I’m a Senior Software Engineer with 7+ years of experience building high-performance backend systems, working across Golang, Python, Java, and cloud-native platforms like AWS, including EC2, S3, RDS, ECR, Opensearch, DocumentDB, and Route53. I’ve delivered scalable, reliable infrastructure and AI-powered applications using LLMs such as GPT-3.5, GPT-4, GPT-4o, and GPT-4o-mini, along with vector databases like Qdrant and pgvector. My work spans intelligent systems, from personalized recommendations to GenAI-powered automation, all focused on simplifying complexity, saving time, and delivering real business value. I'm comfortable navigating ambiguity, picking up new tech fast, and building production-ready systems in weeks. I’ve worked with distributed teams, collaborated across time zones, and shipped outcomes through tight feedback loops. On the infrastructure side, I’ve worked with Docker, Kubernetes, Terraform, and monitoring tools like Prometheus, Grafana, and Datadog, designing systems built for observability, reliability, and scale. I thrive at the intersection of backend architecture, AI integration, and lean, pragmatic engineering, always balancing simplicity with scalability. Major accomplishments: ✅ Redesigned the core job search system at Ladders — the most critical part of the platform — using Golang, PostgreSQL, and pgvector. Delivered 90% of the legacy functionality in just 3 months while improving average response times by 34% and reducing peak latency by 90%. ✅ Replaced a legacy recommendation engine with a new Python + Qdrant system, boosting positive feedback by 70%, reducing negative feedback by 40%, and cutting infrastructure costs by 65%. ✅ Shipped an AI-powered autofill tool that extracts structured work history from resumes using GPT-3.5, deployed via a staff-facing Chrome extension. Saved $25K+ in API costs and eliminated 20+ hours of manual work per week for internal staff. Skills: Languages: Python, Go, Java, JavaScript, TypeScript, ClojureScript, Clojure Technologies and Tools: AWS (EC2, S3, RDS, ECR, Cloudfront, Opensearch, DocumentDB, Route53), PostgreSQL, pgvector, MariaDB, Qdrant, Redshift, Docker, K8s, Terraform, Pulumi, Kafka, Prometheus, Grafana, Datadog, Flask, Spring , React, Google Analytics, Google Search Console

I am a software craftsman and technical lead with over 15 years of engineering and operations leadership experience. My specialty lies in building production systems using Clojure and ClojureScript, complemented by deep expertise in manufacturing, finance, and infrastructure. I combine hands-on full-stack development with strategic insight, ensuring that my solutions are not only functional but also effective in driving business goals. With an MBA and Six Sigma Green Belt certification, I bring a unique blend of technical know-how and managerial acumen to every project. Whether you need a fresh approach to your software development or seek a reliable partner for digital transformation, I can deliver scalable, high-quality solutions tailored to your needs. Let's connect to discuss how I can help you achieve your objectives efficiently and effectively.

I am an enterprise software engineer. I have over 15 years of full stack experience with .net, JavaScript, Java, Clojure etc

I'm an aspiring software developer with the desire to use my skills to meet my customer's wishes. I consider myself a programming language polyglot as I've worked with various languages and paradigms. I specialize in the following technologies: - SQLite and MongoDB - Clojure, Kotlin, and Java - TypeScript, React.js, and Node.js - GraphQL - Docker and Docker Compose - Ansible - AWS - GitLab CI, GitLab

I'm an ex-Google engineer, building a reputation as a top-tier freelancer. -I do top-quality work for cheap, because I'm focused on getting 5-star reviews and references. - I have experience putting real projects in production. I wrote infrastructure at Google that's now running on most mobile phones. - I'm very good at solving hard math problems. Anything data-heavy or algorithmically challenging is a place a really shine. - I can program in anything and the kitchen sink. I've written major projects in Java, Python, Objective C, Clojure, Javascript, etc., and learn quickly. I've contributed to messy infra projects with large codebases, and written mobile apps and websites from scratch. - plz SammyConsulting LLC

Since 2007, I've specialized in back-end programming and database administration with the Wordpress and Django frameworks. I am fluent in PHP, Python, and functional programming as well as PostgreSQL and MySQL. I also have experience in: - AWS - JVM programming - Ecommerce and marketing - SEO - Server configuration and administration I've made contributions to several OSS projects and am one of the primary authors of the Satchmo ecommerce framework. Check out my open-source work at at github.com/john-shaffer

Full-stack software engineer with 8+ years of experience specializing in event-driven architectures and functional programming. Proven ability to deliver robust e-commerce solutions and real-time applications using Clojure, TypeScript, and SvelteKit. Seeking to apply my skills in building complex, scalable systems.

I'm passionate for knowledge graphs. Proficient with both property and RDF graphs and I enjoy writing Cypher, SPARQL.

Experienced Software Engineer with over 5 years of expertise in Clojure and ClojureScript, specializing in Data Engineering (ETL), DevOps, and Security. Proven track record in designing, developing, and maintaining complex software systems, with a strong focus on open-source tools and microservices architecture. Adept at fostering team communication and collaboration, with a firm belief in the importance of thorough planning and dialogue for successful software development. Passionate about Distributed Systems, Functional Programming, and the underlying Mathematical Theories. * 6 years of experience in Clojure, with a deep understanding of its ecosystem and best practices * Proficient in Business and Data-driven analytics, capable of turning complex data into actionable insights * Skilled in modern front-end development with ClojureScript, enhancing user interfaces and experiences

👋 Full-stack software engineer with 5 years of experience building web and mobile applications using React, Next.js, Node.js, React Native (Expo), and Flutter 🚀 I’m new to Upwork, but I’ve worked on large production systems, and I’m comfortable taking ownership, understanding requirements quickly, and delivering reliable solutions. Happy to connect and discuss your project.