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ExtensionEngine

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4.6/5 (8 reviews)
+18888222516 info@extensionengine.com Visit Website

About ExtensionEngine

It has been developing web and mobile software solutions for some of the world’s most powerful companies since 2000. They try to assure that their clients are informed of what is now possible and put them in a position to take complete advantage of the tools and technologies available. They are always dedicated to helping them achieve that. It is one of the best mobile app development company in Boston.

Last updated May 13, 2026

Services

Mobile App Development Web Development UI-UX Design Custom Software Development Web Design

Industries Served

Automotive Energy & Utilities Pharmaceuticals & Biotechnology Construction Aerospace & Defense Sports & Fitness

ExtensionEngine Reviews

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Gameplay feel that matched the design intent precisely — a harder achievement than most realise

Matthieu Renard / Directeur Technique - Lumière Technologies SAS
Verified
Mar 31, 2026

Project summary: Our field service management system had not been updated significantly in six years. Rising technician count and increasing job complexity had exposed every one of its limitations.

The thing that retrospectively seems most significant is how little drama there was. Complex technology projects tend to accumulate incidents, escalations, and tense conversations. This one did not. Problems were surfaced before they became incidents. Scope changes were handled with process rather than conflict. Risks were managed rather than avoided. That level of maturity is rare in my experience and it made the delivery feel almost effortless from our side, which I know it was not from theirs.

PROS

Delivery timeline that proved achievable rather than optimistic, estimation accuracy that reflected real analysis rather than competitive bidding, scope discipline that prevented the feature creep we had experienced before

CONS

Time zone coordination required some deliberate overlap management from both sides in the first couple of sprints, after which we had an efficient async rhythm that worked for the whole project

4.5
Overall
5.0
Quality
5.0
Schedule
4.0
Cost
5.0
Communication
Project TypeGame Development
IndustryEnergy & Utilities
Project Cost$50,000 to $149,999
DurationJul 2025 – Dec 2025

Questions & Answers

Please describe your company, your role, and the industry you operate in.
Lumière Technologies SAS operates in the Energy & Utilities sector with headquarters in Paris, France. In my role as Directeur Technique I am accountable for the full technology agenda — infrastructure, product, and vendor relationships. We are a commercially driven organisation and every technology decision is evaluated against a clear business case before it is approved.
What specific problem or business challenge led you to hire this company?
The immediate problem was that our Game Development capability had become the bottleneck limiting our ability to grow. Every feature request, every new client requirement, every internal initiative was delayed by a platform that had been extended beyond its original design. We needed a rebuild, not a patch.
What services did the company provide for your project?
The core engagement was Game Development delivery, though their scope expanded to include technical consultancy during discovery that materially improved our requirements. They also took ownership of the third-party integration workstream that had been a coordination challenge in previous projects, removing that complexity from our internal team entirely.
Why did you choose this company over other providers you considered?
We ran a structured shortlisting process across five vendors. The technical evaluation eliminated two immediately. Of the remaining three, this team's proposal was differentiated by the specificity of their Game Development approach and the evidence base they provided — reference projects in Energy & Utilities contexts, not generic case studies. The reference calls confirmed a track record that the proposal had described accurately.
How clearly did the company understand your requirements and business goals?
Thoroughly and precisely. The requirements document they produced was detailed enough that our QA team used it directly to write acceptance criteria. Every user story had a defined business objective attached. Nothing was left to interpretation. That discipline in the requirements phase paid dividends throughout development and testing.
How was your overall experience with their communication and project management?
Outstanding. The discipline around asynchronous communication was particularly effective given the time zones involved between Paris, France and the delivery team. Written updates were specific and consistent, response times were same-day for anything that required a decision, and nothing fell through the cracks across a six-month engagement.
Did the company deliver the project on time and within your expected budget?
Yes to both. There was a single sprint where a dependency on a third-party API introduced a one-week delay. The team identified it three weeks in advance, presented two mitigation options, and we agreed on an approach that recovered the schedule within the same sprint cycle. That level of foresight is what separates good project management from reactive problem management.
What tangible results or business impact have you seen since the project was completed?
The most direct measure is the performance of the system in production. In the five months since go-live we have had zero P1 incidents, our page performance scores have improved across every Core Web Vitals metric, and two enterprise clients who had cited our previous platform limitations during contract negotiations have since renewed without that objection arising.
What did you like most about working with this company?
The continuity of the team. The engineers who participated in the discovery sessions were the engineers who built the system. That consistency of institutional knowledge across a six-month project has a value that is difficult to quantify but easy to notice when it is absent. Every conversation built on the previous ones.
Would you recommend this company to others, and would you work with them again?
Yes, without reservation. I have already made two direct referrals within my Energy & Utilities network — in both cases to peers facing Game Development challenges similar to ours. I gave those referrals with confidence because I knew the experience I described was reproducible, not the result of exceptional circumstances on our engagement.

