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Hi, I’m Kenta Nishiyama. I’m a Sr. Backend & LLM Engineer who loves building scalable, secure AI-powered systems. I design and implement backend architectures, optimize LLM inferences, and integrate NLP features into customer-facing chatbots. I’ve delivered robust microservices and data architectures for companies across Japan and Europe, focusing on performance, security, and collaboration with cross-functional teams to turn complex ideas into reliable software.…Hi, I’m Kenta Nishiyama. I’m a Sr. Backend & LLM Engineer who loves building scalable, secure AI-powered systems. I design and implement backend architectures, optimize LLM inferences, and integrate NLP features into customer-facing chatbots. I’ve delivered robust microservices and data architectures for companies across Japan and Europe, focusing on performance, security, and collaboration with cross-functional teams to turn complex ideas into reliable software.

Kenta Nishiyama

PRO

AI Engineer, Blockchain Developer, Web Developer, +7

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Hi, I’m Kenta Nishiyama. I’m a Sr. Backend & LLM Engineer who loves building scalable, secure AI-powered systems. I design and implement backend architectures, optimize LLM inferences, and integrate NLP features into customer-facing chatbots. I’ve delivered robust microservices and data architectures for companies across Japan and Europe, focusing on performance, security, and collaboration with cross-functional teams to turn complex ideas into reliable software.…Hi, I’m Kenta Nishiyama. I’m a Sr. Backend & LLM Engineer who loves building scalable, secure AI-powered systems. I design and implement backend architectures, optimize LLM inferences, and integrate NLP features into customer-facing chatbots. I’ve delivered robust microservices and data architectures for companies across Japan and Europe, focusing on performance, security, and collaboration with cross-functional teams to turn complex ideas into reliable software.

Available to hire

Anchorage, United States

Hi, I’m Kenta Nishiyama. I’m a Sr. Backend & LLM Engineer who loves building scalable, secure AI-powered systems. I design and implement backend architectures, optimize LLM inferences, and integrate NLP features into customer-facing chatbots.

I’ve delivered robust microservices and data architectures for companies across Japan and Europe, focusing on performance, security, and collaboration with cross-functional teams to turn complex ideas into reliable software.

Skills

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Work Experience

Sr. Backend & LLM Engineer (AI agent) at Miquido

October 1, 2022 - November 24, 2025

Led development of an AI-powered chatbot, integrating machine learning and NLP. Implemented prompt engineering including CoT, ZeroShot, FewShot to ensure reasoning and consistent output. Built infrastructure for fast inference and high load (200-300 requests/min). Designed RAG architecture with llamaindex to provide context from historic data and reduce hallucinations. Improved similarity scores using OpenAI ada-2 embeddings. Integrated voice AI with Parler-TTS, and deployed secure backend with CSP, Auth0 in Okta for authentication/authorization. Built polyglot databases (PostgreSQL, MongoDB) and optimized for diverse data types. Implemented security best practices to prevent SQL injection.

Backend Developer at Aozora Bank

July 1, 2022 - July 1, 2022

Contributed to Stera Payment Platform; improved website speed by 30% via Akamai CDN, edge caching, Brotli, Early Hints. Built microservice-based infrastructure with Nest.js. Implemented CI/CD with Docker, Terraform, GitHub Actions; integrated ESLint, Prettier, Jest. Optimized Redis caching, indexing and queries; integrated third-party services (ComplyCube, Stripe, Okta) and webhooks; improved SEO via Next.js SSR; built secure backend with Django/Ruby on Rails. Implemented BullMQ-based job queue for automation; added server-side caching with Redis.

Jr Backend Developer at Senda Japan

April 1, 2019 - April 1, 2019

Developed water risk management system using Express.js; designed database structures with MySQL; implemented CDN with jsDelivr and Amazon S3; built data flow for cross-platform tracking and remarketing using Google Analytics and DoubleClick; collaborated on RESTful API service architecture.

Backend Developer at Aozora Bank

June 1, 2019 - July 1, 2022

Participated in building the Stera Payment Platform; improved website response speed by 30% via Akamai CDN with edge caching, Brotli, and Early Hints. Designed a microservice-based infrastructure with Nest.js. Established CI/CD pipelines using Docker, Terraform and Github Actions; enforced ESLint, Prettier and Jest. Improved DB performance with Redis caching, indexing, and query optimization. Built real-time workflows integrating services such as ComplyCube, Stripe and Okta with webhooks. Implemented Next.js SSR logic and backend security using Django and Ruby on Rails. Designed a robust job queue with BullMQ and server-side caching with Redis.

Jr Backend Developer at Senda Japan

April 1, 2017 - April 1, 2019

Developed a Water Risk Management system using Express.js backend. Defined database structure with MySQL for seamless communication. Implemented CDN via jsDelivr and Amazon S3. Built backend data flows for Cross-Platform Tracking and Dynamic Remarketing using Google Analytics and DoubleClick Floodlight. Collaborated on the RESTful API service architecture with senior engineers.