Flexible and client-oriented engagement models
Choose the engagement model that fits your project shape and engage SumatoSoft to build it: Time and Materials, Time and Materials with a cap, Fixed Price, or a Dedicated Team.
Each model defines how the scope, budget, and team evolve throughout the project.
Since 2012, we’ve delivered custom software from Boston and Warsaw.
Why the engagement model matters
Software development engagement models fall into two broad categories: fixed-scope contracts (Fixed Price) and flexible-scope contracts (Time and Materials, Time and Materials with a cap, and Dedicated Team).
The right fit depends on how clearly your scope is defined, how much budget flexibility you have, how long the engagement will run, and whether your project involves AI components. Pick the wrong one, and you pay for it in change orders, stalled sprints, or a budget you cannot move where the work actually is.
Build in-house, hire freelancers, or outsource
Before choosing a contract model, most buyers are deciding how to staff the work at all. Outsourcing carries a real premium over a freelance rate, and what you buy with it is a team that stays, a process that holds, and accountability for the result rather than for individual tasks. The honest trade-offs:
Build in-house
Hire freelancers or marketplaces
Outsource to SumatoSoft
Build in-house
Full control and the highest retention of knowledge. You carry the hiring risk, a capacity ceiling, and three to six months to bring on a senior engineer. Long-term cost includes management overhead.
Hire freelancers or marketplaces
Lower hourly rate. Quality varies, coordination falls to you, and there is no guarantee of continuity or built-in team structure.
Outsource to SumatoSoft
Process and team continuity with a cross-functional team built around your project. You pay a premium over freelance rates, and in return, you get senior-led delivery and partnerships that commonly run for years. With 70% of our engineers at the senior level, the people making architecture decisions are the ones doing the work.
Time and Materials
In the Time and Materials model, you pay for the hours worked at an agreed hourly rate. Scope and budget stay flexible while the rate stays fixed in the contract. Our project managers track effort weekly and forecast cost at every stage, so flexibility does not mean losing sight of the total.
How it works
You pay for actual hours at the agreed rate, invoiced monthly, with detailed timesheets and a sprint demo each cycle.
When it fits best
Evolving scope, product development with feature iteration, and projects where discovery continues as you build.
Business benefits
Maximum flexibility, no penalty for changing direction, transparent reporting, and a quick start with little upfront planning.
Risk allocation
We carry delivery and quality risk. You carry scope and budget risk. Timeline risk is shared.
Typical project size
$50K to $500K, lasting 3 to 18 months, with a team of 2 to 8.
Team composition
Cross-functional: a project manager plus 2 to 5 developers and QA, with roles flexing as the scope evolves.
SDLC and ADLC fit
Strong for traditional software. Strong for AI work such as LLM integration, RAG, and iterative model refinement. ADLC is the Agentic Development Lifecycle, our process for building governed AI systems.
Time and Materials with a cap
Time and Materials with a cap retains the flexibility of Time and Materials while adding a guaranteed ceiling on total spend. You still pay for hours and resources, and the contract sets a not-to-exceed limit. The budget is fixed while the scope stays open, which is why it is the model most mid-size projects settle on.
How it works
Time-and-materials billing with a pre-agreed ceiling. Above the ceiling, we absorb the additional hours, or we renegotiate the scope with you first.
When it fits best
Mid-size projects with a firm budget and AI MVPs, where the exact scope cannot be fixed, but the budget can.
Business benefits
Budget protection plus flexibility, and an incentive for us to spend the scope efficiently.
Risk allocation
Scope risk is shared. Your budget is capped. We carry the risk of overruns beyond the cap.
Typical project size
$100K to $300K, lasting 3 to 9 months, with a team of 3 to 6.
Team composition
Cross-functional, with project management tuned to keep the work inside the cap.
SDLC and ADLC fit
Strong for traditional software. Strongest for AI MVPs, where it is our primary recommendation.
Fixed Price
In a Fixed Price engagement, the scope, schedule, and budget are agreed upon up front and frozen. The price is based on a detailed specification, payments follow defined milestones, and any change runs through a formal change order. We finalize requirements in a discovery phase before the price is set.
How it works
A pre-agreed total price for a well-defined scope, with milestone-based payments and change orders for anything new.
When it fits best
Tightly scoped projects, MVPs with locked specifications, proofs of concept, and fixed-functionality builds that run under a few months.
Business benefits
Budget certainty, clear deliverables, and minimal management overhead once development starts.
