Senior application developer
Creation, maintenance, recovery and modernization of specific business applications, mainly in WINDEV, WEBDEV, WINDEV Mobile, SQL and ERP environments.
Senior freelancer / complex IT / SaaS products
I design, modernize and connect critical business applications.
Freelance for more than 10 years, I work as Lead Tech, technical project manager and application architect on complex information systems environments: ERP, middleware, business applications, integrations, workflows and specific developments.
Hybrid senior profile
A profile at the intersection of code, business needs and information systems
Louis Planquart built his career around application development, before gradually evolving towards roles in tech lead, technical management and application architecture. His experience allows him to work on the code as well as on the structuring of needs, flows between applications, production constraints and coordination between business and IT teams.
Lead Tech & technical referent
Ability to frame subjects, guide technical choices, support teams and guarantee the consistency of the solutions delivered.
Application architect
Transversal vision of systems, flows, dependencies, production constraints and long-term maintainability.
Product Entrepreneur
Creation and posting of independent digital products or designed in partnership, with SaaS, UX, maintenance and continuous improvement logic.
Produce reliable codeResume a complex existingUnderstanding a business needStructuring a requestTechnically manage a subjectChallenge an architectureDocumentSecure a production launchSupport the teamsCreate digital products
Expertise
Main expertise
Interventions focused on business applications, IS flows, ERP, production and maintainability.
Business applications
Design, maintenance and evolution of critical business applications, with strong attention paid to robustness, maintainability and suitability for field uses.
Technologies
WINDEVWEBDEVWINDEV MobileHFSQLSQL ServerOracleAS400
IS & Middleware Integration
Creation, supervision and reliability of flows between internal applications, ERP, HR tools, payroll, invoicing, SaaS platforms and third-party systems.
Technologies
BluewayREST APIWeb servicesSFTPJSONXMLSQLlogssupervision
ERP & IFS Cloud
Intervention in complex ERP environments: configuration, workflows, interfaces, screens, rights, tests, support and coordination with business teams and integrators.
Technologies
IFS Cloud 24R1IFS Cloud 25R2workflowsprojectionsQuickReportscreensconfigurations
Technical management
Structuring requests, clarifying needs, documentation, business/IT coordination, technical arbitration and securing deliverables.
SKILLS
Analysisframingencryptiondocumentationrecipelevel 2 supportcontinuous improvement
Application modernization
Takeover of complex existing systems, reduction of technical debt, progressive improvement of tools, security of developments and support for changes.
Approach
Auditstabilizationnon-regressiongradual overhauldocumentationtransfer
SaaS Products
Creation of independent web products or designed in partnership, online platforms and end-user oriented tools.
Products
SimpleTransferMonalyraBingoLiveAskLeopold
Perimeters
Areas of intervention
Application and IS subjects that require as much technical rigor as understanding of real uses.
Business applications
Design, maintenance, evolution and recovery of specific business applications.
ERP & integration
Connecting ERPs with satellite applications, internal tools and SaaS platforms.
Middleware & APIs
Implementation of reliable, supervised and documented flows between systems.
Application modernization
Develop what already exists without weakening production.
Support and production
Incident analysis, correction, stabilization and continuous improvement.
SaaS Products
Design and publishing of independent digital products or developed in partnership.
AI applied to development
Using AI tools to accelerate development, documentation and analysis.
Technical project management
Framing, coordination, arbitration and support of teams.
Experiences
A long journey on critical applications
A deliberately factual timeline: missions, environments and responsibilities, without masking the reality of existing systems.
Manager of the applications department
FreelanceBALAS Group
January 2024 - today
Application manager over an extended IS scope: business applications, integrations, IFS Cloud ERP, Blueway middleware, technical coordination, application support and team support.
- Leadership and coordination of the applications department
- IS and middleware integration topics
- IFS Cloud 24R1 / 25R2 environments
- Workflows, configurations, screens, rights and interfaces
- Structuring requests and supporting teams
- Relationship between business, IT, integrators and production
BluewayIFS CloudworkflowsAPISQLbusiness applications
Independent developer analyst
Freelance
June 2015 - today
Interventions with different clients to design, maintain and develop specific business applications, with a historical specialization around WINDEV, WEBDEV, WINDEV Mobile and databases.
- Application development
- Technical analysis
- Encryption
- Documentation
- Maintenance
- Support
- Resumption of existing
- Gradual modernization
Developer analyst
Car park company
April 2021 - December 2023
Application developments and technical support on business management tools in an operational context.
