--- title: "Custom Software & Web App Development Company — Gigabit" url: https://gigabit.agency/services/custom-software-development/ description: "Custom software and web app development by senior engineers working with AI agents. Past builds: a $48K MVP in 11 weeks, a $118K payments platform." lang: en --- Home (https://gigabit.agency/) / Services (https://gigabit.agency/services/) / Custom software development Custom software development company · fixed quotes # Custom software development, quoted as a fixed price. Web apps, portals, internal tools and platforms, built by senior engineers who hand the repetitive work to AI agents. **A fixed quote before work starts, a demo every week, and code you own.** Get a fixed quote: https://gigabit.agency/discovery-call/?offer=custom-software See what past projects cost: https://gigabit.agency/proof/project-costs/ The short answer ## What you get from a custom software development company like Gigabit. Gigabit builds custom software for companies that have outgrown spreadsheets, off-the-shelf tools or a first prototype: customer portals, internal tools, two-sided marketplaces, payment platforms and the APIs behind them. A senior engineer leads every build. AI agents take the repetitive work (tests, migrations, boilerplate, documentation), so a small team ships what used to need a large one. Every build starts with a short scoping phase that ends in a written, fixed price. The published projects show the range: a logistics SaaS MVP for $48,000 in 11 weeks, a two-sided marketplace for $72,000 in 14 weeks, a B2B payments platform for $118,000 in four months. You own the code, the cloud accounts and the data from the first day. What we build ## The custom software we build. Most projects take one of these shapes. Each ships with tests, CI/CD, monitoring and a hand-over your own team can run. ### Web applications Customer-facing web apps and SaaS products in React and Next.js with Node or Python back ends, multi-tenant from the first sprint when the product needs it. ### Portals and internal tools Customer, partner and staff portals that replace email chains and spreadsheets, wired to the CRM, ERP or billing system that holds the data. ### Marketplaces and booking platforms Two-sided platforms with search, messaging, reviews, payment holds and Stripe Connect payouts to vendors. ### Payment and fintech systems Payment flows, ledgers and reconciliation, with the audit trails and access controls a compliance review asks for. ### APIs and integrations The API layer and the connections to the systems you already run, documented so the next team can extend them. ### AI features inside the product Search, summaries, document extraction and agents built into the app, with evaluations that tell you when quality drops. How it runs ## Four steps, one fixed price. 01 #### Scope One to two weeks to agree the users, the core workflows, the data model and what is out. It ends in a fixed price and a sprint plan. 02 #### Build Two-week sprints with a demo on staging every Friday. You test the real software, and your feedback goes into the next sprint. 03 #### Launch Load tests, a security pass and a rehearsed deploy with a rollback plan, with monitoring live before the first customer logs in. 04 #### Run or hand over Keep the team as an embedded pod, or take it in-house with runbooks and a walkthrough of the code. How it is priced ## Published prices, mapped to the job. Every price here is the same one on the pricing page. Work with no published price gets a fixed price in writing before it starts. The job How we deliver it Price A full build, from scope to launchPublished builds ran from $48,000 to $124,000. Fixed-price build: https://gigabit.agency/proof/project-costs/ Fixed price in writing, after scoping Ongoing development after launch Embedded AI Teams: https://gigabit.agency/services/embedded-ai-teams/ $3,000–$7,500 / engineer / mo A review of a prototype someone else built Prototype Production Review: https://gigabit.agency/services/prototype-to-production/ $2,500 · fixed · 5 business days One AI workflow added to an existing app AI Quick Win Sprint: https://gigabit.agency/pricing/ $8,000 fixed · 3 weeks Figures in the notes are what past clients paid, from the published case studies; they show the range, not a rate card. Work with no natural end, such as ongoing development, is priced per engineer per month with no lock-in. An honest read ## When to hire us for this, and when not to. A good fit when - The software is the product, or runs a core part of the business. - Off-the-shelf tools need so many workarounds that the workarounds are the job. - You want to own the code and the data instead of renting a platform per seat. - Someone on your side can decide what ships each week. Look elsewhere when - A SaaS tool already does 90% of the job. Configure it instead; the platform pages cover most of them. - You need a marketing website. That