Risk allocation
We carry scope, timeline, and budget risk. You carry the risk that the requirements were clear enough at the start.
Typical project size
$30K to $150K, lasting 2 to 6 months, with a team of 2 to 4.
Team composition
Lean: a project manager plus 2 to 3 specialists tied to the deliverables.
SDLC and ADLC fit
Strong for traditional software. Limited for AI, suitable only for bounded proofs of concept with explicit evaluation criteria, and discouraged for production AI systems.
Dedicated Team
In the Dedicated Team model, we assemble a cross-functional team that works only on your product and integrates with your in-house engineering. You bill monthly per team member, you set product direction, and the team builds deep knowledge of your system over time.
How it works
A dedicated cross-functional team integrated with your engineers, billed monthly per member.
When it fits best
Long-term product development of six months or more, ongoing platforms, and multi-year engagements.
Business benefits
Continuity of knowledge, dedicated focus, and a team that builds product expertise and scales with you.
Risk allocation
Shared. We manage the team. You provide product direction.
Typical project size
$200K to $2M+ per year, typically 12 months or longer, with a team of 4 to 15.
Team composition
Cross-functional: a project manager plus 3 to 12 developers, QA, DevOps, and a designer as needed. Unlike pure staff augmentation, which supplies individual contributors only, a Dedicated Team includes its own project manager and cross-functional roles.
Replacement guarantee
If a team member is not the right fit within the first 7 days, we replace them at no additional cost.
SDLC and ADLC fit
Strong for traditional software. Strongest for ongoing AI products that need model maintenance and retraining.
Compare the four models
The table sets the four models side by side on the factors buyers weigh most. Column order matches the rest of the page: Time and Materials, Time and Materials with a cap, Fixed Price, Dedicated Team.
| Factor | Fixed Price | Time and Materials | T&M with a cap | Dedicated Team |
|---|---|---|---|---|
Scope |
Flexible |
Flexible |
Flexible |
Flexible |
Budget |
Variable |
Capped |
Fixed |
Monthly per member |
Best for |
Evolving products |
Mid-size, firm budget |
Bounded, specified work |
Long-term ownership |
Typical size |
$50K – $500K |
$100K – $300K |
$30K – $150K |
$200K – $2M+/yr |
Typical duration |
3 – 18 months |
3 – 9 months |
2 – 6 months |
12 months+ |
Who manages the team |
SumatoSoft |
SumatoSoft |
SumatoSoft |
Client direction, SumatoSoft delivery |
SDLC project fit |
Strong |
Strong |
Strong |
Strong |
ADLC (AI) project fit |
Strong |
Strongest |
Limited, bounded PoCs only |
Strongest for ongoing |
Scope
Budget
Best for
Typical size
Typical duration
Who manages the team
SDLC project fit
ADLC (AI) project fit
Flexible
Variable
Evolving products
$50K – $500K
3 – 18 months
SumatoSoft
Strong
Strong
Flexible
Capped
Mid-size, firm budget
$100K – $300K
3 – 9 months
SumatoSoft
Strong
Strongest
Flexible
Fixed
Bounded, specified work
$30K – $150K
2 – 6 months
SumatoSoft
Strong
Limited, bounded PoCs only
Flexible
Monthly per member
Long-term ownership
$200K – $2M+/yr
12 months+
Client direction, SumatoSoft delivery
Strong
Strongest for ongoing
 Engagement models for AI projects
AI projects behave differently from traditional builds, so the engagement model has to behave differently, too. Traditional software follows the SDLC, where requirements can be specified, and a fixed price can be held. AI work follows the ADLC, the Agentic Development Lifecycle, where model performance is discovered through evaluation rather than declared upfront. That difference changes which model fits.
For AI work, Time and Materials with a cap is the primary recommendation: it protects the budget while leaving room for the empirical loop of testing, measuring, and refining. Fixed Price is discouraged for production AI because no specification can promise a quality bar that only evaluation can establish. A Dedicated Team becomes the strongest fit once an AI product is live and needs ongoing model maintenance and retraining. A common path runs through three phases: a Fixed Price discovery to define the problem, a Time and Materials with a cap MVP to build and evaluate, then a Dedicated Team for production and ongoing model care.
The fit also depends on the kind of AI you are building:
- LLM integration
Time and Materials or Time and Materials with a cap. Scope firms up quickly once prompts and guardrails are set.
