Boutique software consultancy — Paris

Custom software, engineered without compromise

ACCENSEO is a Paris-based consultancy for IT strategy and custom software development. Founder-led and deliberately selective, we bring enterprise-grade engineering standards to every engagement — without the layers in between.

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Trusted by leading enterprises

Founded in Paris

Core practice areas

Founder-led engagements

Point of contact, end to end

What we do

Consulting and engineering, end to end

From strategic advisory to production software: we design, build, integrate, host, and maintain the systems your business runs on.

Custom Software Development

Tailored software solutions engineered to meet your unique business requirements and scale with your growth.

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IT Consulting

Strategic technology advisory that aligns your IT investments with business objectives for maximum impact.

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Digital Transformation

Modernize your business with cutting-edge technologies that create new value and competitive advantage.

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Solution Integration

Seamlessly connect your enterprise systems and third-party solutions for unified operations.

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Cloud Services

Accelerate your cloud journey with expert migration, optimization, and managed cloud services.

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Cybersecurity

Protect your digital assets with comprehensive security solutions and proactive threat management.

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Managed Services & Support

Application maintenance, ongoing support, and managed IT services to ensure your systems' performance and longevity.

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Hosting & Data Services

Cloud infrastructure and dedicated servers for hosting, data processing, and database management.

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Your technology partner

We support enterprises in their digital transformation from Paris and Bordeaux.

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Selected work

How we approach an engagement

A closer look at the way we work — from the first workshop to production, and beyond.

Financial Services

FinTech Platform Modernization

Sector: financial services

How we help financial services organizations evolve a monolithic legacy platform toward a cloud-native architecture — without interrupting the daily flow of transactions.

Reliability

A resilient, always-on transaction platform

Agility

Frequent, low-risk, independent releases

Efficiency

A right-sized, demand-driven cloud footprint

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Healthcare

Healthcare Data Integration

Sector: healthcare

How we design standards-based integration platforms that let healthcare facilities share patient data securely, consistently, and in real time.

Interoperability

Standards-based exchange across facilities

Security

Privacy and compliance by design

Continuity

A consolidated view of the patient journey

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Retail & E-commerce

Omnichannel Retail Transformation

Sector: retail and e-commerce

How we help retail groups unify physical stores and digital channels into a single, consistent customer journey.

Consistency

One seamless journey across every channel

Visibility

A single real-time view of stock and customers

Loyalty

A richer, more personal brand relationship

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Who we serve

Sector context, taken seriously

Good software starts with understanding the business behind it. We invest in the realities of each sector before writing a line of code.

Financial Services

Financial institutions operate under intense pressure: aging core systems, rising regulatory expectations (DORA, PSD2/PSD3, MiCA), open banking APIs, and customers who expect instant, seamless digital services. ACCENSEO helps financial services firms navigate this landscape with a pragmatic, engineering-led approach. We advise on architecture and modernization roadmaps, design and build custom applications — client portals, payment workflows, reporting and reconciliation tools — and integrate them cleanly with core banking platforms and third-party services. Our cloud expertise supports secure, resilient deployments with the availability and auditability the sector demands, and our maintenance services keep critical systems compliant and dependable over time. Typical technology themes include API-first architectures, event-driven payment processing, data platforms for risk and regulatory reporting, and hardened identity and access management.

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Healthcare

Healthcare organizations manage some of the most sensitive data there is, across systems that were rarely designed to work together. ACCENSEO helps hospitals, clinics, health-tech companies, and care networks turn that complexity into dependable digital services. We advise on system architecture and interoperability strategy, build custom applications — patient portals, care coordination tools, telehealth features, administrative workflow software — and integrate them with existing records systems using standards such as HL7 and FHIR. Security and confidentiality are treated as design constraints from day one, not afterthoughts, and our cloud practice helps teams host and operate services in line with the sector's strict data-protection requirements. With ongoing maintenance and support, we keep clinical and administrative software reliable as regulations, standards, and organizational needs evolve.

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Retail & E-commerce

Retail runs on thin margins and fast cycles: customers move between stores, websites, apps, and marketplaces, and expect stock, pricing, and service to stay consistent everywhere. ACCENSEO helps retailers and e-commerce companies build the technology backbone that makes this possible. We advise on commerce architecture and platform choices, develop custom software — storefront features, order management workflows, product information tools, internal dashboards — and integrate e-commerce platforms with ERP, inventory, logistics, and payment systems so data flows reliably across the chain. Our cloud engineering absorbs traffic peaks and seasonal load without overprovisioning, and our maintenance services keep revenue-critical systems fast and stable. Common technology themes include composable and API-first commerce, data pipelines for merchandising and personalization, and search and recommendation capabilities.

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Manufacturing & Industry

Industrial companies sit on enormous amounts of operational data, yet production systems, ERP, and business applications often remain disconnected. ACCENSEO helps manufacturers close that gap. We advise on digitization roadmaps and system architecture, build custom software for production monitoring, quality tracking, and traceability, and integrate shop-floor systems (MES, SCADA, industrial IoT) with ERP and business platforms so decisions rest on a single, trustworthy view of operations. Our cloud expertise covers hybrid architectures where latency-sensitive workloads stay close to the line while analytics run centrally, and our maintenance services keep production-critical software dependable over long industrial lifecycles. Typical technology themes include industrial IoT data collection, predictive maintenance analytics, digital work instructions, and end-to-end supply chain digitization.