is a Website Build on Webflow, WordPress or Framer. - Nobody on your side has an hour a week to review demos. Proof ## Four custom builds, with what they cost. A SaaS MVP, a marketplace, a payments platform and a telehealth platform. Each links to the full case study. Pre-seed logistics technology startup, US-based solo founder ### A $48K, 11-week logistics SaaS MVP that reached 14 paying customers and unlocked a $2.1M Series A. $48,000 Total investment 11 weeks Time to production 14 Paying customers (month 6) **Investment:** $48,000 · **Timeline:** 11 weeks to production Read the case study (https://gigabit.agency/proof/saas-mvp-logistics-platform/) B2B services marketplace startup, US-based, pre-seed ($500K) ### A $72K, 14-week two-sided marketplace build processed $2.4M GMV in year one and powered a $3.8M seed round. $2.4M Year 1 GMV $360K (15% avg rate) Commission revenue 35 → 840 Vendors on platform **Investment:** $72,000 · **Timeline:** 14 weeks to launch Read the case study (https://gigabit.agency/proof/marketplace-platform-build/) B2B construction payments startup, US-based, seed-funded ($2.1M) ### A construction payments platform built in 4 months for $118K processed $41.2M in year one with a 0.02% error rate. $41.2M Year 1 payment volume 0.02% Processing error rate 67 days → 12 days Subcontractor DSO **Investment:** $118,000 · **Timeline:** 4 months to MVP launch Read the case study (https://gigabit.agency/proof/fintech-payment-platform/) Physician-founded chronic disease management company (Type 2 diabetes and hypertension) ### HIPAA-compliant telehealth platform with 3 EHR integrations enrolled 1,200 patients in 90 days and backed a $4.5M Series A. 1,200 Patients enrolled (90 days) 34% → 78% Vitals adherence 50 → 180 (3.6x) Patients per coordinator **Investment:** $124,000 · **Timeline:** 5 months — launched 1 week ahead of deadline Read the case study (https://gigabit.agency/proof/healthtech-telehealth-platform/) These are past engagements at the prices those clients paid. For build price, monthly cost and payback side by side, see what ten client projects cost (https://gigabit.agency/proof/project-costs/). FAQ ## Custom software development, answered #### How much does custom software development cost? It depends on the number of user types, workflows and integrations. Our published builds give the range: $48,000 for a logistics SaaS MVP in 11 weeks, $72,000 for a two-sided marketplace in 14 weeks, $118,000 for a B2B payments platform in four months, and $124,000 for a telehealth platform with a mobile app in five months. You get a fixed price in writing after scoping, before any build work starts. #### How long does it take to build custom software? Most first versions take 8 to 20 weeks. The fastest published build reached paying customers in 11 weeks; a platform with three EHR integrations and a mobile app took five months. Scope is the main lever, which is why the first phase cuts the feature list to what the first users need. #### Who owns the code? You do. Repositories, cloud accounts and credentials sit in your name from the first day, and the hand-over includes runbooks and a walkthrough of the codebase. #### Where are your engineers? Gigabit is registered in Wyoming and delivers from its engineering hub in Dhaka, with a daily overlap window for US and European teams and a senior engineer leading every build. #### Do you use AI to write the code? Yes, for the repetitive parts: tests, migrations, boilerplate and documentation. Senior engineers design the system, review every change and own what ships. That is how a small team can commit to a fixed price. Related ## Often scoped alongside. #### SaaS development Multi-tenant products, billing and AI features, from MVP to scale. SaaS development https://gigabit.agency/services/saas-development/ #### MVP development The smallest product your first customers will pay for. MVP development https://gigabit.agency/services/mvp-development/ #### Prototype Production Review A $2,500 senior review of an app built with Lovable, Bolt, Replit, Cursor or Claude Code. Prototype Production Review https://gigabit.agency/services/prototype-to-production/ Go deeper ## From the field notes Software Factory · 5 min ### How much does custom software cost? Rates, project ranges and what moves the price https://gigabit.agency/insights/custom-software-cost/ Software Factory · 4 min ### What does an AI MVP actually cost? A build budget breakdown https://gigabit.agency/insights/ai-mvp-cost/ Software Factory · 5 min ### Software factory, not software agency: how the mid-market ships in the AI era https://gigabit.agency/insights/software-factory-vs-software-agency/ All insights →: https://gigabit.agency/insights/ Start here ## Have a system to build? Tell us what it has to do and who will use it. A senior engineer replies with questions, then a scoping plan and a fixed price. 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