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onext technology

Context engineering for enterprise AI

We build your company's AI intelligence .

We capture your processes and your knowledge and turn them into AI that reaches production, at a cost you can defend to the board. We start by accelerating your team and, from there, we build the intelligence of your whole company.

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Explore Our Services

Focusing on the "why", we combine technical expertise and proven methodology to help you scale your development team.

Talent as a Service

Scale your team without months of searching. Supervised by us

We Want to Be Part of Your Success

We help technical teams dream bigger, move faster, and build extraordinary products. It all starts with a conversation.

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They work with us

Success Stories

Real transformations with measurable results. This is how we help technical teams reach their full potential.

A group of friends enjoying an outdoor social event, throwing coloured powder - representing the Plannet app for creating and discovering events
Logo de Plannet
12 weeks
Time to Market
100% Cloud Native
Architecture
Full Development

From idea to production MVP: Plannet connects communities through events

A complete social platform to create, discover and manage local events and plans

The challenge

Plannet needed to turn its vision into a working mobile app that would let users create, discover and manage social events with ease. As a startup, they required a fast MVP with a dynamic feed, user profiles, event management and a modern cloud architecture to validate their business model and connect local communities.

5.0★
On iOS and Android since launch
iOS + Android
Single codebase with React Native

Tech stack

React NativeNestJSAWSIaCS3RedisExpoTypeScriptGeolocation
Transformation and strategy with an AI Center of Excellence: the product team went from 0 to 1 weekly release, x7 velocity and 65% fewer production bugs
Confidential Client
x8
Velocity
-40%
Development time
IT Transformation

From constantly missing deadlines to 1 weekly release: transformation with AI and agile methodologies

AI Center of Excellence for a technology product team

The challenge

The team worked without direction: with no clear objectives or defined deadlines, each developer did whatever they considered urgent. The result: constantly broken promises, zero predictability and credibility eroded sprint after sprint. Without agile methodologies or automation, every release was unpredictable. The CTO needed to align the team around objectives, professionalise processes and rebuild the business's trust.

-65%
Thanks to automated testing
0
Transformation without pausing deliveries

Tech stack

Claude CodeSpec-Driven DevelopmentGitHub ActionsJestCypressSonarQube

"I had lost the business's trust by promising and not delivering. In 2 months we went from total chaos to a predictable weekly release. Now the team is focused, works with clear objectives and I have rebuilt my credibility."

CTO
B2B SaaS company
Screens of the Hacktua app: healthy recipes, expert-led programs, habit journal and home screen with Premium subscription
Logo de Hacktua
86,100
Community
5.0★ / 4.9★
Rating
Full Development

Hacktua: a wellbeing app with 380+ pieces of content and a personalized profiling algorithm

End-to-end development of an iOS/Android mobile app with CMS, learning paths, recipes and cross-platform subscriptions

The challenge

Hacktua had a clear vision: a wellbeing platform that would help its users build sustainable habits through educational content and personalization. But taking it to production required building from scratch a cross-platform mobile app, a CMS to manage 80+ hacks and 300+ recipes, a secure subscription system on iOS and Android, and an algorithm capable of adapting recommendations to each user's goals. All without compromising performance, security or the experience that justifies a premium subscription.

380+ pieces
80 hacks and 300 recipes managed via CMS
iOS + Android
Single codebase with React Native

Tech stack

React NativeNode.jsMongoDBAWSRevenueCatCMSTypeScript
View full case
Ongoing project

Latest Insights

Analysis, learnings and perspectives on IT transformation, artificial intelligence and modern architectures.

Two engineers in an office at dusk: one slides a single access card across the desk while keeping the rest of the stack, as a metaphor for minimum permissions in an AI agent
IA

Prompt injection: your agent's security lives in the permissions, not in the prompt

Inside a language model there is no separate channel for instructions and another for data, so prompt injection cannot be patched — it has to be bounded. This piece moves the defence from where it does not work — the system prompt and filters — to where it does: the tool permission table. Willison's lethal trifecta and Meta's rule of two as design criteria; the nine fields of a tool record; the six patterns with provable resistance and what they cost in utility; and the anatomy of two real incidents, EchoLeak in Microsoft 365 Copilot and the toxic agent flow through GitHub's MCP server. With OWASP LLM01:2025, the UK NCSC warning, "The Attacker Moves Second", CaMeL, AgentDojo, InjecAgent and spotlighting.

Aug 1221 min
Read
A domain specialist reviewing and labelling evaluation cases for an AI system alongside an engineer, at dusk in a technical office
IA

The golden set: how to build the cases that decide whether your AI works

"Show me your golden set" organises a conversation about AI in production faster than any other question. This piece builds the object the rubric and the baseline take for granted: where the cases come from (traffic, incidents and risk hypotheses), why you stratify by capability rather than volume, how many cases you actually need, why your labelling error rate is the ceiling for everything else, and why a held-out set is a consumable resource with a looking budget. With CheckList, Northcutt's work on label errors, Aroyo and Welty's crowd truth, the reusable holdout from Dwork and colleagues in Science, GSM1k and the re-annotation of SWE-bench Verified.

Aug 1119 min
Read
An engineer reviewing a grid of evaluation criteria and a comparison between two versions of an AI agent across working screens
IA

Evaluating AI agents: what "works better" actually means

"It works much better" carries no information: missing are what against, measured how, and with how much confidence. This piece builds the two missing objects. The rubric: how binary, verifiable criteria are derived from the golden set, with blocking criteria, trajectory evaluation and the null agent test. The baseline: the five mandatory reference points, including the ablation almost nobody runs. And the minimum statistics needed to know whether a three-point difference is real. With τ-bench and pass^k, "AI Agents That Matter", HealthBench, Agent-as-a-Judge, Anthropic's work on error bars and METR's trials.

Aug 724 min
Read