Aleksei Tcelishchev

Senior DevOps and Software Engineer

Playa del Carmen, Quintana Roo, Mexico

Contact

• Website: webomage.com
• LinkedIn: linkedin.com/in/casualuser
• Upwork: upwork.com/freelancers/casualuser
• Contact form: here

Summary

Experienced DevOps & Cloud Engineering Professional specializing in AWS, Kubernetes, blockchain, and AI/ML integrations, with over 20 years of software engineering and DevOps experience. I design robust, scalable cloud infrastructures and innovative solutions across multiple domains including legal, healthcare, and startup ecosystems.

Core strengths include:

• Cloud infrastructure (AWS, Terraform IaC, EC2, VPC, ELB, RDS, IAM, CloudWatch)
• Containerization and orchestration (Kubernetes/EKS, self-hosted clusters, Docker)
• CI/CD pipelines (GitLab, GitHub Actions, Serverless Framework)
• Programming (Python, Node.js, Golang)
• Blockchain & Web3 (Ethereum, smart contracts, DApps)
• Serverless architectures (AWS Lambda, Serverless Framework)
• Monitoring & observability (CloudWatch, Prometheus, Grafana, ELK)

Recently I have been focused on integrating advanced AI technologies (Hugging Face, LangChain, OpenAI and related tools), building sophisticated chatbot and automation frameworks, and ensuring AI safety, ethical standards, and strong performance in production systems.

I am a collaborative team player with strong cross-functional communication skills, proven ability to mentor teams and drive process improvements, and a continuous learner always exploring emerging technologies and best practices.

Key Skills & Expertise

• DevOps & Cloud Infrastructure
  • AWS-focused design and operations
  • Docker-based containerization
  • GitOps workflows and CI/CD pipelines on major git platforms
  • Infrastructure as Code with Terraform and Serverless Framework
• Kubernetes & Orchestration
  • Design and operation of scalable Kubernetes clusters
  • AWS EKS cluster provisioning with Terraform, including:
    • Backup strategies
    • Monitoring and observability
    • Release management and load-balanced deployments
  • TalosOS clusters with Cilium CNI on Proxmox bare-metal, provisioned via Terraform
• AI / LLM Infrastructure & Integrations
  • End-to-end integration of AI tools and LLM-based services into production systems
  • Real-world integrations for YC-backed startups and large US law firms associations
  • Healthcare AI services engineered for HIPAA, SOC 2, PCI, and GDPR compliance readiness
  • Multi-provider LLM routing and evaluation, including SWE-bench–based benchmarking
  • Experience with OpenAI-like LLMs and a2a protocol–based cross-framework integration
  • RAG architectures with optimized data flows and domain-specific processing rules
• AI Frameworks & Tooling
  • langchain.py and langchain.js
  • LangGraph
  • Crew.AI
  • Hatchet
  • Custom cloud and self-hosted AI/LLM solutions
• Backend & API Engineering
  • REST and backend services with:
    • FastAPI
    • Flask
    • Django REST Framework
    • Node.js: Next.js, Nest.js, LoopBack, Express.js, hapi
    • Golang
    • Java / Scala microservices
  • Design of robust, observable APIs for high-traffic and mission-critical systems
• Security & Compliance
  • Architectures designed with HIPAA, SOC 2, PCI, and GDPR compliance readiness
  • Secure handling of sensitive healthcare and legal data

Selected Project Highlights

• YC-backed AI Startup (Hong Kong)
  • Integrated multiple AI tools and LLM services into production infrastructure.
  • Implemented scalable deployments, advanced debugging workflows, and contributed improvements back to the open-source community.
• US Law Firms Association – CRM Automation
  • Built large-scale CRM automation integrating AI-based calls.
  • Implemented emotional context detection in human answers to drive adaptive workflows and client interactions.
• Healthcare AI Services
  • Designed and deployed AI-powered healthcare services with strong focus on:
    • Data protection and privacy
    • HIPAA, SOC 2, PCI, and GDPR compliance readiness
    • Reliable and auditable data-processing pipelines
• AI Evaluation & Routing
  • Implemented advanced AI request routing strategies.
  • Used SWE-bench and related benchmarks to evaluate and tune custom AI solutions across multiple OpenAI-like LLM providers and frameworks.
• RAG & Data Pipelines
  • Architected infrastructure for Retrieval-Augmented Generation (RAG).
  • Built optimized data flows with custom processing rules and domain-specific logic.

