Full-Time

Staff Software Engineer

Updated on 8/21/2026

Siena AI

Siena AI

51-200 employees

Autonomous AI-driven ecommerce customer support platform

No salary listed

Remote in UK

Remote

Category
Software Engineering (1)
Required Skills
LLM
Express.js
Python
Distributed Systems
React.js
GitHub Actions
Node.js
Postgres
Infrastructure as Code (IaC)
TypeScript
Microservices
AWS
Terraform
Redis
Next.js
DevOps

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Requirements
  • You have operated at Staff level or are clearly ready to, with other engineers turning to you when technical decisions are difficult.
  • You have 7+ years of software engineering experience with a track record of technical leadership across teams or systems.
  • You have deep full-stack strength in Node.js, React, TypeScript, and Express.
  • You are strong with AWS in production, including Fargate, Lambda, EC2, and SQS, and with PostgreSQL and Redis.
  • You are fluent in microservices and distributed systems and understand when not to use them.
  • You are comfortable owning CI/CD and infrastructure with a DevOps mindset, using CodePipeline, GitHub Actions, or similar tools.
  • You are product-minded and think in customer outcomes and business impact.
  • You have shipped LLM-powered features to production and understand reliability issues when models meet real users at scale.
  • You demonstrate directness, low ego, ownership, and the ability to give and receive honest feedback.
Responsibilities
  • Set technical direction and architecture for major areas of the platform and bring the rest of engineering along.
  • Own the hardest ambiguous, cross-cutting, high-stakes technical problems end to end.
  • Make build-versus-buy and architectural decisions that shape the platform for years, and document the reasoning for others to build upon.
  • Take cutting-edge language models into production within enterprise customer workflows where reliability and safety matter.
  • Raise the engineering bar through design reviews, technical mentorship, and leading by example.
  • Identify technical initiatives the company should run rather than waiting for assignments.
  • Maintain reliability, performance, and scale as the platform grows across channels and brands.
  • Partner directly with product and leadership to shape what is built and how it is built.
Desired Qualifications
  • Experience with Next.js.
  • Experience with infrastructure as code, including CDK or Terraform.
  • Experience with Python.
  • Experience with event-driven architecture.
  • A background in customer support or customer experience software.

Siena.cx provides an autonomous AI-powered customer service platform for ecommerce. It plugs into existing help desks and uses AI models from OpenAI and other sources to generate accurate, human-like responses for customer inquiries. The system includes features like cognitive reasoning and smart routing, and it offers a tiered subscription model that scales with a business’s needs. A key differentiator is Siena’s emphasis on data security: client data is not used to train the models, helping protect sensitive information while the platform analyzes multiple data points in real time to handle complex queries. The goal is to help merchants and brands run efficient, accurate customer support at scale, reducing the workload on human agents and improving customer satisfaction.

Company Size

51-200

Company Stage

Seed

Total Funding

$4.7M

Headquarters

San Francisco, California

Founded

2023

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Simplify Jobs

Simplify's Take

What believers are saying

  • Siena's July 2026 customer stories show Terra Kaffe saving over $3,000 monthly.
  • Simple Modern reported 98% CSAT and 80 hours saved weekly in March 2026.
  • Around 100 brands reportedly use Siena, expanding proof across beauty, fashion, and lifestyle.

What critics are saying

  • Sales-led pricing around $750 monthly plus $0.90 per ticket punishes volume spikes.
  • Shopify-first support blocks WooCommerce, BigCommerce, Magento, and SFCC customers.
  • No fresh funding since November 2023's $4.7 million seed threatens long runway.

What makes Siena AI unique

  • Siena launched Siena Docs in June 2026, syncing wiki, help center, and agent knowledge.
  • Kitsch and Simple Modern cite 68% and 79% automation, proving strong ecommerce execution.
  • Siena integrates with Shopify, Recharge, Loop Returns, and major helpdesks for real actions.

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Benefits

Remote Work Options

Paid Vacation

Stock Options

Company Equity

Professional Development Budget

Growth & Insights and Company News

Headcount

6 month growth

1%

1 year growth

-2%

2 year growth

-1%
Nousu
Jul 19th, 2026
Siena AI review (2026): pricing, fit, and alternatives.