A technology investment that delivered returns ahead of the business case we approved

Abdullah Al-Shehri / Head of Innovation - Desert Tech Ventures
Verified
Jan 26, 2026

Project summary: The transition to EV had created demand for dealer network management capabilities our existing system was not designed to support. A targeted rebuild was the agreed path forward.

The technical quality of the final deliverable is the easiest thing to point to. The automated test coverage is thorough, the deployment pipeline is reliable, the documentation is genuinely useful rather than ceremonially produced. But the metric I keep returning to is the number of post-launch conversations we have not had to have. No incident calls at two in the morning. No emergency patches. No retrospective discussions about what went wrong. The absence of those events is the evidence I would show to someone considering this vendor.

PROS

Collaborative culture that made the team feel like a genuine extension of our organisation, strong asynchronous communication across time zones, zero-drama handling of the inevitable mid-project changes

CONS

Their discovery process is more rigorous than we were accustomed to and required more preparation from our side than we had initially allocated — but the quality of what followed justified every hour of it

4.5
Overall
4.0
Quality
5.0
Schedule
4.0
Cost
5.0
Communication
Project TypeIndustry-Specific Solutions
IndustryAutomotive
Project Cost$150,000 to $499,999
DurationMay 2025 – Dec 2025

Questions & Answers

Please describe your company, your role, and the industry you operate in.
I lead technology at Desert Tech Ventures, a growth-stage Automotive business based in Riyadh, Saudi Arabia. As Head of Innovation my remit spans product engineering, platform operations, and strategic vendor partnerships. We had reached an inflection point where our internal capacity was not sufficient to execute our roadmap at the pace our market required.
What specific problem or business challenge led you to hire this company?
The immediate problem was that our Industry-Specific Solutions capability had become the bottleneck limiting our ability to grow. Every feature request, every new client requirement, every internal initiative was delayed by a platform that had been extended beyond its original design. We needed a rebuild, not a patch.
What services did the company provide for your project?
The scope covered the full Industry-Specific Solutions lifecycle: discovery and requirements definition, solution architecture, iterative development across twelve sprints, integration testing, performance validation, production deployment, and a structured four-week hypercare period. They also provided system documentation and a knowledge transfer programme for our internal team.
Why did you choose this company over other providers you considered?
The quality of the questions they asked during the briefing process was the first indicator. Vendors who ask precise questions in the sales phase tend to apply the same rigour during delivery. That hypothesis proved accurate. The technical proposal was substantive, the team structure was senior throughout, and the pricing was transparent.
How clearly did the company understand your requirements and business goals?
Thoroughly and precisely. The requirements document they produced was detailed enough that our QA team used it directly to write acceptance criteria. Every user story had a defined business objective attached. Nothing was left to interpretation. That discipline in the requirements phase paid dividends throughout development and testing.
How was your overall experience with their communication and project management?
Professional and efficient. The project manager maintained a clear view of the critical path at all times and communicated changes to it transparently. The one significant scope adjustment we made mid-project was handled through a clean change request process — fairly priced, clearly documented, and absorbed without disrupting the overall timeline.
Did the company deliver the project on time and within your expected budget?
Yes. I had privately built a contingency expectation into my planning given the project complexity and the number of integrations involved. None of that contingency was needed. The delivery landed on the agreed date and the final invoice matched the approved budget to within a fraction of a percent. That outcome is rarer than the industry acknowledges.
What tangible results or business impact have you seen since the project was completed?
Quantifying the impact precisely is complicated by other variables in our business, but the metrics we can attribute directly to the Industry-Specific Solutions work are meaningful: session duration up, conversion rate up, error rate down, and our NPS for the digital touchpoint has improved by eleven points. Our account managers report that the new capability is coming up positively in client conversations.
What did you like most about working with this company?
The continuity of the team. The engineers who participated in the discovery sessions were the engineers who built the system. That consistency of institutional knowledge across a six-month project has a value that is difficult to quantify but easy to notice when it is absent. Every conversation built on the previous ones.
Would you recommend this company to others, and would you work with them again?
Absolutely. With a specific note that the value starts in the discovery phase — clients who approach that process with seriousness will get the most from the engagement. We invested appropriately at the front end and the returns are evident in what was delivered.