Technical Stack

• Languages
  • Python
  • JavaScript / Node.js
  • Go
  • Java
  • Scala
• Key Libraries & Frameworks
  • web3.py
  • boto3 (Python)
  • Equivalent web3- and AWS-related packages in Node.js
  • FastAPI, Flask, Django REST Framework
  • Next.js, Nest.js, LoopBack, Express.js, hapi
  • LangChain (Python & JS), LangGraph, Crew.AI, Hatchet
• Cloud & DevOps
  • AWS (compute, storage, networking, managed services)
  • Docker, Kubernetes (including EKS)
  • TalosOS with Cilium CNI on Proxmox bare-metal
  • Terraform, Serverless Framework
  • GitOps and CI/CD across major git hosting platforms
• Compliance & Operations
  • Architectures aligned with HIPAA, SOC 2, PCI, and GDPR requirements
  • Monitoring, logging, and alerting for production systems
  • Backup and disaster recovery strategies

Languages

• Russian: Native or Bilingual
• English: Full Professional
• Spanish: Limited Working

Certifications

• Microsoft Certified Professional – 70-270 / MCP

Top Skills

• Google Kubernetes Engine (GKE)
• Bitbucket
• Relational Databases

Experience Overview

• Over 20 years of professional software engineering and DevOps experience.
• Extensive work as a hands-on architect and engineer across:
  • Startups (including YC-backed companies)
  • Legal and healthcare organizations
  • High-scale backend and data-processing systems
• Strong focus on cloud infrastructure, automation, monitoring, AI/ML integrations, and blockchain/web3 solutions.

Professional Experience

Independent Software Specialist – webomage.com

Playa del Carmen, Quintana Roo, Mexico · 2006 – Present

• Designed and deployed blockchain infrastructures including Ripple/Stellar verification nodes and Intel/IBM Hyperledger Sawtooth–based networks, with deep understanding of Bitcoin/Ethereum/Forknote infrastructure and smart contract structures, including ICO and sidechain scenarios.
• Hands-on DevOps and backend engineering with strong server-side Node.js experience; maintained and shared code examples, including:
  • https://bitbucket.org/casualuser/hapi
  • https://github.com/casualuser/lets-chat-ansible-playbook
  • https://bitbucket.org/casualuser/node.js-code-samples
• Advanced usage of AWS services and APIs, including asynchronous AWS Lambda executions with different triggers, API Gateway integrations, and spot-instance–based deployments via deployment groups and Auto Scaling rules (sample Lambda: https://gist.github.com/casualuser/418ef0aba71964d250c555df8d6719a9).
• Contributed to the Serverless Framework authentication module (https://github.com/serverless/examples/pull/245).
• Performed deep comparisons of Node.js and web frameworks (Sails.js, StrongLoop, Meteor, Ember, and others), with particular focus on WebRTC-capable stacks.
• Built financial modules integrating Authorize.net and Stripe into Qbix applications, including custom forms and complex UI flows for Stripe API integrations (https://github.com/casualuser/qbix).
• Delivered rich front-end experiences using Angular and mixed JS libraries, including scrollable Bootstrap modals and iframe-based pop-ups.
• Developed mobile and web applications with Ionic/AppGyver and Angular/React/Vue, backed by PHP/Python/Node.js/Serverless/Firebase/Parse and other backends.
• Actively dockerized projects, implemented multi-stage deployments, and set up CI/CD pipelines with continuous delivery of results.

Responsibilities have included:

• Designing and implementing cloud-native architectures.
• Building and operating Kubernetes clusters and serverless systems.
• Developing backend APIs and microservices.
• Integrating and evaluating AI/LLM solutions in real products.
• Leading automation, observability, and reliability initiatives.

