Def Method
Def Method is a New York-based professional services firm that modernizes high-risk Ruby on Rails systems for enterprise clients in financial services, retail, and other regulated or revenue-critical sectors via a fixed-scope assessment followed by guided incremental changes.
- Company typePrivate
- Founded2014
- HeadquartersNew York, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Def Method does
Def Method is a privately held, New York-headquartered professional services firm founded in 2014 by Joe Leo that specializes in modernizing Ruby on Rails systems for enterprise clients where breaking production carries material cost. The firm serves regulated, revenue-critical, and operationally sensitive applications in financial services, retail, sports media, nonprofit, and government, including named engagements with Citi, Paxos, Orum, Walmart, Dick's Sporting Goods, MoMA, Elias Sports Bureau, and a flood-relief program in New York. Its go-to-market is a direct sales motion that begins with a 30-minute system risk discovery call and proceeds through a fixed-scope, fixed-fee Assessment engagement lasting 2-3 weeks, followed by a Guided Modernization phase that introduces incremental changes under defined safety constraints with knowledge transfer to client engineering teams.
The underlying methodology is risk-aware incremental change: clients receive a system risk map, a test confidence evaluation, and prioritized modernization pathways before any code is altered, and subsequent modernization is executed under explicit rollback design and blast-radius constraints. Def Method's bench averages 10.5 years of experience per employee, supporting engagement-level technical depth that the firm explicitly contrasts with staff augmentation and feature-shop alternatives. The technology footprint centers on Ruby on Rails but extends to Kotlin, React, and TypeScript for API-based platform modernizations.
Revenue is generated entirely through two professional-services lines, the Assessment and Guided Modernization engagements, with the Assessment structured as a smaller fixed-fee entry point that gates the larger modernization engagement; pricing for individual engagements is not publicly disclosed. The firm reports an 80% repeat client rate and over 150,000 cumulative project hours, and supports demand generation through the Essential Complexity bi-weekly newsletter, The Ruby AI Podcast, and conference speaking. Def Method has no disclosed outside funding, operates solely from its New York office, and is not a software or SaaS provider. In 2016, the firm acquired Cyrus Innovation for an undisclosed amount, and the company remains founder-led.
Def Method firmographics
Firmographics- Name
- Def Method
- Legal name
- Def Method
- Website
- https://defmethod.com
- Company type
- Private
- Founded year
- 2014
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Def Method is a New York-based professional services firm that modernizes high-risk Ruby on Rails systems for enterprise clients in financial services, retail, and other regulated or revenue-critical sectors via a fixed-scope assessment followed by guided incremental changes.
- Ownership category
- akta.pro rank
Def Method industry classification
Industry- Product category
- Software Modernization Consulting
- NAICS
- Custom Computer Programming Services (541511)
- SIC
- Services-Computer Programming Services (7371), Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- DevOps, SRE & Platform Engineering Consulting (BPAHAEAK)
- akta.pro secondary industry
- Software Engineering & Application Development Training (Languages, Frameworks, Testing) (BPAEANAI)
Keywords
Where Def Method is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Def Method business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D
Revenue model
- Assessment Services: Fixed-scope, fixed-fee assessment engagements lasting 2-3 weeks. Deliverables include system risk map, test confidence evaluation, modernization pathways, and executive-ready recommendations. Provides clarity on where change is safe vs. dangerous.
- Guided Modernization Services: Incremental modernization engagements following the assessment phase. Scoped based on assessment findings, with knowledge transfer to client engineering teams. Only available after completing an Assessment.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Assessment - Fixed-scope, fixed-fee engagement |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels7 records
Def Method product offering
Product offeringCore offering
Def Method is an Agile Lean Software Development consultancy that modernizes Ruby on Rails systems for enterprise clients where failure is costly. The firm sells two interconnected professional services: a fixed-scope, fixed-fee Assessment (2–3 weeks) that maps system risk and modernization pathways, followed by Guided Modernization execution with knowledge transfer. Supporting the consulting practice, Def Method publishes the Essential Complexity newsletter and co-produces The Ruby AI Podcast.
Product overview
Def Method is a consulting firm that offers two interconnected professional services: an Assessment engagement and a Guided Modernization engagement. The Assessment is a time-boxed (2–3 weeks), fixed-fee diagnostic that maps system risk, evaluates test coverage, and produces actionable modernization pathways. Guided Modernization is the subsequent execution phase where Def Method implements changes incrementally under safety constraints, informed by the Assessment's findings. Supporting these core services, Def Method publishes two content products: Essential Complexity, a bi-weekly newsletter by Founder & CEO Joe Leo covering high-risk systems and AI in software, and The Ruby AI Podcast, a bi-weekly podcast (co-hosted with Valentino Stoll) on Ruby and AI development. The company does not offer a software product or SaaS platform.
Differentiator
Problem solved
Functional benefit
Brands
- The Ruby AI Podcast: A bi-weekly podcast exploring Ruby in the age of AI, hosted by Joe Leo and Valentino Stoll.