Security posture transformed from a known liability to a competitive differentiator

Reuben Loh / CTO - Marina Bay Ventures Pte Ltd
Verified
Jan 12, 2026

Project summary: The project had a board-facing delivery date tied to a strategic initiative. We needed a partner who would treat that date as their own, not ours.

We had worked with three agencies before this engagement. The comparison is not flattering to the others. What distinguished this team was a systematic approach to understanding the problem before proposing a solution — something that sounds obvious and is practiced far less often than it should be. The delivery phase ran to schedule, the codebase is clean enough that our internal engineers made positive comments during handover review, and we have not logged a critical incident in five months of live operation. We intend to use them for our next phase of work.

PROS

Deep domain knowledge that reduced the discovery overhead significantly, proactive risk identification before issues became incidents, delivery cadence that our stakeholders found reassuring

CONS

The quality of documentation they produce means our team needed to set aside dedicated review time to do it justice — a minor scheduling point rather than a genuine criticism

4.5
Overall
5.0
Quality
4.5
Schedule
4.5
Cost
4.5
Communication
Project TypeCybersecurity
IndustrySports & Fitness
Project Cost$50,000 to $149,999
DurationMar 2025 – Oct 2025

Questions & Answers

Please describe your company, your role, and the industry you operate in.
As CTO at Marina Bay Ventures Pte Ltd I oversee technology investment and delivery across our Sports & Fitness operations in Singapore. We are a commercially focused business and our technology choices are always evaluated in terms of their direct contribution to business outcomes rather than technical elegance alone.
What specific problem or business challenge led you to hire this company?
A competitive threat had accelerated our roadmap. We had planned a significant Cybersecurity investment for the following year. External pressure moved that timeline forward by six months and required us to find an external partner rather than attempting to build internally in the time available.
What services did the company provide for your project?
End-to-end Cybersecurity delivery with particular depth in the integration and data migration components, which were the highest-risk elements of the programme. They supplemented this with a dedicated QA resource throughout development and a documented runbook for our operations team at handover.
Why did you choose this company over other providers you considered?
A trusted peer in the Sports & Fitness sector had used them for a comparable Cybersecurity engagement and their recommendation was unequivocal. Our own due diligence confirmed the pattern they described. The combination of domain knowledge, Cybersecurity depth, and demonstrated delivery discipline was the deciding factor.
How clearly did the company understand your requirements and business goals?
Thoroughly and precisely. The requirements document they produced was detailed enough that our QA team used it directly to write acceptance criteria. Every user story had a defined business objective attached. Nothing was left to interpretation. That discipline in the requirements phase paid dividends throughout development and testing.
How was your overall experience with their communication and project management?
Professional and efficient. The project manager maintained a clear view of the critical path at all times and communicated changes to it transparently. The one significant scope adjustment we made mid-project was handled through a clean change request process — fairly priced, clearly documented, and absorbed without disrupting the overall timeline.
Did the company deliver the project on time and within your expected budget?
On time and within the approved budget. The estimation accuracy was notable — they had broken the work down in sufficient detail during discovery that their forecast proved reliable throughout, rather than being a number that shifted with every change in scope. We received one change request and it was for scope we had introduced ourselves.
What tangible results or business impact have you seen since the project was completed?
We went live four months ago. User adoption exceeded the target we had set by 23 percent in the first month. Support ticket volume has dropped measurably. The features we had deferred because the previous architecture made them prohibitively expensive to build are now in development. The platform they built has opened our roadmap.
What did you like most about working with this company?
Their instinct for keeping the business objective visible throughout technical decision-making. I have worked with technically excellent teams who lose the strategic thread as complexity increases. This team maintained a clear connection between every architectural choice and the outcome we had agreed to achieve. That orientation made the trade-off conversations significantly easier.
Would you recommend this company to others, and would you work with them again?
Absolutely. With a specific note that the value starts in the discovery phase — clients who approach that process with seriousness will get the most from the engagement. We invested appropriately at the front end and the returns are evident in what was delivered.