Senior DevOps Engineer – BeeTechy LLC

Los Angeles, California, United States · September 2024 – June 2025

• Architected, supported, and enhanced infrastructure for multiple client projects.
• Migrated existing AWS EC2-based deployments to Terraform-managed, Docker-based solutions.
• Optimized AWS costs and provided advanced CI/CD and performance/load support to development teams.

DevOps and Engineering Manager – EventCartel LLC

June 2018 – December 2024

• Led DevOps and engineering efforts on AWS using Terraform for IaC (EC2, VPC, ELB, RDS) integrated with GitLab CI/CD.
• Designed and implemented scalable, secure AWS architectures and automated deployments, optimizing resource usage and costs.
• Architected and operated containerized applications on Kubernetes (including EKS and Proxmox-based clusters), managing Deployments, Services, ConfigMaps, Ingress, and NetworkPolicies.
• Integrated Kubernetes workloads with AWS services (ELB, ECR, CloudWatch) and GitLab-based CI/CD for end-to-end delivery.
• Implemented authentication and security controls with IAM, Cloudflare, WAF, and supported compliance, audits, and penetration testing.
• Built and maintained web applications and APIs using Python, Flask, DRF, and websockets, with full observability (CloudWatch, CloudTrail, X-Ray, Prometheus, Grafana, ELK).

DevOps & AI LLM Services Developer – Agentsmith

July 2023 – February 2024

• Integrated a stack of advanced AI technologies including Hugging Face, Oogabooga, LangChain, Flowise, OpenAI, Anthropic, and a merchant-focused AI assistant.
• Designed and implemented workflows for multi-model NLP processing, fine-tuning domain-specific models and orchestrating data flow between components.
• Containerized the system with Docker and implemented CI/CD pipelines for reliable deployments.
• Developed and executed testing and rollout strategies, including staged deployments, monitoring, and user onboarding.

Senior Backend & DevOps Engineer – DcentraLab

Israel · June 2021 – November 2023

• Used Terraform for IaC on AWS (EC2, VPC, ELB, RDS) with CI/CD integration to design secure, scalable cloud architectures.
• Built and deployed serverless applications on AWS Lambda using Serverless Framework with Python, Node.js, Go, and Scala.
• Architected containerized applications on Kubernetes, managing both EKS and self-hosted clusters, including advanced networking (Ingress, NetworkPolicies).
• Developed blockchain/web3 applications using Python and web3.py, including wallet creation, transaction signing, contract interactions, DApp backends, and The Graph (subgraphs) for indexing and querying.
• Implemented authentication and security with Cognito, IAM, and 2FA, and ensured compliance and audit readiness.
• Built APIs and web applications with Python, Flask, SQLAlchemy, integrating blockchain components and websockets, with full observability (CloudWatch, CloudTrail, X-Ray, Prometheus, Grafana, ELK).

Senior Backend & DevOps Engineer – TokensFarm

Israel and Serbia · June 2021 – November 2023

• Managed DevOps and backend responsibilities for DeFi-related products, leveraging Terraform for AWS IaC and GitLab CI/CD.
• Architected and operated Kubernetes-based workloads (EKS and self-hosted), including advanced features such as Ingress, NetworkPolicies, and HPA, integrated with AWS ELB/ECR/CloudWatch.
• Built blockchain applications using Python (web3.py, eth-abi), including wallet and transaction logic, smart contract integrations, and DApp backends.
• Implemented authentication and authorization with Cognito and Auth0 and ensured DApp security and compliance via audits and penetration testing.
• Developed web apps and APIs (Python, Flask) with websocket integration, deployed via GitHub/GitLab CI/CD.
• Drove collaboration, mentoring, and process improvements across cross-functional teams.

Senior Backend & DevOps Engineer – 2key Network

October 2020 – June 2021

• Maintained and refactored legacy serverless codebases, migrating them to modern Serverless Framework–based stacks.
• Designed and implemented backend services for TokensFarm from project inception, including multiple migrations and architecture iterations.
• Contributed cross-project libraries within DcentraLab and onboarded backend developers across the organization.
• Solved complex web3-related challenges, including provider differences, nonce handling, gas peaks, and integrations with Coingecko, 1inch, DexGuru, and DefiLlama.
• Migrated and hardened storage and infrastructure components, including IPFS and hosted The Graph instances, and hardened RPC nodes.