- RAG systems
Time and Materials with a cap. Retrieval quality is tuned empirically against your data.
- Custom ML models
Time and Materials with a cap. Performance depends on data and iteration, not on a spec.
- AI agents
Time and Materials with a cap, moving to a Dedicated Team for production. Agent behavior needs governance and continuous evaluation.
- AI proof of concept
Fixed Price is acceptable when the evaluation criteria are explicit and the scope is bounded.
Talk through your options
Not sure which model fits your project? Talk to our engagement specialist for a recommendation based on your scope, budget, and timeline.
Which model each industry tends to use
Patterns vary by industry because compliance load, scope stability, and engagement length vary. The matrix shows the model most Clients in each industry start with and the alternative they switch to when the situation calls for it.
| Industry | Common model | Why | Alternative | When the alternative applies |
|---|---|---|---|---|
Healthcare |
Dedicated Team |
Continuity for compliance |
T&M with a cap |
Initial MVP or pilot |
Fintech |
T&M with a cap |
Regulated features keep evolving |
Fixed Price |
Specific compliance modules |
Logistics and IoT |
Dedicated Team |
Multi-year platforms |
Time and Materials |
New integrations or experiments |
Startups and MVPs |
T&M with a cap |
Budget protection is critical |
Fixed Price |
Bounded feasibility build |
Enterprise modernization |
Dedicated Team |
Long-term ownership |
Mixed |
Phased, with a Fixed Price discovery |
AI and ADLC |
T&M with a cap |
Model performance is empirical |
Dedicated Team |
Ongoing production with retraining |
Healthcare
Fintech
Logistics and IoT
Startups and MVPs
Enterprise modernization
AI and ADLC
Dedicated Team
T&M with a cap
Dedicated Team
T&M with a cap
Dedicated Team
T&M with a cap
Continuity for compliance
Regulated features keep evolving
Multi-year platforms
Budget protection is critical
Long-term ownership
Model performance is empirical
T&M with a cap
Fixed Price
Time and Materials
Fixed Price
Mixed
Dedicated Team
Initial MVP or pilot
Specific compliance modules
New integrations or experiments
Bounded feasibility build
Phased, with a Fixed Price discovery
Ongoing production with retraining
Switching and combining models
You are not locked into one model for the life of an engagement. Most long projects move between models as the work changes, and we structure contracts to allow it.
Switching mid-engagement
A common pattern runs Fixed Price discovery, then a Time and Materials with a cap MVP, then a Dedicated Team for production.
Running models in parallel
A Dedicated Team can own the core platform while a Fixed Price contract delivers a specific, well-scoped feature alongside it.
AI phasing
AI products typically start capped during the empirical build phase and move to a Dedicated Team once the system is in production and needs retraining.
Who carries which risk
Procurement reviews think in risk, so here is exactly who carries what under each model. This is the same allocation written into our contracts.
| Risk type | Fixed Price | Time and Materials | T&M with a cap | Dedicated Team |
|---|---|---|---|---|
Scope creep |
SumatoSoft |
Client |
Shared |
Client |
Budget overrun |
SumatoSoft |
Client |
Client, capped |
Client |
Timeline slip |
SumatoSoft |
Shared |
Shared |
Shared |
Quality and defects |
SumatoSoft |
SumatoSoft |
SumatoSoft |
SumatoSoft |
Scope creep
Budget overrun
Timeline slip
Quality and defects
SumatoSoft
SumatoSoft
SumatoSoft
SumatoSoft
Client
Client
Shared
SumatoSoft
Shared
Client, capped
Shared
SumatoSoft
Client
Client
Shared
SumatoSoft
How contracting works
The path from first conversation to first sprint is short and predictable. Each step has a clear owner and a clear artifact, and the list continues into the specific terms a procurement review tends to ask about: insurance, liability, subcontracting, termination, and due diligence.
We sign within 24 hours after your request, so technical discussion can start quickly.
Two to four weeks for Fixed Price and Time and Materials with a cap on engagements, and we can bypass it for established Clients.
The MSA sets the overall terms, governed under Massachusetts law.
The SOW fixes scope, timeline, and budget for the specific project.
The team starts with the first sprint demo within 2 weeks of kickoff.
Negotiated per SOW.
Standard 30-day notice. IP transfers on full payment per the SOW, and handover includes documentation, deployment scripts, and a knowledge-transfer session.