Products and services
- Assessment A fixed-scope, fixed-fee engagement lasting 2–3 weeks that maps where system change is safe versus risky, evaluates test confidence, and produces a modernization decision framework with executive-ready recommendations. Designed for enterprise teams running Rails systems where breaking things would be expensive.
- Guided Modernization Risk-aware incremental modernization execution following the assessment phase, scoped to assessment findings. Introduces changes incrementally under defined safety constraints with knowledge transfer to the client engineering team. Only available after completing an Assessment.
- Essential Complexity Newsletter Bi-weekly newsletter published by Founder & CEO Joe Leo exploring high-risk software systems, AI in development, modernization topics, guardrails architecture, and global team challenges.
- The Ruby AI Podcast Bi-weekly podcast exploring Ruby development in the age of AI, including tools, workflows, and the future of the craft, co-hosted by Joe Leo and Valentino Stoll. Distributed on Spotify, Apple Podcasts, and YouTube.
Quantifiable outcome
- Settlement times reduced by 7x at Paxos
- +3 more outcomes
Companies that use Def Method
Customer profileNamed customers11 records
Segments3 records
Ideal customer profiles2 records
Def Method technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature2 records
Def Method partnerships and signals
Strategic signalScale indicators3 records
Recent moves6 records
Expansion highlights5 records
Def Method competitors and assessment
Company assessmentDirect peers
- Test Double: US-based software consultancy that ships and improves production software for enterprise clients, with deep Ruby/Rails expertise. Comparable in senior-consultant delivery model and emphasis on improving engineering health of legacy systems.
- Hashrocket: Ruby on Rails consultancy historically focused on high-quality web application development. Comparable in stack specialization and services-only model, though they have notably pivoted their business model in recent years.
- Planet Argon: Boutique consultancy specifically focused on Ruby on Rails maintenance, upgrades, and modernization for established applications. Direct overlap with Def Method's Rails modernization niche and risk-aware delivery approach.
- thoughtbot: Long-standing Ruby on Rails consultancy offering product development and modernization services to startups and enterprises. Closely comparable to Def Method in stack specialization, services-led model, and content-driven thought leadership.
- DockYard: Digital consultancy specializing in Ruby on Rails, Elixir, and Phoenix for enterprise product engineering. Comparable in Ruby-stack focus, enterprise consulting model, and remote-first senior delivery team.
- Bold Tech (formerly Carbon Five): Full-service software consultancy building and modernizing web platforms for enterprise clients. Comparable professional services model, enterprise customer focus, and emphasis on iterative delivery of legacy modernization.
Regional players
- Icalia Labs: Latin America-based software consultancy with strong Ruby on Rails practice serving US enterprise clients. Comparable in Rails consulting delivery and nearshore enterprise focus, though operates primarily from a different geographic base.
- Reinteractive: Australia-based Ruby on Rails consultancy offering development and modernization services. Comparable in Rails specialization and consulting model, but serves APAC rather than Def Method's primarily US enterprise base.
Broad incumbents
- Slipstream: Larger IT consultancy offering modernization, cloud, and managed services to enterprise clients. Provides broad-based modernization that overlaps with Def Method's enterprise modernization positioning but without the niche Rails specialization.
Emerging players
- FastRuby.io: Specialized Rails upgrade and modernization service focused on version upgrades and code health tooling. Narrower in scope than Def Method (focused on Rails upgrades specifically) but directly competes on the modernization niche.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Def Method social profiles
Digital presenceDef Method financial estimates
Financial estimateRevenue estimate
Valuation estimate
Def Method leadership team
Management profileNumber of profiles
Profiles2 records
Def Method funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Def Method M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Def Method
What does Def Method do?
Def Method is an Agile Lean Software Development consultancy that modernizes Ruby on Rails systems for enterprise clients where failure is costly. The firm sells two interconnected professional services: a fixed-scope, fixed-fee Assessment (2–3 weeks) that maps system risk and modernization pathways, followed by Guided Modernization execution with knowledge transfer. Supporting the consulting practice, Def Method publishes the Essential Complexity newsletter and co-produces The Ruby AI Podcast.
Is Def Method a public or private company?
Def Method is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Def Method founded?
Def Method was founded in 2014. It employs 11 to 50 people.
Where is Def Method based?
Def Method is headquartered in New York, United States, in the North America region.
How does Def Method make money?
Two revenue lines are on record. Assessment Services are the primary driver. The others are guided Modernization Services.
Who are Def Method's main competitors?
Direct peers on record are Test Double, Hashrocket, Planet Argon, thoughtbot, DockYard and Bold Tech (formerly Carbon Five). Regional players are Icalia Labs and Reinteractive. Slipstream is listed as a broad incumbent. FastRuby.io is listed as an emerging player.
Does Def Method have an API?
No public API is recorded for Def Method.
What industry is Def Method in?
Def Method's product category is Software Modernization Consulting. Its primary akta.pro industry code is BPAHAEAK, DevOps, SRE & Platform Engineering Consulting, with a secondary code of BPAEANAI, Software Engineering & Application Development Training (Languages, Frameworks, Testing). Its NAICS code is 541511 and its SIC code is 7371.