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Energy & Utilities

The energy transition is as much a software challenge as an infrastructure one. Distributed renewable production, smart meters, and electrification generate volumes of operational data that legacy systems were never designed to handle. ACCENSEO works with utilities, renewable energy operators, and energy service companies to turn that data into control and insight. We advise on data and system architecture, develop custom applications — asset monitoring, production forecasting support, energy reporting, customer self-service — and integrate metering, SCADA, and market systems with modern data platforms. Our cloud engineering handles high-volume time-series data cost-effectively, and our maintenance services keep operational tools reliable for teams that depend on them around the clock. Typical technology themes include IoT telemetry ingestion, time-series analytics, energy data visualization, and regulatory and sustainability reporting.

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Public Sector

Public organizations face a demanding equation: modernize aging information systems, deliver digital services that every citizen can use, and meet strict requirements for security, accessibility, and data sovereignty — often within constrained budgets. ACCENSEO supports administrations, local authorities, and public operators with a pragmatic approach. We advise on modernization and digitization strategy, build custom software — online service portals, case-management tools, internal workflow applications — and integrate new services with existing registries and back-office systems. In France, we work within the state's frameworks, including RGAA accessibility standards and FranceConnect identity integration. Our cloud practice helps teams choose sovereignty-conscious hosting, and our maintenance services sustain public services that must remain available and trustworthy for years. Typical technology themes include paperless process design, secure identity and access, and open, well-documented APIs between public information systems.

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Telecom & Media

Telecom operators run some of the most demanding technical environments there are: massive event volumes, stringent availability targets, and BSS/OSS estates built up over decades. Media companies, meanwhile, must distribute and monetize content across ever more channels. ACCENSEO brings software engineering discipline to both. We advise on architecture and modernization for operational and customer-facing systems, build custom tools — network data dashboards, provisioning workflows, self-service portals, content management features — and integrate them with existing BSS/OSS and streaming infrastructure. Our cloud expertise covers high-throughput data pipelines and services designed for scale, and our maintenance offering keeps operationally critical software stable release after release. Typical technology themes include real-time event processing, observability and network analytics, API platforms, and CDN and streaming integrations.

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Insurance

Insurance combines long-lived legacy systems with fast-moving customer expectations and a dense regulatory framework (Solvency II, IDD). ACCENSEO helps insurers, mutual companies, and brokers modernize at their own pace without putting operations at risk. We advise on system and process modernization, build custom software — policyholder portals, claims-handling workflows, underwriting support tools, broker extranets — and integrate new applications with policy administration and core insurance systems. Automation is a recurring theme: replacing manual, document-heavy steps with reliable digital workflows while keeping human judgment where it matters. Our cloud practice supports secure, compliant hosting, and our maintenance services keep regulated systems current as rules and products evolve. Typical technology themes include workflow automation, document processing, data quality for reporting, and API-based ecosystem integration.

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Our technology partners

Our commitments

What you can hold us to

“Every deliverable that leaves ACCENSEO is work I am prepared to defend personally. We would rather decline an engagement than lower the bar.”

José DA COSTA

Founder & President, ACCENSEO

“No opaque staffing and no hand-offs to anonymous teams. You know exactly who is doing the work — and you talk to that person directly.”

José DA COSTA

Founder & President, ACCENSEO

“We measure ourselves on things you can verify: software in production, systems that hold, and decisions you fully understand.”

José DA COSTA

Founder & President, ACCENSEO

Perspectives and engineering notes

Our take on technology choices, engineering practice, and digital strategy — written by the people who do the work.

Technology

Generative AI in the Enterprise: A Strategic Guide

Beyond the hype, how CIOs and business leaders can structure a generative AI adoption strategy that delivers durable value: use case selection, architecture choices, governance, and a pragmatic roadmap.

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Cloud & Infrastructure

Cloud-Native Architecture: Patterns That Transform Enterprises

Microservices, containers, event-driven design, and service mesh: the cloud-native patterns that let enterprises deploy faster and more reliably — and the discipline required to make them work in production.

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Cybersecurity

Zero Trust in the Enterprise: A Practical Implementation Path

With hybrid work, cloud adoption, and identity-based attacks, the perimeter security model has run its course. How to structure a Zero Trust program that is actionable rather than aspirational.

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Digital Strategy

Building a Digital Transformation Roadmap That Actually Works

Many transformation programs stall, overrun, or quietly fade away. What separates the ones that deliver: business anchoring, honest sequencing, executive ownership, and disciplined execution.

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Cloud & Infrastructure

FinOps: Taking Back Control of Your Cloud Spending

Cloud spending grows faster than the value it delivers in many organizations, and a meaningful share of it is avoidable waste. The FinOps discipline reconciles engineering agility with financial accountability.

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Technology

Data Mesh: Democratizing Enterprise Data Access

Data Mesh proposes decentralizing data ownership to the business domains that know the data best. After several years of enterprise adoption, here is what works, what does not, and how to adopt it pragmatically.

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Let's discuss your project

Our team is ready to support you in your technology challenges. Contact us for a free consultation.