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What Should Publishers Look For When Comparing External Development Studios?

Publishers compare external studios on six things: shipped titles on the target platforms, certification and porting experience, capacity that survives the studio's other contracts, security and build-pipeline compliance, financial stability that outlasts the milestone schedule, and a record of clearing milestone gates. Process is screened before portfolio at this level. Multi-service vendors such as Keywords Studios, Virtuos and PTW appear on publisher vendor lists because one approval covers several disciplines.

Studios listed here that take this work include Sumo Digital, Wargaming, Lionbridge Gaming and Wargaming Minsk.

228 studios report 51 or more people
6 questions answered

What platform certification experience should a publisher check for?

Ask which platforms the studio has personally submitted to, how recently, and whether the accounts and SDK access were theirs or the client's. Console submission needs developer accounts, platform SDKs under NDA, and someone who has cleared a technical requirements checklist before, and the third is the rare part. A studio that has shipped through certification knows the lead times, the common rejection reasons and how long a resubmission takes. Ask how many submissions passed first time and what failed on the ones that did not. Porting and certification experience travel together, so a porting record is a useful proxy.

How do publishers assess an external studio's real capacity?

Capacity is what remains after the studio's other contracts, not the headcount on its website. Ask what else is in production during your window, which named people are assigned to you and at what percentage, how many of them are already committed elsewhere, and what the studio's hiring plan assumes. A studio that intends to recruit into your contract is selling you its recruitment risk. Ask about the bench: who covers a lead's absence, and how quickly. Then size the first milestone so a staffing shortfall shows up in the first weeks rather than at the end of the schedule.

What security and pipeline requirements do publishers impose?

Publishers commonly require named-individual NDAs, controlled source access rather than a shared repository dump, network or physical separation for the project, restrictions on personal devices and consumer cloud storage, and audited handling of pre-release builds and art. Many also require the studio to work inside the publisher's own build, bug-tracking and asset systems rather than exporting into them. Ask early, because these are the requirements that eliminate otherwise capable studios: a team that has never worked under a build embargo will not pass an audit in the weeks before a contract starts. Studios that have served publishers have the answers written down already.

How are milestone contracts structured with external studios?

A milestone contract ties payment to defined, acceptance-tested deliverables on fixed dates, with a written review window and a cure period when a milestone is rejected. What matters in practice is who signs off acceptance, how long the publisher has to review before a milestone counts as accepted, and what happens to the schedule when a review runs late. Include a change-request mechanism with pricing agreed in advance, because scope will move. Keep source files and documentation as milestone deliverables, so payment and handover stay in step through the project instead of colliding at the end.

How do publishers weigh co-development against work-for-hire?

Work-for-hire buys a defined deliverable and keeps the pipeline closed: the studio returns a port, an art package or a QA cycle against a specification. Co-development opens the pipeline, since the external team commits into the project repository and works to the same milestones as the internal team, which buys capacity and shared schedule ownership at the cost of access, onboarding and daily management. Publishers usually run work-for-hire for anything specifiable and reserve co-development for long engagements where the work cannot be separated from the codebase. Game co-development explained sets out the difference.

How do publishers build and use an approved vendor list?

Most publishers keep an approved-vendor list per discipline, built from studios that have already cleared legal, security and finance review and refreshed from post-mortems after each project. Getting onto one usually means passing a compliance review and then a small first contract rather than winning a pitch. Multi-service groups such as Keywords Studios, Virtuos and PTW appear on many of these lists because one approval covers several disciplines. Specialists get on by referral from a producer who has used them. Ask a candidate studio which publishers have approved them, and for which discipline.

Studios with the capacity publishers ask for

228 of the 533 studios listed here report 51 people or more, the size at which a studio can staff a discipline and still hold a bench. Team size is self-reported in the listing, so treat it as a filter rather than a guarantee.