Company Info

Founded 2001
Employees 50 - 249
Hourly Rate $50 - $99
Client Rating 4.6/5 (8 reviews)

Rating Breakdown

Quality
4.8
Schedule
4.8
Cost
4.6
Communication
4.7

FAQs

What does ExtensionEngine's actual delivery process look like week to week?
ExtensionEngine generally runs something close to a standard structured process — requirements gathering, UI/UX design, development in agile sprints, QA testing along the way, deployment, and support once it's live. For context, it has served clients in USA, and it has been operating since 2001.
Would ExtensionEngine be a good fit for an early-stage startup?
Generally, yes — companies like ExtensionEngine tend to work well with startups because of what they typically offer: MVP builds, product strategy input, architecture that can scale later, and dedicated teams that keep costs manageable while still moving fast. For context, it has served clients in USA, and its average project cost is reported at $100000+.
Has ExtensionEngine actually shipped a SaaS product before?
It's a common line of work for a company like ExtensionEngine — multi-tenant architecture, subscription billing hooked up properly, and cloud-native deployment built for a product meant to scale as a service rather than a one-off build. For context, its listed capabilities span Custom Software Development, Mobile App Development, UI-UX Design, Web Design and Web Development, and it has experience across industries such as Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction.
Will ExtensionEngine sign an NDA before we even discuss the project in detail?
Most professional shops, including ExtensionEngine, expect to sign a Non-Disclosure Agreement before getting into specifics — it's a fairly standard ask and a reasonable one to make before sharing anything sensitive. For context, it has experience across industries such as Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction, and its average project cost is reported at $100000+.
What makes ExtensionEngine worth considering over other options?
What tends to set ExtensionEngine apart usually comes down to some mix of technical depth, relevant industry experience, how clients describe working with them, their development approach, communication habits, and whether they can actually deliver something that scales. Founded in 2001, the company has built a track record of delivering projects across various industries.
Roughly how long does a project with ExtensionEngine take start to finish?
It depends heavily on scope. A lean MVP might be a matter of weeks, while a full enterprise system or a larger digital transformation project can stretch into months once you factor in development, testing, and deployment. With a team of 50 - 249 professionals, ExtensionEngine can scale resources based on project urgency.
How do I actually get a real proposal out of ExtensionEngine instead of a generic reply?
The most reliable route is giving ExtensionEngine a clear, specific brief up front — through their website form, a direct email, or a call — since a vague ask tends to get a vague answer back, while a concrete one usually gets a proper estimate. For context, it has experience across industries such as Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction, and it reports a team size of 50 - 249 professionals.
What kinds of industries has ExtensionEngine actually built for?
ExtensionEngine has delivered projects across a range of different industries, including Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction.
Is ExtensionEngine more of an offshore setup or a local team?
That depends on where ExtensionEngine is based and who they primarily serve — some firms like this operate fully offshore, some are local-first, and plenty run a hybrid model that mixes both. For context, it has experience across industries such as Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction, and its average project cost is reported at $100000+.
What's the easiest way to actually get in touch with ExtensionEngine?
Most businesses reach ExtensionEngine through its website, a direct email, or a contact form — any of which works for discussing what you need, booking an initial conversation, or asking for a rough estimate. For context, its listed capabilities span Custom Software Development, Mobile App Development, UI-UX Design, Web Design and Web Development, and it has experience across industries such as Automotive, Pharmaceuticals & Biotechnology, Aerospace & Defense, Energy & Utilities, Sports & Fitness and Construction.

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