Custom eCommerce development services
SumatoSoft develops and improves eCommerce platforms for companies that prioritize stable growth and profitability. We handle the complexities: architecture, integrations, performance, security, and post-launch support. You get predictable deadlines and a transparent budget. We also get your store ready for how people, and their AI shopping agents, buy now.
Why choose SumatoSoft services
- We offer strong eCommerce expertise backed by successful projects.
- Since 2012, we’ve implemented over 350 solutions for Clients in 25+ countries.
- SumatoSoft is recognized as one of the top eCommerce developers in the US.
- 70% of our employees are senior-grade engineers.
- Techreviewer ratings note our experience in Shopify development and migrations.
- Our Clients include Toyota, Beiersdorf, Cornerstone OnDemand, Dexai Robotics, and other international companies.
- We work as a long-term technology partner for our Clients.
eCommerce development services
We cover six services most stores need, from the first build through the changes that follow launch. We scope each one against the cost of ownership over the three years after go-live.
Custom eCommerce development from scratch
When standard platforms are no longer sufficient, we do the following for you:
- Identify business goals, budget, time constraints, and the specifics of your market.
- Develop the catalog structure, shopping cart, promotional mechanics, taxes, shipping, and user roles on an architecture that leaves room for the product to grow.
We build headless storefronts when speed or flexibility earns back the extra work. That means a custom React or Vue frontend running against a separate commerce backend. You get faster pages and full control of the buying experience, and the systems that already handle your orders stay where they are.
Existing eCommerce solution audit
We analyze your current store or marketplace at every level: code, architecture, security, UX, and performance to:
- Identify bottlenecks, technical debt, security gaps, and crash risks.
- Prepare a report with specific recommendations and prioritization, including where it pays to fix a module and where it costs less to rewrite it.
An audit is also how a replatforming decision gets made. We compare the cost of improving what you have against the cost of migrating, and the report carries both numbers with the risks attached to each.
Mobile eCommerce applications
We develop mobile applications for iOS and Android for online stores and marketplaces that:
- Facilitate one-handed purchases, quick repeat orders, push notifications, and saved carts.
- Have integrations with your existing website or create a unified backend for all channels.
We support store releases and user behavior analytics.
Redesign and modernization of eCommerce platforms
We update legacy stores to improve conversion and assist marketing with:
- New UX logic for the catalog, filters, search, cards, cart, and checkout.
- Backend optimization and SEO protection: queries, cache, integrations, database operations, and the URL structure that carries your organic traffic.
A replatforming project is also the right moment to split off the frontend. We have moved a legacy store to headless commerce without touching checkout or payment flows. The risky parts of the system stayed as they were while the storefront improved.
eCommerce integrations with internal systems
We connect your online store with your internal systems, payment providers, and delivery services so data stays in sync:
- Synchronization of orders, inventory, prices, and delivery statuses.
- Integrations are made fault-tolerant, with logging and clear alerts.
- Backup scenarios in case of external service failures.
Support and development of eCommerce solutions
We provide post-release and post-migration support by:
- Fixing bugs and optimizing performance, then adding functionality in line with the agreed-upon backlog.
- Assisting marketing with A/B tests and other experiments, from promotional mechanics to new storefront options.
We work as a Dedicated Team or on a Time & Materials basis, with or without a cap. Compare the options on our engagement models page.
Platforms and technologies we work with
In almost every vendor evaluation, we encounter two terms: headless and composable when speaking about architecture. Headless means you separate the storefront from the commerce backend, then build a custom frontend against its APIs. Composable, often called MACH, goes further. It splits every layer into a service you pick on its own: search, cart, promotions, payments, and content.
We build headless storefronts on custom stacks and on Shopify, and we integrate commerce with enterprise systems. We don’t call ourselves a full composable systems integrator, because that would mean claiming platform ties we do not hold. If your roadmap needs a MACH rebuild, we’ll say so during the audit.
Custom eCommerce solutions
Shopify and Shopify Plus
More platforms and ecosystems
Custom eCommerce solutions
We build custom eCommerce solutions using Ruby on Rails, Node.js, React, Vue, and other modern stacks, choosing the right one for each task. A custom approach is justified when non-standard logic and complex integrations meet high loads. These stacks are also what a headless build runs on, so the storefront can be replaced later without a full rewrite. We carefully consider the cost of ownership to ensure the architecture is not overly complex.
Shopify and Shopify Plus
SumatoSoft is one of the top Shopify developers in the US and other regions, according to Techreviewer. We create custom themes, apps, integrations, and migrations from other platforms. Mid-market companies employ SumatoSoft to migrate to Shopify Plus without losing data or SEO. We also build Hydrogen and headless storefronts on Shopify when a themed store hits its limits. We set up payments, taxes, logistics, and reporting, taking into account business and market requirements.