A pre-packaged due diligence response is available on NDA, including insurance certificates, security certifications, and a sample MSA template.
How we run projects
Once the team starts, delivery runs on a fixed operating rhythm. These are the elements that keep an engagement visible and predictable.
Communication
Slack or Teams for daily contact, Jira for tracking, Confluence for documentation, and Zoom for demos and reviews.
Knowledge transfer
Documentation lives in Confluence, with a knowledge-transfer session at the end of the engagement.
Reporting
Weekly status, a sprint demo every cycle, and a monthly executive summary.
Service levels
We respond within 1 business day during the overlap window.
Escalation
A defined path from project manager to engineering lead to account director.
Project management
A dedicated project manager on larger engagements, and a shared one below that threshold.
Time to first value
The first sprint demo lands within 2 weeks of kickoff.
Communication
Slack or Teams for daily contact, Jira for tracking, Confluence for documentation, and Zoom for demos and reviews.
Knowledge transfer
Documentation lives in Confluence, with a knowledge-transfer session at the end of the engagement.
Reporting
Weekly status, a sprint demo every cycle, and a monthly executive summary.
Service levels
We respond within 1 business day during the overlap window.
Escalation
A defined path from project manager to engineering lead to account director.
Project management
A dedicated project manager on larger engagements, and a shared one below that threshold.
Time to first value
The first sprint demo lands within 2 weeks of kickoff.
Our recent works
The system has produced a significant competitive advantage in the industry thanks to SumatoSoft’s well-thought opinions.
They shouldered the burden of constantly updating a project management tool with a high level of detail and were committed to producing the best possible solution.
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.
SumatoSoft is the firm to work with if you want to keep up to high standards. The professional workflows they stick to result in exceptional quality.
Important, they help you think with the business logic of your application and they don’t blindly follow what you are saying. Which is super important. Overall, great skills, good communication, and happy with the results so far.
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.
SumatoSoft succeeded in building a more manageable solution that is much easier to maintain.
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.
We are absolutely convinced that cooperation between companies is only successful when based on effective teamwork (and Captain Obvious is on our side!). But the teams may vary on the degree of their cohesion.
They are very sharp and have a high-quality team. I expect quality from people, and they have the kind of team I can work with. They were upfront about everything that needed to be done.
I appreciated that the cost of the project turned out to be smaller than what we expected because they made some very good suggestions. They are very pleasant to work with.
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.
We brought in SumatoSoft to help us reduce unexpected turbine failures, and the result met our expectations.
Thanks to SumatoSoft’s can-do attitude, amazing work ethic, and willingness to tackle clients’ problems as their own, they’ve become an integral part of our team. We’ve been truly impressed with their professionalism and performance and continue to work with the team on developing new applications.
We are completely satisfied with the results of our cooperation and will be happy to recommend SumatoSoft as a reliable and competent partner for development of web-based solutions
We’ve been working with SumatoSoft for a few years, starting from the initial monitoring system, so they already understood our environment quite well. At the same time, they still managed to surprise us with their professionalism.
Why SumatoSoft for the engagement itself
Beyond the build, these are the things that make the engagement safe to sign.
Reference calls
Vendor due diligence packet
Repeat business
Fast NDA
Replacement guarantee
Operational stack
Awards & Recognitions
Frequently asked questions
How do I choose between Fixed Price, Time and Materials, Time and Materials with a cap, and a Dedicated Team?
Match the model to your scope clarity, budget flexibility, and timeline. Fixed Price suits bounded, well-specified work; Time and Materials suits evolving scope; Time and Materials with a cap suits flexible scope on a firm budget; a Dedicated Team suits long-term ownership.
What is the difference between Time and Materials and Time and Materials with a cap?
Both bills for actual hours worked. Time and Materials with a cap adds a not-to-exceed ceiling, so you keep the flexibility while your total spend stays protected.
What is the minimum engagement duration for each model?
Fixed Price projects run for about 2 months, Time and Materials and the capped variant for about 3 months, and a Dedicated Team is built for 6 months or more. Our minimum project size is $25K.
Can we start with one model and switch to another mid-project?
Yes. A common path is a Fixed Price discovery, then a Time and Materials with a cap MVP, then a Dedicated Team for production. Contracts are structured to allow the move.
What are your typical hourly rates?
Rates fall in the $50 to $99 per hour range, depending on role and seniority.
Let’s start
If you have any questions, email us info@sumatosoft.com
