Guide MVP Combien coûte le développement d'un MVP en 2026 ? Coût d'un MVP en 2026 : de 10 000 à 50 000 USD selon le périmètre, souvent 10 000 à 20 000, comparaison agence US/UK, facteurs de prix et IA. Lire le guide Guide des prix Logiciel métier sur mesure : prix, délais et quand le faire développer Logiciel sur mesure en 2026 : nos prix dès 10 000 USD, délais par type de projet, quand le sur mesure bat un SaaS et ce qui fait varier le devis. Lire le guide Guide MVP Les étapes de développement d'un MVP : un plan semaine par semaine Les étapes du développement d'un MVP : discovery, réduction du périmètre, design, sprints, QA et lancement, plan sur 12 semaines, rôles et erreurs. Lire le guide Guide CRM CRM sur mesure ou HubSpot / Salesforce : le vrai coût sur 3 ans CRM sur mesure ou HubSpot / Salesforce : calcul du coût sur 3 ans pour 10, 25 et 50 utilisateurs, coûts cachés de chaque option et seuil de rentabilité. Lire le guide CRM decision guide Custom CRM vs HubSpot: when building your own pays off Custom CRM vs HubSpot for 10-200 person companies: a 3-year cost comparison at 25 and 60 users, a checklist for when to stay, the hybrid option and migration. Lire le guide ERP guide Custom ERP for a 10-60 person company: what it costs and how to scope it Custom ERP development cost for a 10-60 person company: our ranges ($40k to $90k for a full system), module-by-module scoping, timelines and hidden costs. Lire le guide Checklist acheteur Comment choisir une agence IA : la checklist de l'acheteur Choisir une agence IA en 2026 : grille d'évaluation, questions sur le RAG, l'évaluation, la confidentialité des données et les coûts, signaux d'alerte. Lire le guide Buyer's checklist How to choose a custom software development company: 12 questions to ask before you sign How to choose a custom software development company: 12 questions to ask before you sign, what good answers sound like, a scoring table and red flags. Lire le guide Founder guide Fractional CTO, agency or in-house team: what a non-technical founder should pick Fractional CTO, agency or in-house team? Costs per month, what each actually does, which fits each startup stage, and the combinations that work. Lire le guide Guide de l'externalisation Externaliser le développement logiciel en Ukraine en 2026 : tarifs, fuseaux horaires, risques et contrats Ingénieurs ukrainiens seniors à 30-50 USD/h en 2026, soit un tiers à un quart des tarifs US. Tarifs par rôle et par projet, fuseaux, guerre, contrats, PI. Lire le guide Rates guide Software developer rates in Ukraine in 2026: agencies, freelancers and in-house Ukraine developer rates in 2026 by role and seniority: salaries from DOU, freelance rates, agency rates, what an agency rate includes and in-house costs. Lire le guide Salary research Software developer salaries in Ukraine 2026: by role, stack and seniority Ukraine developer salaries in 2026: median net pay by role, seniority, language, city and English level from 12,000+ DOU survey answers and Djinni data. Lire le guide Guide des prix Développement IA au forfait : fonctionnement, prix et limites du prix fixe Développement IA au forfait : prix d'un projet IA ou d'une preuve de concept à prix fixe, cas où le modèle échoue et cadrage d'un sprint IA de 4 semaines. Lire le guide Free template Software requirements specification template for a fixed-price project (free download) Free software requirements specification template for a fixed-price project: 12 sections, a filled example, acceptance criteria and a Word download. Lire le guide Pricing models Fixed price vs time and materials: how to choose for software, AI and MVP projects Fixed price vs time and materials for software, AI and MVP work: a cost example, when each fits, hybrid models and the contract clauses to check. Lire le guide Guide des coûts Combien coûte un agent IA en entreprise ? Prix réels 2026 Prix d'un agent IA pour une PME en 2026 : développement dès 9 000 EUR, coût mensuel, SaaS ou sur mesure, exemple de ROI, RGPD et AI Act. Lire le guide IA pour le service client Agent IA pour le service client : ce qu'il sait faire, acheter ou développer, et comment le déployer Agent IA pour le service client en 2026 : ce qu'il gère bien, outil du marché ou sur mesure, helpdesk et CRM, relais humain, déploiement et indicateurs. Lire le guide Automatisation IA Quels processus métier automatiser en priorité avec l'IA ? Automatiser ses processus métier avec l'IA : grille de notation (volume, règles, coût d'erreur), calcul du ROI et exemples réels de dispatch et de CRM. Lire le guide AI automation What an AI automation agency actually does (and what it should cost you) What an AI automation agency does: the three types of agency, deliverables to expect, pricing models and our ranges from $10k, and how to vet one. Lire le guide AI automation AI invoice and document processing: how it works and what it costs How AI invoice and document processing works: the 6-step pipeline, realistic accuracy, off-the-shelf vs custom, build cost from $10k and cost per page. Lire le guide AI agent examples AI agents for business: 15 real examples