Technical Lead / Developer
ATOLL Solutions
January 2019 - March 2021
Development, maintenance and technical management on WINDEV / WEBDEV applications.
WINDEV 23WINDEV 24
Developer
Collins Aerospace
September 2017 - January 2019
WEBDEV, WINDEV and HFSQL developments in an industrial context.
WEBDEV 20WINDEV 18HFSQL
Developer
Air Liquide
June 2017 - September 2017
Application maintenance, SQL Server stored procedures and C# webservices.
WINDEV MobileSQL ServerC#
Developer
GCA Charles André Group
September 2016 - May 2017
Creation of a showcase site, development of an Android mobile application for fleet management and creation of webservices.
WEBDEV RWDOracleWINDEV MobileWeb services
Developer
Ludendo
April 2016 - August 2016
Creation of product management software for franchises.
WINDEVSQL Server
Developer
Lucart
January 2016 - April 2016
Application maintenance on WINDEV and AS400 environment.
WINDEVAS400
Developer
Insurance broker
June 2015 - December 2015
Costing, auditing, technical documentation and application development.
WINDEV
WINDEV developer analyst
Isimedia
September 2013 - June 2015
WINDEV, WEBDEV and WINDEV Mobile developments for different clients.
Developer
VIVISOL
September 2014 - May 2015
Application maintenance on internal ERP.
WINDEV 16/17
Developer
Arvato
November 2013 - August 2014
Development with WINDEV, WEBDEV and WINDEV Mobile.
WINDEVWEBDEVWINDEV Mobile 18/19
WINDEV Developer
houra.fr
June 2013 - August 2013
WINDEV application development.
WINDEV developer analyst
Sysprog
March 2013 - June 2013
Internship and first professional experiences in WINDEV development.
Self-employed
Loulou Soft
January 2012 - June 2013
Creation of tailor-made software with WINDEV, WEBDEV and WINDEV Mobile.
WINDEV Developer
Sogi Informatique
2010 - 2011
First experiences in WINDEV development.
Products online
My products online
Beyond client missions, I design and put digital products online, alone or in partnership. These projects allow me to experiment, build, maintain and improve real applications, accessible in production.
Online
Web application / online tool
SimpleTransfer
An online solution designed to simplify everyday digital exchanges.
SimpleTransfer is an independent web product created by Louis Planquart. It illustrates an approach focused on simplicity, accessibility and rapid production of a digital service.
Personal productWeb appSaaSUser experienceOnline application
Online
SaaS application
Monalyra
A modern SaaS application designed for a simple and accessible user experience.
Monalyra is a live application created by Louis Planquart, developed as a personal SaaS product with a modern, premium and scalable experience.
SaaSPersonal productWeb applicationModern experienceIndependent creation
Online
Interactive web application
BingoLive
An interactive online experience around the game, accessible directly from a browser.
BingoLive is a web application created by Louis Planquart. It demonstrates his ability to design interactive, accessible and user-focused digital experiences.
Web appInteractivePersonal productBrowserIndependent creation
Online
SaaS application / AMOA assistant
AskLeopold
A multi-company AMOA assistant designed to frame, structure and transmit business projects.
AskLeopold is an application co-created by Louis Planquart and Jean-Francis Ochs. It brings their field experience to the framing and structuring of business requirements.
In partnership withJean-Francis Ochs
SaaSAMOA AssistantMulti-companiesCo-creationBusiness framing
Blog & feedback
Field notes on tech, products and IS
Here I share concrete feedback on application architecture, DevOps, information systems integration, business applications, applied AI and the construction of digital products.
AI & industrialization
AI applied to development
Louis uses and explores AI tools to accelerate development, documentation, analysis and the delivery of technical projects. His approach remains pragmatic: AI is an accelerator, while production constraints, code quality, maintainability and real-world information systems remain central.
Use of Codex and AI agentsExperimenting with local models with OllamaDocumentation generationDevelopment aidDesign assistanceTask automationStructuring technical projectsRapid prototypingReflection on AI uses in business
Assisted development
Accelerate code production, reviews and understanding of existing code without delegating technical responsibility.
Accelerated Documentation
Transform exchanges, analyzes and technical rules more quickly into supports that can be used by teams.
Product prototyping
Quickly test an idea, frame a UX and validate the first hypotheses before industrializing.
