
Enmanuel Reynoso Chaljub
Verified Expert in Engineering
Systems Engineer and Developer
Punta Cana, La Altagracia Province, Dominican Republic
Toptal member since April 9, 2026
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
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
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.
Lead Web3 Back-end Engineer
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.
Independent Web3 Consultant
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.
Senior Back-end Engineer
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.
Senior Software Developer
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.
Senior Software Engineer
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.
Full-stack Engineer
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.
Experience
High-yield Synthetic Trading Options
https://umoja.gitbook.io/umoja-protocol• 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/• 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/• 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
• 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
Master's Degree in Master in Compliance, Fraud, AML Specialization in Risk Analysis and Stock Market
UCAM - Madrid, Spain
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
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