by department 15 AI agent examples for business by department: sales, support, operations, finance, HR and engineering, with the tools each needs, risk level and cost. Lire le guide AI agent guide How to build an AI agent for your business: a 30-day plan from PoC to production How to build an AI agent for business in 30 days: pick the task, design tools and permissions, build an eval set, ship in shadow mode, then go live. Lire le guide Voice AI guide AI voice agent for business: custom build vs off-the-shelf AI receptionist AI voice agent for business in 2026: off-the-shelf AI receptionist vs voice platform vs custom build, cost per minute, latency, legal rules and rollout. Lire le guide Automation guide n8n vs Zapier vs custom code: when your automation outgrows no-code n8n vs Zapier vs custom code in 2026: how pricing scales with volume, what each handles well, 9 signs you have outgrown no-code and what a move costs. Lire le guide Model Context Protocol Qu'est-ce qu'un serveur MCP, et votre produit en a-t-il besoin ? Qu'est-ce qu'un serveur MCP : comment le Model Context Protocol donne outils, ressources et prompts aux assistants IA, auth, sécurité, cas d'usage SaaS. Lire le guide Guide intégration IA Intégration de ChatGPT et Claude : ajouter l'un ou les deux à votre produit, étape par étape Intégrer ChatGPT et Claude à votre application en 10 étapes : l'un ou les deux derrière une seule interface, RAG, appels d'outils, garde-fous, évaluation, coûts. Lire le guide Guide RAG Mettre en place un RAG : architecture, chunking, bases vectorielles et évaluation Mettre en place un RAG en entreprise : ingestion, chunking, embeddings, bases vectorielles, recherche hybride, permissions, évaluation et échecs fréquents. Lire le guide AI architecture RAG vs fine-tuning: which one your business actually needs RAG vs fine-tuning for business: a decision test, 10 use cases, build and running costs, data you need, and when to combine both or use neither. Lire le guide Guide stack technique Symfony ou Laravel pour un SaaS en 2026 : une comparaison honnête Symfony ou Laravel pour un SaaS en 2026 : architecture, maintenabilité, API, back-office, files d'attente, tests, recrutement, performance et verdict. Lire le guide Cost guide How much does AI app development cost in 2026? AI app development cost in 2026: our ranges for AI web and mobile apps by scope (AI features from $10k), US/UK agency comparison, monthly model costs. Lire le guide Cost guide How much does AI chatbot development cost in 2026? AI chatbot development cost in 2026: our ranges by complexity (from $10k), a US/UK agency comparison, build vs buy, and monthly token and hosting costs. Lire le guide Outsourcing guide How much does offshore software development cost in 2026? Offshore software development cost in 2026: hourly rates by region, the hidden costs buyers miss, and total cost of ownership compared with in-house. Lire le guide Engagement models Dedicated team vs fixed price vs time and materials: which model fits your project? Dedicated team vs fixed price vs time and materials: how each model works, which projects it fits, the real risks, and the contract terms to insist on. Lire le guide Guide de l'externalisation Nearshore ou offshore pour le développement logiciel en 2026 : quel modèle convient à votre entreprise ? Nearshore : 0 à 3 heures de décalage, offshore : 6 à 12. Comparez coût, chevauchement, contrats et risques, et pourquoi l'Ukraine est nearshore pour l'UE. Lire le guide Guide des coûts React Combien coûte le développement React en 2026 ? Coût du développement React en 2026 : nos fourchettes dès 10 000 USD, comparaison agence US/UK, React Native et Next.js, recrutement et exploitation. Lire le guide Liste d'entreprises, mise à jour en octobre 2026 Les meilleures agences de développement SaaS en 2026 : 10 équipes et comment choisir Meilleures agences de développement SaaS en 2026 : nos critères, 10 sociétés d'Europe, des États-Unis et d'Inde, spécialité et tableau comparatif. Lire le guide Liste d'entreprises, mise à jour en octobre 2026 Les meilleures sociétés de développement d'agents IA en 2026 : 10 entreprises et comment choisir Meilleures sociétés de développement d'agents IA en 2026 : critères, 10 entreprises (USA, Europe, Inde), tableau comparatif et questions à poser. Lire le guide Liste de sociétés, mise à jour en octobre 2026 Sociétés de développement MVP en Europe de l'Est : 10 équipes en Ukraine, Pologne et Roumanie 10 sociétés de développement MVP en Ukraine, Pologne et Roumanie en 2026 : pour qui, tableau comparatif, coût typique d'un MVP (10-50 k USD) et 7 questions. Lire le guide Guide stack mobile React Native ou Flutter en 2026 : comment choisir pour votre application mobile React Native ou Flutter : rendu, performance, partage de code web, recrutement, coût et maintenance, avec le verdict d'une équipe qui livre les deux. Lire le guide Guide stack front end Next.js ou React en 2026 : quand une application React suffit et quand il faut Next.js Next.js ou React avec Vite en 2026 : rendu, SEO, hébergement, complexité, coût et équipe, avec tableau