Technical automation
Identify repetitive tasks and create assistants or scripts useful for delivery and support.
Monitoring and experimentation
Monitor the concrete uses of AI in IS projects, development and digital products.
Services
What I can bring
Targeted services to strengthen a project, secure an existing one, modernize an application or structure a product.
Audit and modernization of business applications
Analyze the existing situation, identify weaknesses, prioritize developments and propose a realistic modernization trajectory.
WINDEV / WEBDEV / WINDEV Mobile development
Create, maintain or develop specific business applications in the PC SOFT ecosystem.
Application architecture
Structure application components, clarify responsibilities, secure dependencies and improve maintainability.
information systems integration and middleware
Connect applications to each other via API, webservices, files, middleware or automated processing.
ERP / IFS Cloud
Support configuration topics, workflows, interfaces, rights, tests and support around IFS Cloud.
Technical framework and documentation
Transform a vague need into a structured, documented, testable and manageable subject.
Lead Tech Reinforcement
Provide senior technical support on complex projects, teams under pressure or high criticality subjects.
Creation of MVPs and SaaS products
Help design, develop and release a usable digital product.
Application support and production
Analyze incidents, stabilize flows, make tools more reliable and improve quality of service.
Method
A pragmatic, production-oriented method
Each mission is approached with a field reading: understanding the existing situation, clarifying the risks, moving forward in stages and delivering something usable.
To understand
Analysis of the context, uses, technical constraints, business irritants and existing dependencies.
Structure
Formalization of the need, division, prioritization, clarification of responsibilities and identification of risks.
Build
Development, integration, configuration, automation or resumption of the existing depending on the context.
Test
Recipe, controls, non-regression, documentation and validation with stakeholders.
Sustain
Documentation, knowledge transfer, continuous improvement and secure maintenance.
My goal is not just to deliver a feature, but to produce a solution that is understandable, maintainable and useful over time.
Differentiation
What sets me apart
My background allows me to make the link between the field, users, technical teams, integrators and management. I understand the production constraints, business continuity issues, technical debt, dependencies on legacy tools and the need to progressively modernize without weakening the existing system.
Technical and business vision
Ability to understand both user needs and the technical reality behind the systems.
Experience in complex information systems
Accustomed to nested application environments, critical flows, ERP and historical applications.
Production culture
Attention paid to stability, supervision, documentation and the real impacts of changes.
Ability to take over the existing
Analysis, understanding, security and progressive improvement of systems already in place.
Entrepreneurial culture
Creation of independent or partnership digital products, with a logic of putting online, real use and continuous improvement.
Pragmatic approach
Prioritize what brings value, reduce unnecessary complexity and move forward in controlled steps.
SKILLS
Technical skills
A technical base oriented towards business applications, information systems integration, ERP, industrialization and creation of online products.
Application development
WINDEVWEBDEVWINDEV MobileHFSQLSQLC#JavaScriptTypeScript
Databases
SQL ServerOracleHFSQLAS400Stored proceduresSQL QueriesModelingOptimization
information systems integration
BluewayREST APIWeb servicesJSONXMLSFTPMiddlewareLogsSupervisionFlow automation
ERP and business tools
IFS CloudIFS 24R1IFS 25R2WorkflowsProjectionsQuickReportSettingsScreensApplication rights
Management and method
Functional analysisTechnical frameworkEncryptionDocumentationRecipeSupportBusiness / IT coordinationContinuous improvementNon-regressionSupport for change
Product and SaaS
MVPWeb productSaaSUXPut into productionProduct maintenanceRoadmapTechnical SEO
AI and automation
CodexAI AgentsOllamaLocal modelsDocumentation generationAssisted developmentAutomationPrototyping
Ground
Field experience of real systems
I regularly intervene in contexts where the existing situation is complex, poorly documented or strongly intertwined with business processes. My role is to restore clarity, secure flows, understand dependencies and propose realistic solutions.
Resume without breaking
Understand an existing situation, identify dependencies, avoid regressions and gradually evolve.
Connect systems
Make exchanges between internal applications, ERP, SaaS tools, files, API and middleware more reliable.
Structuring requests
Transform business needs into framed, documented, prioritized and testable subjects.
Contact
Let's discuss your project
Available for freelance missions, technical support, audit, application modernization, information systems integration or digital product creation.
You can also contact me to discuss an application need, an IS project or a digital product.