Senior Software Engineer
Hands-on Tech Lead · Somos Educação / Cogna
Adroaldo
Pagliari.
I’m a Senior Software Engineer and hands-on Tech Lead at Somos Educação / Cogna. I design, build, and operate assessment and reporting backends across AWS, event-driven processing, PostgreSQL, and ClickHouse. I apply AI to engineering investigation, documentation, and learning, and work on LLM-enabled backend capabilities.
Selected work
Answer sheet generation at scale
Asynchronous document generation, bounded work, and recoverable batches.
Read case studyAssessment reporting across PostgreSQL and ClickHouse
Separating transactional and analytical concerns while keeping freshness and cost explicit.
Read case studyAI-assisted engineering with explicit review
Agents for investigation, documentation, and learning, with visible evidence and authority.
Read case studyAll work and earlier experience
Before education technology, I founded a company building industrial ERP software, worked on manufacturing integrations, and contributed to medical imaging systems. That experience still shapes how I approach domain complexity and long-lived software.
Backend Study Lab
Practice architecture decisions with evidence, competing hypotheses, and a review rubric.
A runnable demonstration with synthetic backend scenarios. The browser version runs locally without an API key. Downloadable source includes a model-adapter contract and evaluation suite.
Engineering notes
What a PDF generation pipeline taught me about batch processing
Bounded work, status models, retries, and why the last 1% of a batch often needs the most attention.
2 min read · Read articleDatabasesChoosing a reporting database is a workload decision
How I think about PostgreSQL, analytical queries, concurrency, freshness, and cost in reporting systems.
2 min read · Read articleAI engineeringApplying backend engineering habits to AI systems
Starting with a baseline, drawing tool boundaries, and evaluating quality alongside latency and cost.
2 min read · Read articleLearning systemsBuilding agents to study advanced backend architecture
A repeatable way to turn codebases, incidents, and source material into evidence-backed learning and difficult exercises.
2 min read · Read articleAI engineeringThe harness matters more than a clever prompt
Context assembly, tool contracts, verification, and evaluation for agent-assisted software engineering.
2 min read · Read articleHow I work
I’m a senior software engineer who still writes code while leading backend architecture and mentoring teams. My experience spans industrial software, system integration, and large-scale education platforms.
At Cogna / Somos Educação, I lead technical work for assessment and reporting squads on platforms serving more than three million students. I work primarily with Node.js, TypeScript, NestJS, AWS, PostgreSQL, SQS, RabbitMQ, Redis, and ClickHouse. I care about throughput, failure modes, observability, maintainability, and cost.
I apply AI to my own development process and work on LLM-enabled backend capabilities. I’m especially interested in agents, evaluation, tool boundaries, and the architecture needed to make AI systems dependable. I hold a B.Sc. in Computer Science and a postgraduate degree in web, cloud, and mobile development.
Project descriptions are deliberately high level and exclude internal implementation details.
Career
- 2021–present · Somos Educação / CognaSenior Backend Engineer / Tech Lead; assessment and reporting.
- 2020–present · MerittBackend Engineer / Team Leader.
- 2018–2020 · Integration and independent workIndustrial systems at Decode21 and end-to-end web solutions.
- 2012–2018 · Doppler SistemasFounder & Technical Lead of an industrial ERP company.
- 2009–2011 · VisionMed and SenmaxMedical imaging and industrial ERP.
Get in touch
For engineering conversations, collaboration, or opportunities, use any of the channels below.