de décision et verdict pour SaaS et marketplaces. Lire le guide Guide stack back end Node.js ou PHP pour le back end d'un SaaS en 2026 : lequel choisir, et quand Node.js ou PHP pour un SaaS en 2026 : Node.js pour le temps réel et le streaming IA, PHP pour facturation, rôles et back-office. Tableau en 11 points et verdict. Lire le guide Guide stack IA Python ou Node.js pour un back-end IA en 2026 : lequel choisir, et quand utiliser les deux Python ou Node.js pour un produit IA : API de LLM, streaming, RAG, agents, fine-tuning, pipelines de données, hébergement et recrutement, avec verdict. Lire le guide Guide modernisation PHP Comment moderniser une application PHP legacy en 2026 : un plan étape par étape, sans réécriture Moderniser une application PHP legacy pas à pas : audit, migration vers PHP 8.x, tests d'abord, pattern strangler, Symfony et IA, sans réécriture. Lire le guide Modernization guide Legacy software modernization: rewrite, refactor or replace (with cost ranges) Legacy software modernization for a 10-60 person company: when to refactor, rewrite or replace, a scoring table, costs from $10k and a migration plan. Lire le guide Guide des coûts Laravel Combien coûte le développement Laravel en 2026 ? Coût du développement Laravel en 2026 : prix par périmètre, tarif développeur Laravel par région, mises à jour, maintenance et comparaison des devis. Lire le guide Guide IA pour Laravel Intégrer OpenAI ou Claude dans une application Laravel : le guide de mise en production Intégrer OpenAI ou Claude dans Laravel : client HTTP ou SDK, jobs en file, streaming, prompts versionnés, RAG avec pgvector, coûts et tests. Lire le guide Guide IA pour Symfony Intégrer l'IA dans une application Symfony : OpenAI et Claude avec HttpClient, Messenger et pgvector Intégrer OpenAI ou Claude dans Symfony : HttpClient scopé, Messenger pour l'asynchrone, streaming, Doctrine avec pgvector et rate limiter. Lire le guide Symfony AI guide Symfony AI in production: Platform, Agent, Store and the MCP bundle explained Symfony AI explained for production: Platform, Agent, Store, AI Bundle and MCP Bundle, with config, code, cost logging, retries, tests and current status. Lire le guide Comparatif fournisseurs LLM API Claude ou API OpenAI en 2026 : une comparaison honnête pour les applications métier Claude ou OpenAI : où chacun gagne (longs documents, agents, voix, images), coût réel par tâche, données clients et comment trancher en testant sur 50 exemples. Lire le guide PHP AI library comparison, October 2026 Laravel AI SDK vs Prism vs Symfony AI vs LLPhant: which PHP AI library to use in 2026 PHP AI libraries compared for 2026: Laravel AI SDK, Prism, Symfony AI and LLPhant - versions, PHP requirements, providers, tools, RAG, tests and which to pick. Lire le guide PHP LLM API checklist, October 2026 OpenAI and Claude APIs in PHP: a production checklist for retries, timeouts, streaming, caching and cost Calling OpenAI or Claude from PHP in production: which SDK, retries that actually fire on POST, timeouts, streaming through PHP-FPM, caching, batch and cost logging. Lire le guide Guide d'ingénierie MCP Comment créer un serveur MCP pour votre SaaS : le guide étape par étape Créer un serveur MCP pour un SaaS : conception des outils, OAuth, lecture et écriture, brouillons, journaux, tests avec Claude et ChatGPT, code TypeScript. Lire le guide Liste d'entreprises, mise à jour octobre 2026 Les meilleures sociétés de développement de serveurs MCP en 2026 : 8 entreprises et comment choisir Sociétés de développement de serveurs MCP en 2026 : 8 entreprises de Pologne et d'Ukraine avec des travaux MCP publics, nos critères, un comparatif. Lire le guide Guide de la preuve de concept IA Comment mener une preuve de concept IA en 4 semaines : critères de succès, jeu d'évaluation et go ou no-go Mener une preuve de concept IA (agent, chatbot, documents) en 4 semaines : critères de succès, jeu d'évaluation réel, plan par semaine, go ou no-go et coût. Lire le guide Free tool LLM API cost calculator: what an AI feature costs per user per month on OpenAI, Claude and Gemini Free LLM API cost calculator for OpenAI, Claude and Gemini. Estimate the monthly cost of an AI feature per user, with prompt caching and Batch API discounts. Lire le guide AI cost guide OpenAI and Claude API cost for a real product: three workloads, real monthly bills OpenAI and Claude API cost in 2026 for three business workloads: document extraction, a tool-using agent and a SaaS feature, with full monthly bills. Lire le guide Guide de migration Symfony Fin de support Symfony 6.4 : migrer vers Symfony 7.4 LTS (support long terme), avec un plan, un calendrier et un budget réalistes Symfony 6.4 : fin des correctifs en novembre 2026, fin de la sécurité en novembre 2027. Plan de migration vers Symfony 7.4 LTS, délais et budget. Lire le guide PHP RAG guide RAG in PHP: retrieval on Symfony and PostgreSQL pgvector (code, costs, mistakes) Build RAG in PHP with Symfony and pgvector: HNSW migration, chunking, Messenger embeddings, tenant-safe DBAL search, citations, evals and real costs. Lire le guide PHP and Symfony