlements, embedding regulatory rules directly into system logic.
• Crafted a document-processing pipeline that performed OCR (data extraction), AI-based document classification, and initial claim decisioning, later reviewed and approved by human adjusters.

Education

2026 - 2026

Master's Degree in Master in Compliance, Fraud, AML Specialization in Risk Analysis and Stock Market

UCAM - Madrid, Spain

2016 - 2018

Bachelor's Degree in Software Engineering

Las Americas Institute of Technology - Dominican Republic

Skills

Libraries/APIs

Node.js, REST APIs, React, Twilio API, Stripe

Tools

RabbitMQ, GitHub, n8n, Terraform, AWS Cloud Development Kit (CDK), Odoo, NGINX

Languages

TypeScript, Lua, JavaScript, Python, Go, Solidity, C++, C#, C#.NET, Solidity Assembly

Frameworks

Express.js, .NET, Django

Paradigms

Microservices, Back-end Architecture, Event-driven Architecture, Model Context Protocol (MCP)

Platforms

Amazon Web Services (AWS), Docker, Kubernetes, Vanta, Azure, AWS Lambda, DigitalOcean, Cilium

Storage

Redis, PostgreSQL, Data Pipelines, Data Lakes, SQL Server DBA, MongoDB, Amazon S3 (AWS S3), MySQL, Elasticsearch

Other

Crypto, Full-stack, Back-end, Full-stack Development, eCommerce, Prompt Engineering, Artificial Intelligence (AI), Chatbots, Compliance, IT Audits, Agentic RAG Systems, Pulumi, GitHub Actions, Software, IT Projects, SAP, HIPAA, Agentic AI, AI Chatbots, Container Storage Interface (CSI), RAG Systems, RAG Pipelines, Risk Management, Financial Risk Analysis, Stock Market

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring