Rust Blockchain Infrastructure & Distributed Systems Engineer | Solana • Move VM • High-Performance Backends I build production-grade Rust backend infrastructure that powers blockchain protocols, RPC services, data pipelines, and distributed systems. My code doesn’t just “work” — it is correct, observable, fault-tolerant, and built to survive real-world load. If you need a Rust engineer who understands systems, protocols, reliability, and scale (not just feature coding), I design infrastructure that future teams can maintain with confidence. What I Do I specialize in blockchain infrastructure and backend engineering: • Distributed systems & high-throughput backends (Rust) • RPC / JSON-RPC / gRPC servers for blockchain nodes & validators • Durable execution engines, intent pipelines & submission systems (Solana) • Move VM runtime & smart contract execution layers • Async message brokers & event pipelines (Kafka, NATS, Redis Streams) • On-chain data ingestion, indexing & wallet analytics pipelines • Observability, structured logging, tracing & fault-tolerance • Performance optimization, memory profiling & horizontal scaling • Internal protocols, serialization & deterministic execution I actively build and maintain open-source Rust projects focused on durable execution, high-performance RPC services, transaction security, and blockchain data pipelines. Engineering Values Most engineers focus on features. I focus on systems that survive real-world load. That means: ✔ Clear boundaries & clean interfaces ✔ Deterministic, predictable behavior ✔ Structured error handling & recovery paths ✔ Observability + metrics + tracing ✔ Performance-aware async design (Tokio/Axum/Tower) ✔ Maintainable code & backwards compatibility My systems are readable, testable, diagnosable, and operable. Typical Projects Clients hire me to: • Build or fix Rust backends for Solana, Move, or multi-chain protocols • Design durable execution platforms and RPC infrastructure • Implement high-throughput data pipelines and indexing services • Add reliability, observability & fault-tolerance to existing systems • Optimize latency, memory usage and throughput • Integrate Kafka/NATS/Redis for blockchain event streaming Good Fit For ✔ Blockchain infrastructure teams, validator operators & DeFi protocols ✔ Companies scaling on-chain data or RPC services ✔ Technical founders who need production-grade Rust systems ✔ Long-term reliability & maintainability, not quick hacks Not a fit for: ✘ Pure frontend or mobile-only work ✘ “Just ship an MVP” projects with no reliability requirements Tech Stack Languages: Rust (primary), TypeScript Rust Ecosystem: tokio, axum, tower, tracing, serde, sqlx, reqwest Blockchain: Solana, Move VM, JSON-RPC, validators & oracles Data & Infra: Postgres, Redis, RocksDB, ClickHouse, Kafka, NATS Tools: Docker, Linux, Nix, CI/CD, AWS, bare metal My Philosophy Production systems must be reliable, understandable, maintainable, observable and upgradeable. I write code that fails loudly and predictably, surfaces metrics, scales horizontally, isolates failures, and treats correctness as a non-negotiable feature.

🔹 Designed and developed the backend systems, content generation agents and RAG-based conversational chatbots through Langchain and OpenAI at a content generation start-up, pockla.io 🔹 Engineered the no-code Computer Vision Platform to build, monitor and maintain Computer Vision based AI models at sixsense.ai.(Django, React and PostgreSQL) 🔹 Constructed backtests, quant trading algorithms, trading bots, rule-based portfolios and pine scripts for at least 20 clients on Upwork and for Morningstar 🔹 Created custom AI models by training on images and fine-tuning models for a computer vision start-up. sixsense.ai 🔹 Designed and executed the universe construction, portfolio construction and backtesting framework at Morningstar Indexes. 🔹 Developed full-stack AWS/GCP/Azure applications at Sustainergy, Pockla, Sixsense and WriteScore. 🔹 Setup algorithmic trading systems for stocks/crypto/options/futures in Zerodha | TradingView | IBKR | Binance | CCXT) 🔹 Set up big data pipelines, ETL and data warehouses. (S3, Glue, Spark, Postgres, Kafka) 🔹 Build UI designs, React/Angular website, Flutter Android and iOS Apps 🔹 Set up the CI\CD pipeline in Jenkins/Github actions through Docker and Terraform and deploy them to AWS/GCP/Azure through Terraform 🔹 Collaborated on the event-based architecture setup through Kafka, AWS DynamoDB and AWS ECS. 🔹 Have worked and integrated with different workflow systems like Stepfunction, Airflow and JBPM. 🔹 I have a master's in Physics and a bachelor's in Mechanical Engineering 🔹 I love tinkering with new technologies and learning new stuff. ★ Below are my skills. ★ 🔹 Programming Languages 🔹 ✤ Python ✤ Java ✤ Dart ✤ Javascript ✤ C ✤ C++ ✤ Dart 🔹 AI 🔹 ✤ Open AI APIs ✤ LLM ✤ DALL-E ✤ ChatGPT ✤ Vicuna ✤ GPT4All 🔹 Frameworks 🔹 ✤ Django ✤ Spring Boot 🔹 Quant 🔹 ✤ Backtesting ✤ Pine Script ✤ Trading View ✤ Portfolio Construction ✤ Portfolio Calculation ✤ Trading algorithm - Algo trading ✤ Trading bot ✤ Data extraction of Stocks / Crypto / Mutual Funds / Forex ✤ Yahoo Finance 🔹 Cloud services 🔹 ✤ AWS - Amazon Web Services ✤ GCP - Google Cloud Platform ✤ Azure - Microsoft ✤ Linode 🔹 Database 🔹 ✤ SQL ✤ Stored procedures ✤ PostgreSQL - PostGIS ✤ Mongo DB ✤ Sql Server ✤ Dynamo DB ✤ Mysql ✤ Redshift ✤ SQLite ✤ Clickhouse 🔹 Technology 🔹 ✤ Apache Kafka ✤ Apache Flink ✤ Apache Spark (pyspark) ✤ Drools ✤ API / Rest ✤ Hadoop 🔹 Front-end / UI 🔹 ✤ React ✤ Flutter ✤ React Native ✤ HTML ✤ CSS 🔹 Message queues 🔹 ✤ Redis ✤ Celery ✤ RabbitMQ 🔹 Workflow 🔹 ✤ Stepfunction ✤ Airflow ✤ JBPM 🔹 AWS Services 🔹 ✤ Lambda ✤ S3 - Simple Storage Service ✤ ECS - Fargate ✤ EC2 ✤ ECR ✤ Cloudwatch Logs ✤ Cloudwatch Events ✤ EventBridge ✤ SNS - Simple Notification Service ✤ SQS - Simple Queue Service ✤ Sagemaker ✤ AWS Glue ✤ Athena ✤ Stepfunction ✤ AWS DMS ✤ Application Load Balancer ✤ AWS RDS (Postgres, MySql) 🔹 Data Science 🔹 ✤ Data Mining ✤ Data Engineering ✤ Data Scraping ✤ Data visualization ✤ Statistics ✤ Machine Learning ✤ Computer Vision 🔹 DevOps 🔹 ✤ Jenkins ✤ Docker ✤ Terraform ✤ Github Actions ✤ Gitlab ✤ Splunk ✤ GIT ✤ Unit testing ✤ Integration testing 🔹 Project Management 🔹 ✤ AGILE ✤ JIRA ✤ Wiki ✤ Confluence ✤ Airtable 🔹 Operating Systems(OS) 🔹 ✤ Windows ✤ Linux ✤ MacOS \ Mac ✤ Ubuntu ✤ Unix 🔹 Domain 🔹 ✤ FinTech ✤ SaaS ✤ Manufacturing ✤ Semiconductor 🔹 Thank you for reading till the end :) 🔹 Let's build something great together and have fun on the journey!

I built an AI voice agent for auto shops that increased their monthly revenue by 22% handling after-hours calls, booking appointments, and delivering post-call analytics. That's the kind of work I do: full-stack products that move real business numbers. Over the past 3+ years, I've shipped production SaaS apps, internal tools, and data platforms for startups and growing teams. My work includes: → AI agent with call analytics that drove measurable revenue growth for auto shops → Restaurant CRM with real-time KPI dashboards, BI reporting, and multilingual support → Dental practice management system: scheduling, patient records, billing, and automated communication → Privacy-first email product with dynamic inboxes and serverless architecture → Backend optimizations that cut production load times by 40% I work best with founders and product teams who need a developer that can own the full build from architecture decisions to production deployment. Have a project in mind? Send me a message and let's talk.

I’m a technical QA engineer who finds issues before users do—across UI, APIs, and data. I write clear bug reports, validate complex flows, and build automation that reduces regression risk and speeds up releases. With ~10 years in Java and QA automation lead experience in product companies (iGaming), I’ve built custom, maintainable test frameworks and stabilized CI pipelines. I can help with: * Manual QA: functional/regression/exploratory testing, UX issues, release checklists * API & technical validation: Postman/RestAssured, JSON validation, logs/data checks * Automation: Selenium UI + API tests (JUnit/RestAssured, custom frameworks), Testcontainers, Allure, CI integration * Performance: JMeter/Gatling (optional) I’m happy to start manually and add automation where it gives the highest ROI. Open to a short paid trial (5–10 hours) to prove fit quickly.

8+ 𝘆𝗲𝗮𝗿𝘀 𝗶𝗻 𝗮𝗹𝗹 𝘀𝘁𝗮𝗴𝗲𝘀 𝗼𝗳 𝗔𝗴𝗶𝗹𝗲-𝗦𝗰𝗿𝘂𝗺 𝘀𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁. 🎯 𝗜 𝗵𝗲𝗹𝗽 𝗦𝘁𝗮𝗿𝘁𝘂𝗽𝘀 𝗮𝗻𝗱 𝗦𝗠𝗕𝘀 𝘁𝗼 𝗯𝘂𝗶𝗹𝗱 𝗶𝗻𝗻𝗼𝘃𝗮𝘁𝗶𝘃𝗲 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝘀 𝗮𝗻𝗱 𝗱𝗶𝗴𝗶𝘁𝗶𝘇𝗲 𝗲𝘅𝗶𝘀𝘁𝗶𝗻𝗴 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀𝗲𝘀 𝘄𝗶𝘁𝗵 𝘁𝗿𝗮𝗻𝘀𝗽𝗮𝗿𝗲𝗻𝘁 𝗽𝗿𝗼𝗰𝗲𝘀𝘀𝗲𝘀 𝗮𝗻𝗱 𝘀𝘂𝗽𝗲𝗿𝗶𝗼𝗿 𝗺𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁. Hi, I'm Oleksandr, a Full-Stack TS Developer specializing in modern JavaScript frameworks like React.js, React Native, and Node.js, with extensive experience in TypeScript. I’m proficient in building scalable, high-performance applications using cutting-edge web technologies, ensuring your business goals are achieved with precision. Your software project is in safe hands—my approach involves deep research, careful planning, and the consistent implementation of your ideas, coupled with regular updates and continuous support. Beyond delivering high-quality code, I place a strong emphasis on collaboration, working closely with clients and partners to ensure we align at every step. Technologies I work with: TypeScript: Expertise in applying TypeScript to build maintainable, scalable codebases Front-end: React.js (with TypeScript), React Native, Next.js Back-end: Node.js, Go, Python API Development: REST APIs, GraphQL Testing: Jest, Mocha, Cypress, Selenium, Playwright Databases: PostgreSQL, ClickHouse, MongoDB, CockroachDB DevOps: Terraform, Kubernetes, ELK Stack (Elasticsearch, Logstash, Kibana) _ Why choose me? Fast project kickoff and continuous support Transparent agreements and well-structured processes More than just coding — I offer real solutions for your business needs Specialize in building MVPs for startups using the latest tech stack, including TypeScript Still unsure? Invite me to a complimentary consultation call on Upwork, and let's discuss how I can help solve your business needs.

I’m a Software Engineer & Product Manager with 10+ years of experience in building and managing digital products, optimizing software development workflows, and driving product strategy. My background spans software engineering, blockchain infrastructure, and technical product leadership, allowing me to bridge the gap between technical teams, product vision, and business goals. 🔹 What I Do Best: • Software Development – Building and optimizing backend systems, APIs, and blockchain applications using Python, Solidity, and JavaScript/TypeScript. • Product Management & Strategy – Defining product roadmaps, managing backlogs, and aligning engineering teams to ship impactful features. • Technical Program Management – Leading multi-team development efforts, coordinating SDK & API integrations, and optimizing engineering workflows. • Data-Driven Decision Making – Conducting on-chain analytics, financial risk modeling, and user behavior analysis to improve product performance. 🚀 Notable Work: • Managed risk parameter frameworks and on-chain research for DeFi protocols. • Led multi-team SDK & API integrations across 13+ programming languages. • Developed an investigative analytics platform for cryptocurrencies at Bitfury. • Built and launched an MVP of a national digital currency with a gasless UX. I thrive in fast-moving environments, working with cross-functional teams to deliver scalable, secure, and user-centric products. Let’s connect and build something great! 🚀

DevSecOps Engineer with strong IT security & programming background. 🔒 CompTIA A+, Network+, Security+ ,💣 PenTest+, CySA+, Linux+ Certified, 🐋 Certified Kubernetes Application Developer (CKAD) Experienced with Kubernetes, Helm, Terraform, Google Cloud Platform, Amazon Web Services, Docker, Cilium, Jenkins, Ansible and many other technologies. I have strong Linux🐧, Networking and IT Security skills. 👔 I practice my craft almost every single day in a year: doing CI/CD, engineering, including IT security engineering. Tools and topics I have experience with include: 👉 Infrastructure Provisioning and Configuration Management: Terraform, Ansible, kubeadm, kolla-ansible (openstack) 👉 Container Orchestration: Kubernetes, CRI-O, docker, Rancher, RKE3, K3S 👉 Networking and Security: HashiCorp Vault, Tailscale, OPNSense, WireGuard, OpenVPN, DefectDojo, Microsoft Sentinel, IBM QRadar, IntelMQ, Cilium, nftables, OpenVAS, Maltego, metasploit, nmap, burpsuite, zaproxy, Mikrotik, OWASP SAMM, OWASP WSTG, ISO/IEC 27001, NIST CSF (NIST Cybersecurity Framework), CIS Benchmarks, CIS Controls, CISA SCuBA, yara, Netflow, Autopsy, ESET MC, McAfee ePO 👉 RDBMS: PostgreSQL, MySQL, MariaDB, Galera 👉 Other storage: Redis, Memcached, NATS Jetstream, NATS Core, Clickhouse, Elasticsearch/ELK, Kafka, Clickhouse, Zookeeper, etcd, Consul, ELK 👉 Observability and Monitoring: Jaeger, Fluentd, Graylog, Prometheus, Alertmanager, Grafana, CheckMK, Zabbix, NetData 👉 CI/CD: Bitbucket, Confluence, Gitlab, Github, Github Actions, Bamboo, Jenkins, Groovy, Gradle, Maven, Helm, ArgoCD, GitOps, SonarQube, packer 👉 Programming: PHP, Laravel, Python, Django, Cloudevents

Hi myself aman kumar, A graduate of IIT Kharagpur and Top rated at Upwork, I am a skilled Data Scientist and AI / ML / LLM / GenAI Engineer with multiple years of experience, I've successfully contributed to startups, building scalable software solutions. As a graduate of IIT Kharagpur, I bring a solid academic foundation to my practical skills. My background includes impactful projects in Natural Language Processing , Computer Vision and Time-Series Analysis, demonstrating a deep understanding of complex data domains. With a network of skilled engineers, our project is uniquely positioned for success, marked by innovation, reliability, and impactful outcomes. I am proficient in: ✅ Data Science , Machine Learning and Deep Learning: ● Classification and Regression tasks ● Unsupervised tasks (Clustering , Association ...) ✅ n8n & Intelligent Workflow Automation ● End-to-End Workflow Automation (CRM, Marketing, Support, Data ETL) ● Integration with AI Models, APIs, Webhooks & Databases ● Event-Driven Automation: Triggering AI tasks in response to data changes ● Custom Automations: Data prep, Alerts, Reporting, Scheduling, Slack/Email ● Orchestration of complex business logic using n8n nodes & JavaScript Tech Stack: n8n, JavaScript, REST/GraphQL APIs, Postgres, Airtable, Slack/Email/S3, Webhooks ✅ Time-series prediction ● Time Series Analysis (ARIMA, SARIMA, Prophet ...) ● Time Series Forecasting (Single Step , Multi-Step forecasting) ● Time Series Classification ● Hierarchical Time Series Forecasting ● Demand Forecasting using ML regression models (LightGBM, Random Forest, XGBoost ...) ✅ Natural Language Processing (NLP) and LLMs: ● Text classification (including Sentiment Analysis, Aspect-Based Sentiment Analysis) ● Named Entity Recognition (NER, automatic extraction of relevant entities, like names, locations, dates, etc) ● Chat-Bots (Deep Learning or Rule-Based chat-bots for various domains) ● LLM Fine-Tuning: Expertise in fine-tuning LLMs (large language models) like GPT-3, GPT-4, Llama, T5 etc for specific tasks and domains, leveraging transfer learning to improve model performance on niche datasets. ✅ Computer Vision (CV): ● Image Classification ● Object Detection (YoLo) ● Instance segmentation / Semantic Segmentation (Mask R-CNN) ● Optical Character Recognition (OCR) 🎓 Advanced proficiency in the following domains, ✦ Model Deployment ✦ Model Training ✦ Model Fine-tuning ✦ Knowledge Extraction ✦ Ad Hoc Structured Data Query ✦ AI Voice/Speech Agents ✦ RAG Enhancement ✦ Generative AI / Gen AI ✦ Prompt Engineering ✦ Long Term Memory and Continual Learning ✦ Performance Analysis ✦ LLM Evaluation ✅ Full-Stack Development: ● Backend (FastAPI, Flask, Django, django-rest-framework, Node.js, JavaScript, PHP, Yii Framework) ● Frontend (Vue.js, React.js) ● WordPress ● CI/CD (Docker, docker-compose, Kubernetes, k8s, Ansible, Terraform) ● Databases (PostgreSQL, MySql, MongoDB, OracleDB, ArangoDB, ClickHouse, GraphDB) ● AMQ (Celery, RabbitMQ) 💼 Some mainstream industries and business domains that I have worked with, ✦ CRMs ✦ Healthcare ✦ Operations ✦ Education, Edtech ✦ Legal (Regulation, Compliance) ✦ Real Estate ✦ Retail & E-commerce ✦ Travelling and Hospitality Frameworks: SpaCy, HuggingFace, Transformers, NLTK,LangChain, PyTorch, TensorFlow, Keras, DarkNet, Detectron, Detectron2, Fast.ai Annotation platforms: Doccano, ProdiGy, Clarifai, CVAT, Clarifai Architectures: BERT, LongFormer, GPT-3, RAG, GPT-4, GPT-4o Domains: MedTech, E-Commerce, HRM, AD-tech, Medical Imaging, CCTV (surveillance), NFT, LegalTech (document analysis) Technical skills: Python, Javascript, Go, Java, Spring Boot, Gradle, Node.js, react.js, react native, Android Studio, ios app developer, swift, Angular, Tensorflow, Keras, NumPy, Serverless Frameworks, Docker, Terraform, Ansible, Kubernetes, Jenkins, Spinnaker, GitOps, DataOps, AWS. GCP, Azure, JAMstack, GraphQL, MEAN Stack, React, Redux, ES6, Express, MongoDB, Redis, Linux, Etcd, Consul, Kinesis, Redshift, DynamoDB, Spark, Hadoop, Kafka, PostgreSQL, MySQL, ELK, Sass, Webpack, Gulp, Git, Ethereum, Solidity, OpenZeppelin, Truffle, Flask, Django, MCP , Teradata MCp, Flowise, n8n. Key Highlights: ⭐️ Available 7 days a week ⭐️ Fluent in English ⭐️ Fast response time ⭐️ Give updates daily ⭐️ Long-term project support ⭐️ Upwork Top Rated ⭐️ 100% Job Success Score Thanks for your consideration!

I specialize in creating scalable Computer Vision and LLM solutions, architecting robust data platforms, and developing high-performance applications. From applied research and MLOps to full-stack development, I deliver comprehensive solutions that drive business impact. Core Expertise & Technology Stack: 1. AI & Machine Learning: - Languages & Tooling: Python, PyTorch (Lightning), OpenCV, WanDB - Computer Vision: Multi-Object Tracking (ByteTrack), Person Re-Identification, Image Classification, Object Detection (YOLO) - LLM Development: RAG Chatbots & Multi-Agent Systems using LangGraph, CrewAI, LlamaIndex, and vLLM for model hosting. - MLOps & Infrastructure: Ray (Serve, Train), Kafka, Redis Queue, Docker, Kubernetes 2. Backend Engineering & System Design: - Languages: Python, TypeScript, Golang - Frameworks: FastAPI, NestJS - System Architecture: Microservices, Asynchronous Programming (Asyncio), Multi-threading, Job Queues, Event driven 3. Frontend & Application Development: - Web: React.js, Next.js - Mobile: React Native (Cross-platform), Swift (Native iOS) - Desktop: PyQt6 4. Data Engineering: - Orchestration: Dagster, Apache Airflow - Data Warehouses: ClickHouse, Google BigQuery, Oracle Autonomous DB - Databases: PostgreSQL, MySQL (OLTP); MongoDB, Cassandra (NoSQL); Redis (Cache) - Data Crawling: Scrapy, Selenium, Playwright 5. DevOps, Cloud & Monitoring: - Cloud Platforms: AWS, GCP, Azure, Oracle OCI - Monitoring & Observability: ELK Stack, Splunk, Grafana & Prometheus, New Relic 6. Business Intelligence & Analytics: - Visualization Tools: Power BI, Google Looker Studio - Google Analytics Ready to transform your complex requirements into robust, market-ready products? Let's connect!

20 years experience in IT(overlapping): - software development - 15 year (Python, C/C++, Perl) - management - 9 years - Linux system administration and network engineer - 7 years As an architect and developer specialized in high-load applications with complex business logic. Now my main technology stack is Python. I have extensive experience with VoIP and micro-service architecture, REST, GraphQL. My Technology stack: - Python, Django, FastAPI, Aiohttp - Linux, Docker, Kubernetes - Nginx - PostgreSQL, MySQL, MonoDB, Redis - Git, Gitlab, CI/CD - AWS, Google Cloud