[HCM] AI Product Builder (Java, AI)

We are scaling product development alongside the evolution of generative AI. In this role you turn ambiguous intent into working prototypes and high-fidelity handovers to engineering. You operate in a paradigm shift toward meta-engineering: orchestrating generative AI, prompts, and tools—not only hand-coding from static specs—while our products address B2B back-office domains (e.g., accounting, HR) and rising expectations for clarity, speed, and a credible path to scale.

About the role

An implementer who takes direction from product and domain experts, uses generative AI (LLMs), no-code/low-code, and hands-on engineering to move from “what to build” to working prototypes and initial implementations in days—not weeks. This role bridges product, UX, and engineering: you shape the “how” at maximum speed, then hand off testable, specified work to the broader engineering organization.

Responsibilities

1. AI & System Design

• Design and orchestrate AI agents, skills, and multi-step workflows integrated into microservices and frontend architectures.
• Translate business requirements and domain constraints into explicit UX flows, data contracts, and technical specifications.

2. Full-Stack Engineering & Velocity

• Develop end-to-end applications and features using Java/Kotlin, Spring Boot, and React JS.
• Build rapid, functional prototypes and vertical slices using a hybrid of custom code, AI-assisted tools, and low-code solutions to validate concepts quickly.

3. Delivery, Scale & Modernization

• Package and deliver production-ready, testable code and documentation for seamless integration into the broader engineering ecosystem.
• Analyze, refactor, and extend legacy codebases using AI-driven diagnostic and coding tools.
• Drive continuous improvement across the engineering stack by pioneering new AI development methodologies, templates, and platforms.

4. Key Enhancements Made

• Technical Integration: Linked standard engineering tools (Spring Boot, React) directly to AI workflows so candidates know they will write real code, not just build prompt chains.

Full-stack engineering depth (required)

You are not only a prompt author: you ship full-stack software and can own thin slices end-to-end when the prototype must be real.

• End-to-end feature development: backend services and SPAs; comfort moving across the stack for prototypes and v1 implementations.
• Backend: strong hands-on skills in Java or Kotlin; RESTful APIs; sound approach to microservices and backward compatibility where relevant; performance, concurrency, and clean structure in code.
• Frontend: solid experience with modern frameworks such as React.js, Next.js, Vue.js, Nuxt.js, or Angular.js; strong JavaScript, TypeScript, HTML, and CSS; awareness of testing (e.g. Jest/Mocha) and quality (linting, reviews).
• Data: strong SQL skills and query tuning; ACIDaware design for transactional behaviour in prototypes.
• Delivery: CI/CD (e.g. GitHub Actions, CircleCI, or similar), Git workflows, code review habits; AWS and Docker for deployable prototypes; Kubernetes exposure is a plus.
• Reliability and security in scope of the prototype: authentication/authorization patterns, JWT/OAuth2 at a level appropriate to demos and handover notes; SLO/SLI thinking and observability hooks where the prototype will graduate.
• Leadership of craft: contribute to architecture for your domain verticals; mentor others; incident mindset (when things break, fix and document).

Required experience and skills (must have)

• Generative AI: 
  • Agentic Frameworks & Workflows: Hands-on experience designing and orchestrating AI agents, custom skills, and multi-step workflows (e.g., via LangChain, LlamaIndex, Semantic Kernel, or similar frameworks/tools).
  • AI-Assisted Development: Advanced proficiency with AI-driven coding tools (e.g., GitHub Copilot, Cursor, Claude, ChatGPT) to accelerate system design, debugging, and code generation.
• Substantial software engineering and/or product-minded UI/UX delivery—you build things yourself, not only describe them. 8+ years in software development including both backend and frontend experience is the target bar for this principal-level scope.
• Product mindset: Proven track record translating high-level product requirements into detailed requirements and comprehensive technical requirements through close partnership with Product Managers and domain stakeholders.
• Communication: Strong verbal and written English for clarity and alignment in distributed, multinational product engineering teams.
• Prototyping and product iteration using AI tools and no-code/low-code, grounded in user and operational workflow understanding.
• Comfort with ambiguity: ship “something that works first,” then refine in tight loops (agile execution).
• Track record as a central technical contributor on product initiatives that reached users and business outcomes.
• Agile familiarity (Scrum/Kanban); strong problem-solving across technical and product uncertainty.

Preferred (nice to have)

• Micro-frontends, state machines, advanced Golang or Java concurrency.
• Kubernetes, Kafka/RabbitMQ, Prometheus/Grafana/ELK or similar.
• DDD, Clean/Hexagonal architecture; experience in accounting, finance, or other domain-heavy B2B products.
• Open-source or strong continuous learning profile.
• Japanese language skills (not required) — a strong plus for collaboration with Japan-based teams, product, and stakeholders.

Caring Mental & Physical Recreation:

• Hybrid working: 2 days at the office and 3 days WFH
• Working hour: Flexible start 8AM-9AM from Mon-Fri
• Full salary in probation
• Insurance: Applied from Probation period:
  • Social Insurance, Health Insurance, Unemployment Insurance (on 100% salary)
  • Private health insurance & accident insurance. From Managing level: extra for family members
• Bonus: 13th month salary
• 16 - 24 paid days off and more
• Paternity leave: Extra 5 days
• Annual company trip; Quarterly team building
• Billiards & Running club
• Annual health check
• Well-equipped facility: Macbook pro, additional monitor,..

Caring Career & Development:

• Clear Career path
• Foreign language & International technology-related certifications sponsoring
• External & internal training courses
• Soft-skill workshops
• Tech seminars
• Monthly and biannual Recognition Awards
• Performance & salary review: twice/year (Jun & Dec)