More platforms and ecosystems
We work with BigCommerce and WooCommerce, along with a range of less common solutions. Our evaluations are always honest about when it makes sense to improve an existing platform and when it’s cheaper to migrate. We integrate eCommerce with Salesforce and other enterprise systems, and we review the overall integration architecture.
Types of eCommerce solutions we work with
The commerce model shapes the architecture more than the industry does. A wholesale portal and a consumer store share a catalog and little else. Below are the six models we build most often, each tied to projects we have delivered.
B2C online stores
Stores for brands and online retailers targeting consumers.
- We focus on search, filters, promotional features, checkout speed, and mobile experience.
- We take into account taxes and cross-state shipping, along with the specifics of each local market.
B2B portals and wholesale accounts
B2B portals for manufacturers and wholesale distributors.
- We implement account roles, order approvals, customized price lists, and catalogs.
- We develop pricing models, credit limits, payment terms, and interfaces that your managers can work in quickly.
Marketplaces for small and medium businesses
Marketplaces such as SellBig, a platform where small businesses sell within the US and internationally.
- We set up seller onboarding, moderation, storefronts, and sales analytics.
- We implement chat between sellers and buyers, returns, disputes, and reports for administrators.
- We provide a flexible, manageable catalog with banner areas.
- We give you SEO settings for categories and product cards.
eCommerce for food delivery and on-demand services
Sous Kitchen is an example of a home-cooked food service that we migrated to a new platform.
- We account for delivery zones and time slots, and we build around the kitchen’s schedule.
- We build routing, order statuses, notifications, and bonus programs.
- We create dashboards for the kitchen and the couriers.
- Support staff work from the same current order data.
eCommerce within content and service portals
Portals such as Hauz, an interior design website where users explore ideas and buy products immediately.
- We connect editorial content and the product catalog in one solution, with provider selection built in.
- Commerce becomes part of the ecosystem rather than a separate website.
Social commerce and mobile storefronts
Solutions that connect purchases and user social behavior.
- We add feeds, favorites, reviews, collections, and influencer and recommendation mechanics.
- We agree on which triggers and events analytics should track, and we establish a unified user profile across the website and the app from the start.
AI-era commerce: Agent-ready stores and AI features
How people shop is changing. AI shopping agents now find and compare products, and increasingly buy them on a shopper’s behalf. We get your store ready for that, and we build the AI commerce features you offer your own customers.
Everything that touches a transaction runs under our Agentic Software Development Lifecycle (ADLC).
Agent-ready commerce
We make your store discoverable and transactable by AI shopping agents in ChatGPT, Google AI Mode and Gemini, Perplexity, Copilot, and Amazon. Most of this work happens in your data layer. A store can look fine to a shopper and stay invisible to an agent.
AI merchandising and search
Recommendation engines, semantic and visual search, personalized storefronts, dynamic pricing rules, and AI-generated product content. These features move the conversion rate and average order value. They run on the catalog data you already have.
AI shopping assistants and support
We build chat assistants that read your own catalog and policies, so their answers stay grounded in your data. We also build automated support, returns handling, demand forecasting, stock planning, and agent-fraud detection.
How we keep it safe
The essential part of agentic commerce is trust. An agent that can spend money can also be manipulated, and one bad order costs you a customer. We govern every money-moving agent with our ADLC: evaluation against intent, guardrails, controlled rollout, and human-in-the-loop approval for transactions.
The same lifecycle applies whether the agent is yours or someone else’s. An agent that reaches your catalog through an MCP server gets scoped permissions and rate limits, plus an audit trail of what it reads and what it buys.
Why merchants are moving nowaluation
Adobe Analytics reported that in May 2026, AI-referred visitors to US retail sites converted 54% better than visitors from other channels, reversing the gap it had measured a year earlier. Shopify told investors in February 2026 that orders reaching its merchants from AI search had grown fifteenfold since January 2025. McKinsey estimated in October 2025 that agentic commerce could mediate $3 trillion to $5 trillion of global consumer spending by 2030.
Recent software we made
I was impressed by SumatoSoft’s prices, especially for the project I wanted to do and in comparison to the quotes I received from a lot of other companies.
Also, their communication skills were great; it never felt like a long-distance project. It felt like SumatoSoft was working next door because their project manager was always keeping me updated. Initially.
We tried another company that one of our partners had used but they didn’t work out. I feel that SumatoSoft does a better investigation of what we’re asking for. They tell us how they plan to do a task and ask if that works for us. We chose them because their method worked with us.