MCP guide MCP server for a Symfony app: the official PHP SDK or a Node sidecar? Build an MCP server for a Symfony/PHP app: official PHP SDK and MCP Bundle vs a separate Node service. Code, transports, auth and lessons from production. Lire le guide RAG cost guide, November 2026 RAG chatbot cost in 2026: what it costs to build, and what it costs every month What a RAG chatbot over your documents costs: build ranges, cost per answer on Claude and OpenAI models, indexing, vector database and a year-one total. Lire le guide AI agent security guide How to give an AI agent safe write access to your CRM, ERP, Slack and Jira Safe write access for AI agents: per-user OAuth scopes, action allow-lists, approvals, idempotency, audit logs, prompt-injection limits, PoC and cost. Lire le guide AI decision guide AI agent vs chatbot vs automation: a 3-question test before you pay anyone AI agent, chatbot or plain automation? A 3-question test, what each costs to build and run, and why most first projects need an LLM step, not an agent. Lire le guide
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Services AI Sprint One month, one fixed price, one working result in production: an AI feature in your product, an AI agent that does a real job, or an assistant that answers from your own data. Voir le service Services Fractional CTO Anton Lytvynov, founder of Lytvynov Production, works as your part-time CTO: he makes the technical decisions with you, checks the people who build your product and keeps you in control of it, one or two days a week. Voir le service Services Technical due diligence A two-week, fixed-price review of a software product by a senior architect: what is solid, what is risky, what it will cost to fix, written so founders, investors and buyers can act on it. Voir le service Services Fractional CTO for startups For founders who are about to spend serious money on a first product and want a senior technical person on their side: before the vendor is chosen, while the MVP is built and when investors start asking technical questions. Voir le service Services AI proof of concept A short, fixed-price project that answers one question with evidence: can AI do this job on your data, accurately enough and cheaply enough to be worth building? Voir le service Services Fractional AI CTO For companies that want to use AI in their product or operations but have nobody senior to decide what is worth building, what it will cost every month and how to keep customer data safe. Voir le service Services Interim CTO When a CTO or technical co-founder leaves, someone has to own the technology the next morning. An interim CTO keeps the team shipping, secures what only the previous CTO knew and helps you choose the permanent one. Voir le service Services Independent code review For founders and managers who pay an agency or freelancers every month and cannot tell whether the work is good, whether the estimate is fair or what happens if the vendor walks away. Voir le service Services AI integration How we add LLM features to a product that already has users, data and a codebase, without breaking what works: architecture, guardrails, timeline and what drives cost. Voir le service Services Claude API integration How we build product features on the Anthropic Claude API: model tier choice, tool use, prompt caching, long documents, MCP, batch jobs, guardrails and running cost. Voir le service Services OpenAI API integration How we build product features on the OpenAI API: model choice, the Responses API, function calling, structured outputs, embeddings, migration from older APIs and running cost. Voir le service Services AI agent development What a business AI agent really is, which tasks it handles well, how we design the tools, permissions and approval steps around it, and what building one costs. Voir le service Services Custom software development We design, build and maintain software that does not exist off the shelf: products you sell, systems your team runs on, and AI features inside both. Voir le service Services Custom CRM and ERP development We build internal business systems for companies that have outgrown spreadsheets and off-the-shelf CRMs: one platform where sales, operations, warehouse and management work on the same data. Voir le service Services MCP server development We design, build and host Model Context Protocol servers that let AI assistants search, read and act in your SaaS or internal system with each user's own permissions. Voir le service Services AI automation For companies that want repetitive back-office work done by software: which processes to automate first, when AI is needed and when plain rules are better, and how a rollout looks. Voir le service Services AI chatbot development How a custom AI chatbot that answers from your own knowledge is built: grounding with RAG, handover to people, channels, accuracy testing, timeline and cost drivers. Voir le service Services RAG and LLM development We build retrieval-augmented generation (RAG) systems that let an LLM answer from your documents, tickets and databases, with sources, access