Associate Product Manager – Froala

Houston County, Texas, United States · June 2019 – April 2020

• Prepared detailed technical documentation for feature releases, used for technical analysis and budgeting by development teams.
• Supported the full release cycle and performed complex integration testing with deep investigation of level 3 bugs.
• Worked across a wide frontend stack (HTML/CSS/JS, React, Angular, Ember, webpack, npm) and multiple backend platforms.

Lead Developer – TalkingCircles

June 2018 – March 2019

• Maintained and extended the existing platform built on AWS, Elastic Beanstalk, Django/DRF, AngularJS, Celery, and Kubernetes.
• Migrated integrated CRM data and events from Intercom to GoSquared.
• Built an internal real-time chat system and participated in migrations from AWS Elastic Beanstalk to GCE with Kubernetes.

DevOps / Backend Developer – Edgy Labs, LLC

December 2017 – May 2018

• Built a serverless backend system on AWS (Lambda, API Gateway, Cognito, Auth0, S3, EC2) to support a desktop application.
• Integrated multiple external APIs, maintained infrastructure resources, and supported the application development team.

Software Engineer / Developer – Ark.com

December 2013 – July 2014

• Developed, debugged, and supported Node.js applications managing social user information with Elasticsearch and Redis backends.
• Built data collection and processing pipelines using Node.js and npm packages such as async, cheerio, commander, elasticsearch, lodash, and request.
• Implemented automated builds and deployments via Jenkins and Chef, including browser extensions for Chrome, Firefox, and Safari.

Software Engineer – Beget

May 2012 – May 2013

• Developed and maintained tools and public web services to support hosting customers.
• Built a CMS/script and JavaScript usage detection service and participated in data center migration and IP resource expansion.

Call Center Operator / Remote Support Engineer – Yota

Saint Petersburg, Russian Federation · May 2011 – May 2012

• Provided remote technical support via VoIP for consumer and corporate customers of a major Russian 4G wireless provider.
• Gained experience planning shift schedules, diagnosing diverse devices and services, and practicing clear, high-pressure communication.

Software QA Engineer / Developer – Veeam Software

November 2009 – March 2011

• Performed black-box and grey-box testing for Veeam nworks SPI products on Windows and Unix (HP-UX, Solaris), including load and stress tests.
• Implemented new features and fixed bugs using shell, Java SE, ECMAScript, and HP SPI.
• Contributed to porting the product to Linux and achieving HP certification, and created tooling, test cases, and documentation for QA.

Software Engineer, System/Network Administrator – Hosting Concepts BV

February 2008 – September 2009

• Monitored and maintained corporate infrastructure in data centers and offices, including large Virtuozzo VPS fleets and hosting/billing platforms.
• Designed and implemented distributed virtual web hosting architectures and enterprise backup solutions.
• Implemented improved monitoring with Zabbix, developed internal web resources (Drupal/PHP/MySQL), and automated operations with shell and awk.

Software Engineer, Technical Support – NIR-Telecom

October 2006 – February 2008

• Developed internal systems based on Lotus Notes Domino, including inventory accounting and document workflow solutions.
• Maintained technical documentation and supported client communications.

Technical Support Engineer – SWsoft

November 2004 – April 2006

• Provided worldwide technical support (email/phone) for hosting and virtualization products.
• Diagnosed and resolved a wide range of service issues (HTTP, FTP, DNS, mail, and others) on customer servers.
• Trained new support engineers, coordinated support shifts, and achieved Microsoft certification.

Education

• Lyceum of Information Technologies – junior programmer, Information Technologies (1993–1998)

Contact & Profiles

• LinkedIn: linkedin.com/in/casualuser
• Upwork: upwork.com/freelancers/casualuser

You can reach out for:

• DevOps and cloud architecture engagements
• AI/LLM infrastructure and integrations
• Backend/API engineering and high-scale automation