Siena AI review (2026): pricing, fit, and alternatives. A competitor's honest review of Siena AI: what it does well, the $750 per month plus $0.90 per ticket pricing as of July 2026, who it fits, and the alternatives. Siena AI Pricing Alternatives Ezra Klijnsma Founder of Nousu, building AI support agents for online stores Siena AI is an autonomous support agent for larger ecommerce brands. It resolves tickets end to end and does it well. Pricing as of July 2026: a $750 per month platform fee plus $0.90 per automated ticket, with the final quote settled on a sales call. Strong product at an enterprise price, and Shopify-first. The disclosure first: Nousu competes with Siena, so this is a competitor's read. Nousu has tried to keep it fair, and every number below carries a source and a date. Where a claim comes from Siena's own marketing, Nousu say so. What Siena AI does. Siena sells an AI agent built for ecommerce support, aimed at DTC brands. The pitch is autonomy: the agent does not just answer, it acts. Per Siena's site, it can update addresses, generate return labels, issue refunds, send replacements, and manage subscriptions (skip, pause, swap) inside a single conversation. Siena also claims it can handle up to 80% of customer interactions automatically. That last number is marketing, so treat it as a ceiling under ideal conditions rather than a promise. The other thing Siena is known for is brand voice. The product builds "AI Personas" on your tone and customer language, per Siena's site, and this is the part reviewers praise most consistently. If your brand lives or dies on sounding like itself in every reply, Siena has put real work into exactly that problem. What siena does well. Three things stand out, and Nousu say this as a competitor. It executes. Refunds, labels, replacements, subscription changes: these are actions in the store, not paragraphs about policy. Most of the market still stops at answering. Siena committed to finishing the work early, and it shows in how the product is built. The brand voice work is credible. Siena publishes customer numbers on its own site, such as Spanx handling 50% of conversations at 90%+ CSAT and Coterie at 65% automation (per siena.cx, July 2026). Those are vendor-published case numbers, so read them the way you would read any vendor's case numbers. But the pattern in independent reviews matches: customers rarely complain that Siena sounds like a robot. Onboarding is managed. The pricing page lists expert onboarding plus dedicated Slack support (per siena.cx/pricing, July 2026). You are buying a service relationship, not just software. For a larger team that wants a partner on the hook, that is worth something. Siena AI pricing: the reality. Here is the structure as published on siena.cx/pricing, checked July 19, 2026. A $750 per month platform fee for access to the core engine. On top of that, $0.90 per automated ticket. The page then asks you to share details so sales can give you accurate pricing, which means the number you actually pay is settled on a call. Run the math at a few volumes, before any negotiated discount: * 500 automated tickets a month: $750 + $450 = $1,200 per month. * 1,500 automated tickets a month: $750 + $1,350 = $2,100 per month. * 3,000 automated tickets a month: $750 + $2,700 = $3,450 per month. Notice two properties of this model. The $750 lands before the first ticket is automated. And the meter runs on success: the better the agent performs and the better your sales month goes, the higher the invoice. November is your most expensive month by design. If you want to see what this does at your own volume, next to other vendors' published rates, use its support cost calculator. Every rate in it is sourced. Who siena fits. Larger DTC brands on Shopify with real ticket volume and a support budget that starts north of $1,000 a month. At that scale the math can work: $0.90 per automated ticket is cheap against the loaded cost of a human handling the same ticket, and the platform fee dilutes into the volume. Add the managed onboarding and the brand voice depth, and you can see who Siena built this for. If that is you, take the demo. It is a serious product. Who should skip it. Stores with a support budget under roughly $500 to $1,000 a month. The platform fee alone exceeds that budget before a single ticket is automated, and no discount call changes the shape of the model. WooCommerce stores. Siena is Shopify-first; third-party reviews list Shopify and Fulfil as the supported commerce platforms as of July 2026. If your store runs on WooCommerce, the actions that make Siena worth its price are not available to you. Teams that want to buy self-serve. There is no card checkout and no published final price. If you would rather test a product this afternoon than book a call this week, the sales-led motion itself is the filter, and it is filtering you out on purpose. Siena AI alternatives. Nousu compared seven tools with sourced pricing in its ecommerce AI comparison. The short version, for the buyer who got this far: Nousu (its product) is the flat-fee option. It resolves customer questions on Shopify and WooCommerce with real actions: live order status, returns, handoffs that carry full context. Pricing is a flat €29, €79, or €149 per month sized by conversation bundle, and going over a bundle never bills overage. Self-serve, free 14-day trial, details on its pricing page. If you were priced out of Siena or you run WooCommerce, this is the gap Nousu built for. Gorgias fits Shopify-first brands that want a full helpdesk with AI on top. Its AI Agent is billed per resolved conversation on top of per-ticket helpdesk plans (per gorgias.com, July 2026), so run your volume through the math before committing. Two meters at once adds up. Tidio (Lyro) fits small stores that mainly need answers, from $32.50 per month for 50 AI conversations (per tidio.com/pricing, July 2026). Know that Lyro answers questions; its published feature set does not cover refunds or order changes. Verdict. Siena is one of the strongest autonomous agents in ecommerce, and its pricing page tells you honestly who it is for: brands with the volume to dilute a $750 monthly fee and the patience for a sales cycle. If you fit that, shortlist it. If you do not, the money you would spend on the platform fee alone buys a year of a flat-fee agent. Compare the options with sources at its seven-tool comparison and check the numbers against your own queue.

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Dan Mihăescu este unul dintre partenerii fondatori ai GapMinder VC, unul dintre cele mai importante fonduri din România destinat susținerii startup-urilor la început de drum. Investește în tehnologii la început de drum și a făcut parte din tranzacții pentru FintechOS, TypingDNA, Druid sau Cartloop. În trecut a făcut parte din board-ul executiv Microsoft România, a condus GTS România, Bulgaria și Moldova și Business Development Director la UPC. Îmbină experiența anterioară în zona corporate cu susținerea companiilor la început de drum. În primăvara acestui an, echipa GapMinder a anunțat lansarea celui de-al doilea fond ce dispune de un capital total de 80 de milioane de euro. GapMinder este o companie de venture capital care investește în companii de tehnologie create în România și în Europa de Est (în special în Republica Moldova, Serbia, Croația, Slovenia și Bulgaria), care se dezvoltă rapid la nivel internațional și care se află în faza de Seed sau Late Seed

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