Fullstack Software Engineer, Siena

Salary not provided

+ Opportunity for equity or stock grants

React

AWS

TypeScript

Python

Redis

Node.js

Postgres

Terraform

Next.js

Mid and Senior level

London

More information about location

AI-powered customer service platform

Be an early applicant

AI-powered customer service platform

21-100 employees

Artificial IntelligenceCustomer serviceSaaSAutomation

Be an early applicant

Salary not provided

+ Opportunity for equity or stock grants

React

AWS

TypeScript

Python

Redis

Node.js

Postgres

Terraform

Next.js

Mid and Senior level

London

More information about location

21-100 employees

Artificial IntelligenceCustomer serviceSaaSAutomation

Company mission

To make exceptional customer experiences universally available and to tap into the boundless potential of human connection.

Job

Company

Role

Who you are

If you love solving real-world problems, thrive in fast-paced environments, and take pride in shipping great products, this role is for you
3+ years building in Node.js, React, TypeScript, and Express
Strong with PostgreSQL, Redis, and cloud environments (AWS: Fargate, Lambda, EC2, SQS)
Familiar with CI/CD (CodePipeline, GitHub Actions, or similar)
Experience with microservices and scalable systems
Product-driven—you care about the impact of what you ship, not just the code
AI-first—you live in Cursor, Claude Code and are comfortable orchestrating coding agents
Naturally curious and proactive; you don’t wait for instructions, you create momentum

Desirable

Next.js, Python, or event-driven architectures
Infra-as-code (Terraform, CDK)
Experience integrating with LLMs in production
Event-driven architecture experience

What the job involves

As a fullstack 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, shaping our roadmap while building reliable, high-performance systems
Your code will power millions of monthly customer interactions across global brands, where reliability and speed directly impact business outcomes
Design, build, and maintain scalable features across the full stack (frontend, backend, and infra)
Collaborate with Product to break down scope into iterative, high-impact releases
Integrate cutting-edge LLM capabilities into real enterprise workflows
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
Exercise high agency and ownership—taking initiative, making decisions, and driving ideas to production

Salary benchmarks

Our take

Customer service plays a pivotal role in the success or failure of commerce businesses, with a good customer service experience proven to build trust and power repeat purchases. With this in mind, Siena supplies a platform for companies to automate their customer service responses with AI capable of responding in the brand's voice and acting with "almost human" empathy.

Siena's platform can be employed for a number of customer service interactions, such as answering queries or arranging refunds and returns. The idea is to reduce the workload of customer services teams, with the platform handling over 80% of day-to-day interactions so that human team members are free to focus on more important or unique cases.

The idea is certainly an interesting one, and with its potential to save commerce companies thousands on customer support it is no surprise it boasts a number of clients already. 2023 funding will go towards hiring, go-to-market plans, and further development - with the ultimate goal for Siena to become a fully autonomous agent.

Steph

Company Specialist at Welcome to the Jungle

Company

Funding (1 round)

Nov 2023

$4.7m

SEED

Total funding: $4.7m

Company benefits

🏠 The flexibility to work from anywhere
🌞 Flexible working hours
💸 Stock options
🌴 Unlimited PTO (minimum of 15 days off per year)
📖 Growth stipend

Company HQ

SoMa, San Francisco, CA

Leadership

Andrei Negrau

(CEO)

Also co-founded Cartloop and Relevon, and founded Elite Brands.

Lisa Popovici

(CMO)

Also co-founded Cartloop and Relevon, acting as COO at both as well as Head of Growth and then CMO at Cartloop.

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