Siena AI

Senior Fullstack Engineer

Bucharest, Bucharest, Romania

Not SpecifiedCompensation
Senior (5 to 8 years)Experience Level
Full TimeJob Type
UnknownVisa
Artificial Intelligence, Enterprise Software, Customer Support AutomationIndustries

Position Overview

  • Location Type: Remote
  • Employment Type: Full-Time
  • Salary: (Salary information not provided)

Siena is building enterprise empathic AI Agents powered by reasoning-adept LLMs. Siena is the first AI Agent of its kind, designed to integrate with existing systems and interact with customers across multiple channels from a single, unified platform. If you're excited about the intersection of human-to-machine communication and want to be part of a team driving innovation and making a real impact in automating agentic workflows, join us on our mission to revolutionize customer experience through empathetic AI.

About Siena

Siena is focused on AI-First workflows, believing that leveraging AI empowers individuals to work smarter, faster, and more creatively. The team embraces AI-powered augmentation in everything they do.

About the Role

As a Full Stack Engineer at Siena, you’ll own projects end-to-end, developing and optimizing features within our AI-powered customer support automation platform. You’ll work closely with product and engineering teams, shaping our roadmap while building reliable, high-performance systems. This role is for engineers who love solving real-world problems, thrive in fast-moving environments, and take pride in shipping great products.

Responsibilities

  • Design, build, and maintain scalable features across the full stack (frontend, backend, and infrastructure).
  • Collaborate closely with Product to break down scope and deliver in iterative, high-impact releases.
  • Work on an AI-first product, integrating cutting-edge LLM capabilities into enterprise customer support workflows.
  • Solve complex engineering challenges, from optimizing API performance to refining microservices architecture.
  • Maintain and improve our cloud infrastructure (AWS) with a DevOps mindset.
  • Share knowledge and mentor teammates, fostering a strong engineering culture.

Requirements

  • 7+ years of software engineering experience in Node.js, React, TypeScript, and Express.
  • Solid experience with cloud environments (AWS – Fargate, Lambda, EC2, SQS).
  • Strong database skills with PostgreSQL and Redis.
  • Familiarity with CI/CD pipelines (CodePipeline, GitHub Actions, or similar).
  • Product-focused mindset – you think beyond just code and care about business impact.
  • Deep experience in microservices architectures and scalable systems.

Bonus Points

  • Experience with Next.js and LLM integrations.
  • Infrastructure as Code (CDK, Terraform).
  • Python programming skills.
  • Event-driven architecture experience.
  • Background in customer support software.

Why Join Us

  • Make a real impact. Your work directly shapes our product and company.
  • A voice that matters. In a small team, every perspective counts – yours included.
  • Work your way. Whether it’s from home, a coffee shop, or a moon base – if you’re productive, we’re happy.
  • Competitive compensation.

Skills

Full Stack Development
Frontend
Backend
API Optimization
Microservices Architecture
AWS Cloud Infrastructure
DevOps
AI Integration
Large Language Models (LLMs)
System Design
Performance Optimization
Team Collaboration
Mentoring

Siena AI

Autonomous AI customer service platform for e-commerce

About Siena AI

Siena AI offers an autonomous customer service platform tailored for the commerce sector, enabling businesses to implement AI-driven support with ease. The platform integrates with existing help desk systems, allowing merchants and brands in the e-commerce market to provide timely and accurate customer service. Siena's technology utilizes advanced models from OpenAI, delivering human-like responses and cognitive reasoning capabilities. The company operates on a subscription-based model, offering various service tiers that cater to different business needs, including features like smart routing and the Siena Copilot for human agents. A key differentiator for Siena is its commitment to data security; it does not train its models on client data, ensuring the protection of sensitive information. The goal of Siena AI is to enhance customer support efficiency and accuracy for e-commerce businesses while maintaining a strong focus on privacy.

San Francisco, CaliforniaHeadquarters
2023Year Founded
$4.6MTotal Funding
SEEDCompany Stage
Enterprise Software, Cybersecurity, AI & Machine LearningIndustries
11-50Employees

Benefits

Remote Work Options
Paid Vacation
Stock Options
Company Equity
Professional Development Budget

Risks

Increased competition from companies like Discover Financial Services using generative AI.
Dependency on external partners like LTVplus for technological advancements.
New AI-driven platforms in Eastern Europe may challenge Siena AI's market position.

Differentiation

Siena AI combines human empathy with intelligent automation for customer service.
The platform integrates seamlessly with existing help desk systems for easy deployment.
Siena AI prioritizes data security by not using client data for model training.

Upsides

Siena AI raised $4.7M to develop empathic AI customer service agents.
Partnership with LTVplus enhances customer service through empathic AI.
Subscription-based model ensures steady revenue and scalable customer service operations.

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