Together with the team, we have turned the MVP version of the service into a modern full-featured platform for online marketers. We are very satisfied with the work the SumatoSoft team has performed, and we would like to highlight the high level of technical expertise, coherence and efficiency of communication and flexibility in work.
We can confidently say that SumatoSoft has put all our ideas into practice.
Rivalfox had the pleasure to work with SumatoSoft in building out core portions of our product, and the results really couldn’t have been better.
SumatoSoft provided us with engineering expertise, enthusiasm and great people that were focused on creating quality features quickly.
From the early stages of the project, SumatoSoft demonstrated a proactive attitude, actively seeking opportunities to enhance the solution and anticipate our needs. They consistently took the initiative to address any potential issues, provide timely updates, and offer solutions to challenges that arose during development. This proactiveness greatly contributed to the project’s success and exceeded our expectations.
Working with SumatoSoft has been an outstanding experience. Their team is not only highly skilled but also incredibly responsive, collaborative, and committed to delivering quality results. I can’t recommend them enough! Thank you team SumatoSoft for bringing my vision to life.
SumatoSoft is flexible, efficient, and extremely good at planning and being proactive. They have also been very proactive in their approach throughout the project, seeking to understand the needs and the reasons behind them before launching into development, which has been helpful for maintaining direction and consistency, especially because the end client is regularly generating new ideas for added features.
Request a cost estimate
Receive a detailed proposal for your custom eCommerce solution.
Custom eCommerce development process
We design and develop thoroughly tested eCommerce websites with customer-centered UX and UI, built to turn visitors into buyers. We scope agent-readiness and AI features in stages 2 and 4, with the rest of the architecture.
- Analysis of stakeholders’ needs and of key eCommerce competitors
- Market and customer research for your niche
- Product vision
- Software requirements specification (SRS)
- Project roadmap
- High-level eCommerce architecture design, including agent-readiness and AI scope
- Interactive eCommerce prototype
- User journey mapping
- UI design and motion basics (animations, micro-interactions)
- Defining the visual style and tone of the website
- Design reviews and feedback from stakeholders
- Backend development
- Frontend development
- Performance optimization
- Integration of APIs and payment providers
- Functional testing
- Non-functional testing (performance, security, usability)
- Regression testing
- Bug tracking and fixes
- Hosting setup and configuration
- Migration from staging to production, then a final round of testing in production-like conditions
- Changes and improvements to existing features, plus design and development of new ones
- Management of library and framework updates
Cost factors of custom eCommerce software
The cost of eCommerce website development depends on the project scope, the technology choices, the integrations, and your business goals. Simple stores start at $25,000, and complex marketplaces exceed $1,000,000, so the range only helps once you know which of the five factors apply to you. These move the budget the most.
Contract shape affects the number, too. We work on Fixed Price, Time & Materials, T&M with a cap, or as a Dedicated Team. Compare them on our engagement models page.
Target audience
Solution type
Locations
Scope
Target platforms
Awards & Recognitions
Frequently asked questions
How much does it cost to develop a turnkey eCommerce website or online store?
Simple online stores typically start at $25,000. Complex marketplaces and B2B portals can exceed $1,000,000. We provide a precise estimate after a free assessment of project requirements. The price of eCommerce website development depends on the scope, the integrations, the design, and the platforms you target.
How long does it take to develop an eCommerce project from concept to launch?
An online store MVP typically takes three to five months. Large marketplaces with B2B logic can take a year or longer to develop. We provide an approximate timeline for each stage during the pre-sale. The timeframe depends on the scope of features and design, as well as the number of system integrations.
Which eCommerce platforms do you work with: Shopify, WooCommerce, or a custom stack?
We work with Shopify, WooCommerce, BigCommerce, and custom solutions. We help you choose the right platform for your budget, your expected workload, your integrations, and your process requirements. If needed, we can offer a custom architecture instead of a ready-made platform, including a headless setup where the storefront runs separately from the commerce backend.
Can you migrate an existing online store to another eCommerce platform?
Yes, we migrate online stores and marketplaces. We transfer customer data, orders, products, and content, and we preserve the URL structure, SEO settings, order history, and category structure. We evaluate the migration plan and the downtime in advance, before work begins.
How do you ensure data and online payment security in your online store?
We are ISO 9001 and ISO 27001 certified and adhere to these standards. We use secure coding, data encryption, access control, and regular audits. When working with payments, we take PCI DSS requirements and local laws into account.
Let’s start
If you have any questions, email us info@sumatosoft.com