control and measured accuracy. Voir le service Services MVP development We help founders and product teams turn an idea into a working product real users can pay for, with a week-by-week plan, honest scope cutting and AI features where they actually help. Voir le service Services SaaS development We design and build SaaS products end to end, from the first paying customer to a platform with teams, plans, integrations and an admin your staff can run. Voir le service Services Symfony and PHP development Symfony is our core back-end stack. We build new Symfony applications, upgrade and rescue legacy PHP code, and provide dedicated Symfony teams for long-running products. Voir le service Services AI audit An engineering review of one product: where AI features belong in it, whether your data supports them, and how the AI code you already run holds up on quality, security and cost. Voir le service Services AI consulting A short assessment that tells you which AI use cases are worth building, what they will cost to build and run, and what to do first, written by the engineers who would then build it. Voir le service Services Generative AI development How we build products whose core value is generated text or reasoning: copilots, document generators, writing tools and persona assistants, from model choice to quality control in production. Voir le service Services Dedicated team How a dedicated software development team from Lytvynov Production is put together, onboarded and managed, and what you should expect about reporting, replacements, ownership and cost. Voir le service Services AI product development The stages an AI product goes through between an idea and a product people pay for, what each stage must prove, and how we run them with our clients and for our own products. Voir le service Services React development We build React and Next.js web apps and React Native mobile apps together with the back end behind them, so one senior team owns the product from database to screen. Voir le service Services Software development company, Ukraine Who we are, how we work with clients abroad from Ukraine, how contracts and payments are set up, how we keep delivery running during the war, and what we build. Voir le service Services Laravel development We are a senior PHP team. We take over and maintain Laravel codebases, build Laravel APIs and admin panels, and add OpenAI or Claude features to Laravel apps, without pushing you to switch frameworks. Voir le service Services PHP development PHP is our core back-end language. We build new PHP products on Symfony, modernize legacy PHP code without a big-bang rewrite, upgrade old PHP versions to PHP 8 and add AI features to existing PHP applications. Voir le service Services Node.js development We build Node.js back ends in TypeScript for products that are JavaScript end to end, need real-time updates, or stream AI answers to the browser, together with the React and React Native apps on top. Voir le service Services Next.js development We use Next.js where public pages must rank in search and load fast: marketing sites, marketplaces, catalogs and public profiles, connected to a Symfony or Node.js back end built by the same team. Voir le service Services Python development We use Python where it is strongest: AI and machine learning services, FastAPI back ends for models, data ingestion pipelines and RAG, connected to the PHP, Node.js or React product around them. Voir le service Services React Native development We build cross-platform iOS and Android apps in React Native, together with the React web app and the back end, so one senior team owns the product from database to app store. Voir le service Services Flutter development We build Flutter apps for iOS and Android from one codebase, together with the back end, admin panel and landing page, from design to App Store and Google Play release. Voir le service Services Real estate 3D visualization For developers, agents and owners who sell apartments, penthouses and villas before they are finished, and need buyers to see the finished home, not the concrete shell. Voir le service Services Off-plan property marketing For developers and agents selling apartments before they are finished: a sales page where buyers watch the shell become the home they are buying. Voir le service Services Real estate virtual tour For developers and agents who want buyers to look around the finished rooms themselves, before a camera could photograph them. Voir le service Services 3D floor plan from photos For developers, agents and owners with a floor plan and photos of an empty or unfinished apartment, who need buyers to understand the layout at a glance. Voir le service Services Virtual staging For agents, developers and owners with empty or unfinished rooms, who want buyers to see a lived-in home and pick the style they like. Voir le service Services Real estate video marketing For developers and agents who need short videos for social media and listings, but have no finished interior to film. Voir le service
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