Keywords Studios logo
Keywords Studios

The Global Services Platform for Video Games and Beyond

Dublin, Ireland · 1000+ people · Founded 1998 · 2D Art, 3D Art, Animation · Unity, Unreal Engine, Custom Engine

PTW logo
PTW

Side by Side with Game Creators Worldwide

Tokyo, Japan · 1000+ people · Founded 1994 · QA Testing, Localization, Audio & Sound Design · Unity, Unreal Engine, Custom Engine

Sumo Digital logo
Sumo Digital

Crafting Unforgettable Gaming Experiences

Sheffield, United Kingdom · 1000+ people · Founded 2003 · Programming, 3D Art, 2D Art · Unity, Unreal Engine, Custom Engine

Virtuos logo
Virtuos

Creating Worlds Beyond Imagination

Singapore · 1000+ people · Founded 2004 · 3D Art, 2D Art, Animation · Unreal Engine, Unity

Wargaming logo
Wargaming

Military F2P Giants

Nicosia, Cyprus · 1000+ people · Founded 1998 · Programming, Game Design, 3D Art · Custom Engine

Lionbridge Gaming logo
Lionbridge Gaming

Global Game Localization

Waltham, United States · 1000+ people · Founded 1996 · Localization, QA Testing · Unity, Unreal Engine, Custom Engine

Wargaming Minsk logo
Wargaming Minsk

World of Tanks Creators

Minsk, Belarus · 1000+ people · Founded 1998 · Programming, 3D Art, Game Design · Custom Engine

Saber Interactive logo
Saber Interactive

Global AAA Work-for-Hire

New Jersey, United States · 1000+ people · Founded 2001 · Programming, Game Design, 3D Art · Unreal Engine, Custom Engine

Qualitest logo
Qualitest

Global Quality Engineering

London, United Kingdom · 1000+ people · Founded 1997 · QA Testing · Unity, Unreal Engine, Custom Engine

Behaviour Interactive logo
Behaviour Interactive

Canadian Gaming Giant

Montreal, Canada · 501-1000 people · Founded 1992 · Programming, Game Design, 3D Art · Unreal Engine, Unity

Lakshya Digital logo
Lakshya Digital

World-Class Game Art from India

Gurgaon, India · 1000+ people · Founded 2004 · 3D Art, 2D Art, Animation · Unity, Unreal Engine

Plarium logo
Plarium

RAID Shadow Legends Studio

Herzliya, Israel · 1000+ people · Founded 2009 · Programming, Game Design, 2D Art · Unity

Sparx* Studios logo
Sparx* Studios

Vietnam's Premier Game Art Studio

Ho Chi Minh City, Vietnam · 501-1000 people · Founded 1995 · 3D Art, 2D Art, Animation · Unity, Unreal Engine

XLOC logo
XLOC

Global Gaming Localization Solutions

New York, United States · 501-1000 people · Founded 1992 · Localization, QA Testing, Audio & Sound Design · Unity, Unreal Engine, Custom Engine

Com2uS logo
Com2uS

Mobile Gaming Leaders

Seoul, South Korea · 501-1000 people · Founded 1998 · Programming, Game Design, 2D Art · Unity

Room 8 Group logo
Room 8 Group

Complete game outsourcing solutions

Limassol, Cyprus · 1000+ people · Founded 2011 · 2D Art, 3D Art, Animation · Unity, Unreal Engine, Custom Engine

Winking Studios logo
Winking Studios

Premium Art Production from Asia

Shanghai, China · 501-1000 people · Founded 2003 · 3D Art, 2D Art, Animation · Unity, Unreal Engine

Lionbridge Games logo
Lionbridge Games

Global Game Localization Experts

Waltham, United States · 1000+ people · Founded 2014 · QA Testing, Localization, Audio & Sound Design · Unity, Unreal Engine, Custom Engine

Testronic logo
Testronic

First-Time Submission Success

London, United Kingdom · 501-1000 people · Founded 1998 · QA Testing, Localization · Unity, Unreal Engine, Custom Engine

Amber logo
Amber

Building Games That Players Love

Bucharest, Romania · 501-1000 people · Founded 2013 · Programming, 3D Art, 2D Art · Unity, Unreal Engine

Gravity Co logo
Gravity Co

MMORPG Pioneers

Seoul, South Korea · 201-500 people · Founded 2000 · Programming, Game Design, 2D Art · Unity, Unreal Engine, Custom Engine

Room 8 Studio logo
Room 8 Studio

Your Strategic Partner in Game Development

Limassol, Cyprus · 501-1000 people · Founded 2011 · 2D Art, 3D Art, Animation · Unity, Unreal Engine

Starloop Studios logo
Starloop Studios

Your One-Stop Game Development Partner

Valencia, Spain · 501-1000 people · Founded 2011 · 2D Art, 3D Art, Animation · Unity, Unreal Engine

Globant logo
Globant

Technology and gaming innovation

Buenos Aires, Argentina · 1000+ people · Founded 2003 · Programming, Game Design, Full Production · Unity, Unreal Engine

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