JOSÉ LUCAS DA SILVA / SOFTWARE DEVELOPER
Between systems and intelligence.
C#, Flutter, APIs and LLMs. I build tools, connect systems and work on what happens behind the interface.
Selected work01 / TECHNOSERV
Contributions at Technoserv. Team-built products; these are the areas I work on.
Implemented and evolved Technoserv’s knowledge management module: articles, editing, navigation and permissions. Content organization includes change planning, transactional writes and concurrency controls.
Article organization is planned before writing. Permissions are revalidated in the database and concurrent changes are checked within a transaction. This Codex is the Technoserv module, not the OpenAI agent.
CONTRIBUTION TO A TEAM PRODUCTBuilt chat experiences with streaming, form context, cited sources and tool activity. On the web, implemented an experimental generative UI layer with typed components and fallback rendering.
On the backend, contributed to separating engine, application, transport and adapters. Client work includes streaming deltas, cancellation, sources and screen context. Generative UI is experimental, not a claim of production deployment.
CONTRIBUTION TO A TEAM PRODUCTContributing to Flutter architecture and commercial workflows integrated with the ERP. Dependency injection, authentication, session context and API recovery, with isolation between screen edits and pending writes.
Architecture work includes dependency injection, use cases and authentication context. Pending requests must not inherit subsequent screen edits. API recovery and cache are not presented as offline-first operation.
CONTRIBUTION TO A TEAM PRODUCTModernized data mappings and built an independent email API with validation, limits and cancellation. Also implemented hash-based catalog synchronization and checks for distribution integrity and build identity.
Explicit DTO-to-entity mappings, defensive version copying and contract regression tests. The email service has concurrency limits, validation and cancellation; SMTP acceptance does not guarantee delivery.
CONTRIBUTION TO A TEAM PRODUCTProprietary software. Summarized descriptions; no source code, endpoints or customer data.
02 / PRACTICE
Existing business rules, integrations that must keep working and code that needs to evolve. C#, .NET, WPF, SQL Server and APIs.
Implemented multi-provider abstractions, streaming and an independent .NET AI foundation. Integrated MCP tools with authorization by user, content and license. Also contributed Langfuse observability and feedback integration.
Flutter on mobile, TypeScript on the web and .NET services behind them. The stack follows the problem, not the other way around.
03 / INDEPENDENT
Problems that interest me outside work, too.
FILMS / SHOWS / PRIVACY
A private shelf of films, shows and anime for a group. Progress, ratings and recommendations without another endless feed.
DISCORD / RESEARCH / LLMs
A Discord bot for research, studying and coding. Conversation context, configurable providers and tools for organizing work and researching sources.
04 / WHO’S HERE
I’m José Lucas, a developer in Maceió, Brazil. I have worked with software for over five years. At Technoserv, my work spans business systems, mobile and applied AI.
I like architecture, understanding how systems work and fixing what holds an operation back. I prefer a solution I can explain, maintain and measure over a stack chosen for its popularity.
2022 — PRESENT
Mid-Level Systems Analyst. ERP, B2B applications, services and applied AI.
2020 — 2022
Android applications, .NET APIs and an Angular portal.
EDUCATION
CESMAC, since 2025. Web Development at IFAL, 2018–2022.
05 / CONTACT
For a conversation about software, an opportunity or a project.