SaaS development services
Senior LATAM engineers who join your sprint on your hours to build, re-architect and scale multi-tenant products, from the first version to the one your enterprise customers audit.
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15+years delivering software
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100+senior engineers across LATAM
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6-8hdaily overlap with US teams
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6+Fortune 500 & global brands trust us
The engineering a subscription product runs on
A SaaS product does not usually break on features. It breaks on the decisions underneath: a tenancy model chosen in week three, a billing flow bolted on after the first enterprise deal, an infrastructure bill that grows faster than revenue.
FusionHit works on those. Senior engineers across Latin America join your existing team and your existing repo, on US Central and Eastern hours, so code review, planning and incident response happen inside your working day instead of the next one.
\ What we build for SaaS companies
The work software companies bring us most often, whether the product is still an idea or already carrying customers.
New products and MVPs
A first version scoped to what the market has to see, on an architecture that can grow instead of being rebuilt next year.
Multi-tenant architecture
Tenant model, isolation, provisioning and the per-tenant configuration your sales team keeps promising.
Single-tenant to multi-tenant migration
Moving a product that grew one customer at a time onto one platform, in waves, without downtime for anybody.
Platform re-architecture and scale
The work behind a product that outgrew its first design: services, queues, caching and the infrastructure bill.
Subscription billing and metering
Plans, entitlements, usage metering, proration and the migrations between pricing models nobody plans for.
Integrations, APIs and webhooks
The public API, the webhooks and the integrations your customers ask for during the sales cycle.
AI features inside your product
Assistants, search and automation built on your tenants' data, with isolation and inference cost handled up front.
Security work for enterprise deals
The logging, access reviews and controls your SOC 2 auditor and your customers' security questionnaires ask for.
The software companies we work with
Different stages, different problems. These are the ones our engineers already know how to work with.
Seed and Series A startups
A small team that needs senior capacity to ship the next version without hiring for a year.
Scaling B2B SaaS
A product with customers, a backlog that keeps growing and an architecture that is starting to show its age.
ISVs with a legacy product
An installed product that has to become a platform before the renewals get harder.
Enterprise software teams
An internal product org that needs a team to own a workstream end to end.
Vertical SaaS
Software for one industry, where the compliance and integration work is half the roadmap.
PE-backed portfolio companies
A product that has to hit margin and roadmap targets on a schedule somebody else set.
Choosing a multi-tenancy model
Every vendor says they build multi-tenant software. Almost none of them tells you which model they mean, or what it will cost you later. This is the conversation we have in discovery.
Most B2B products, especially self-serve, where tenants are small and the feature set is the same for everyone.
Every query needs a tenant filter and every bug is a potential data leak. Noisy neighbours are your problem to solve. Per-tenant restore is hard.
A few hundred tenants at most, with some per-tenant customization and clean per-tenant backups.
Migrations run per schema and get slower as you grow. Connection and tooling limits arrive earlier than you expect.
Enterprise customers that require data separation in writing, or regulated data with residency rules.
Higher fixed cost per tenant and real operational work: migrations, monitoring and upgrades across many databases.
A handful of very large customers who require their own environment, sometimes in their own cloud account.
This is the most expensive model to run and the hardest to keep consistent. It should be a priced tier, not a default.
Most products past their first enterprise deal: pooled tenants on the standard plan, isolated tenants on the top plan.
Complexity moves into provisioning and release. It only works if the code stays identical and only the deployment differs.
One database, one schema, shared by all tenants
One database, a schema per tenant
A database per tenant
A deployment per tenant
A mix
How we start on an existing product
What it takes, by the work you need
Vendors answer this with 'it depends'. Here is what it depends on, by the kind of work, so you arrive at the first call knowing what to expect.
3-5 months
The scope you can launch with, tenancy and billing from day one, and how much of the product the first customers really need.
2-3 months
Tenant model, provisioning and onboarding, roles and permissions, and whether SSO is needed at launch.
6-12 months
Number of customers and how far their versions have diverged, data model changes, and how many waves the cutover needs.
2-4 months
Pricing model, usage metering, proration and plan changes, and migrating customers who are on legacy pricing.
4-8 months
What has to be split out, data migration, and how much of it can ship behind a flag while the product keeps running.
2-4 months
The controls you are missing in the product: logging, access reviews, change records and evidence collection.
MVP of a new SaaS product
Multi-tenant foundation on a new product
Single-tenant to multi-tenant migration
Subscription billing and metering
Platform re-architecture for scale
SOC 2 readiness engineering
Why software companies build with FusionHit
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Real-time collaboration
Engineers on US Central and Eastern time, so code review, planning and incidents happen inside your working day rather than overnight.
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We join your team, not a parallel one
Your repo, your review rules, your standup and your definition of done. You keep the roadmap and the release decisions.
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Senior engineering talent
Vetted nearshore engineers with production experience in multi-tenant products and modern stacks.
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Hand-over written into the agreement
Code, documentation and environments stay under your organization, and the exit terms are in the contract from the start.
Platforms we have helped build and scale
AI-Augmented Development and Operations in a Multi-Team Enterprise
Challenge Multiple engineering teams working across Supply Chain and Support Services were operating in silos, each dealing independently with challenges around…
Embedding AI Across the Full Engineering Lifecycle
Challenge A product engineering team was managing growing codebases with increasing complexity around quality control, documentation, and cloud infrastructure. Code reviews…
Closing the Mobile Platform Gap Through AI-Accelerated Development
Challenge A mobile product team was running two parallel codebases — iOS and Android — but iOS development was consistently falling…
Three ways to work with us
Pick the model that fits how your team runs. Plenty of clients start with one and move to another as the roadmap grows.
Staff augmentation
Senior engineers added to your existing team, under your direction. Best when you have a technical lead and need capacity or a specific skill.
Dedicated development teams
A stable team that works only on your product, with a lead on our side. Best when you want a whole workstream owned without hiring a manager for it.
Software development outsourcing
A defined scope delivered end to end under our management, for a fixed price and date. Best when the scope is clear and you want one number and one date.
Stacks our SaaS teams work in
The technologies behind the products we build and scale.
Other industries we build for
Vertical SaaS lives under someone else's rules. These are the ones our engineers already work in.
Fintech
Payments, lending, banking and wealth platforms built inside your compliance perimeter.
Healthcare
Clinical, patient and revenue systems built around HIPAA and the workflows clinicians use.
Insurance
Policy, quoting and claims platforms for carriers, MGAs and brokers.
Logistics
Systems that run around the clock, from warehouse to last mile.
Retail
Commerce and store platforms sized for a peak season before it arrives.
Manufacturing
Plant, quality and supply systems that integrate with equipment nobody wants to touch.
FAQs about our SaaS development services
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How much does SaaS development cost?
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How long does it take to build a SaaS MVP?
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Which multi-tenancy model should we use?
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Can you migrate our product from single-tenant to multi-tenant?
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How do you work with our existing engineering team?
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Can you help us get SOC 2 ready?
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Do you work on subscription billing and usage-based pricing?
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Who owns the code and the intellectual property?
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What happens if we want to take the work back in-house?
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Do we hire your engineers or do you deliver the project?
Ready to put senior engineers on your product?
Tell us where the product is today and what has to happen next, and we will come back with a plan.
Trusted by leading teams
Rated by our clients
