DEVANDRADE TECH brand DEVANDRADE TECH

DEVANDRADE TECH Java and Kotlin backend for financial and high-volume systems

Hands-on consulting for slow queries, flaky messaging and flows that can't get the math wrong.

Talk to Vinícius See results

Critical reconciliation query

14 min → 7 s

120× faster · interbank card settlement

See how it was done

In real timePaused

Services

From the API contract to production

Hands-on work in the code and the architecture, inside the client's team.

  • Backend development

    Java and Kotlin services shipped with tests, observability and cloud deployment.

    Spring Boot · Spring AI · Docker · Kubernetes · AWS · Azure · GitHub Actions · GitLab CI

  • APIs & Messaging

    Versioned contracts and integrations with idempotency and retries built for real failures.

    Kafka · IBM MQ · AWS SNS/SQS · Azure Service Bus

  • Performance & Data

    Query tuning guided by the execution plan, the right indexes and no N+1 bottlenecks.

    SQL · PostgreSQL · DB2 · MongoDB · Redis · Datadog · Grafana · OpenSearch

  • Financial systems

    Settlement, reconciliation, payroll-deductible credit and benefits, with precision and traceability.

    Camunda · Spring Security · Testcontainers · Pitest

Results

Before and after

Numbers from recent projects, each with its context.

  • 14 min → 7 s

    Critical reconciliation query on an interbank card settlement platform

    120× faster

  • < 3 s

    Query with an N+1 on the same settlement system

    No new index

  • Manual → automatic

    Dataprev duplicate error when registering payroll-deductible loans

    No more manual approval

  • ~160M orders/month

    Order events with end-to-end tracing, multi-region fanout and alerts on the golden signals

    Scale

  • 8 h → 30–90 min

    Document audit in the in-house SaaS, with OCR and AI

    5 to 16× faster

Own product · B2B SaaS

From backend to apps, in production

Beyond consulting, DEVANDRADE TECH builds and runs its own product.

In production · recurring revenue

Alpha Prime Gestão ECV

Document management and ISO 9001 audits for Brazil's accredited vehicle inspection companies (ECVs).

Document audit time
Manual
8 h
With OCR and AI
30–90 min
Platforms
Web · iOS · Android
Backend
Kotlin · Spring Boot
PIX settlement
Transactional outbox
Security
Fail-closed · LGPD

Discover Alpha Prime

Open source

Code reviewed in public

Every PR went through the maintainers' review. Each project page explains what each one fixed and why it matters.

Merged PRs
262
plus 14 under review
Projects with a merged PR
7
GitHub stars across those projects
664k
  1. Contribution akitaonrails/ai-memory Long-term memory for AI agents 109 merged PRs 15.9k stars
  2. Contribution akitaonrails/ai-usagebar AI usage quotas in the system bar 92 merged PRs 781 stars
  3. Own project viniciusdsandrade/leis Every Brazilian law as plain text 45,981 laws addedCampinas (SP), 1893 to 2026, and Nova Friburgo (RJ) derived from ctresb/leis
  1. tw93/Mole macOS cleanup and maintenance 26 merged+5 under review 75.1k stars
  2. morluto/rea Reverse engineering for AI agents 16 merged+1 under review 460.0k stars
  3. simbasjungles/free-my-tv Ad-free home screen for TVs 16 merged+1 under review 6.4k stars
  4. rtk-ai/rtk Fewer AI tokens in the terminal 2 merged+7 under review 86.6k stars
  5. ccusage/ccusage AI token usage and cost 1 merged 19.4k stars

GitHub activity · past year

9,491 contributions in this period
View full profile on GitHub →

Telemetry · WakaTime

Continuous practice, measured

Real editor and terminal time, measured by WakaTime and updated daily.

4h 37m a day on average over the past year 4.1× the WakaTime user average (1h 7m)
341 of 365 days with code over the past year 55-day streak now, longest 56
1,829+ h in Java and Kotlin
4,317+ h of code in total
68h 41m over the last 7 days · Nov 8 to 14
  1. Sun, Nov 8: 7h 6m
  2. Mon, Nov 9: 10h 36m
  3. Tue, Nov 10: 13h 3m
  4. Wed, Nov 11: 9h 57m
  5. Thu, Nov 12: 9h 37m
  6. Fri, Nov 13: 13h 32m
  7. Sat, Nov 14: 4h 47m
Current day
4h 47m
Sat, Nov 14
Daily average
9h 48m
over 7 days
Most active
Fri, Nov 13
top day · 13h 32m

Languages over the past year

  • Kotlin 32.6%
  • TypeScript 14.6%
  • Bash 10.2%
  • Rust 8.5%
  • Python 7.2%
  • SQL 5.7%
Where the time was measured

IntelliJ IDEA · 2,214 h

Where most of the code gets written: Java and Kotlin services, tests included.

AI agents · 1,632 h

Programming with agents in the terminal: Claude Code, Codex CLI, Grok CLI, AGY CLI, Kimi K3 CLI, GLM.

SQL · 205 h

Modeling, queries and execution plans in DB2 and PostgreSQL.

WakaTime measures only language and category. Client, repository and file names never come in. Figures refreshed daily.

About

About the founder

DEVANDRADE TECH is led by Vinícius Andrade, a backend developer based in Campinas, Brazil, with stints at iFood and Núclea. Currently working on payroll-deductible credit and on the settlement of a benefits payment scheme, and partner and technical lead of Alpha Prime.

Also maintains atuacao-publica, a transparency portal on the activity of Brazilian politicians from official sources.

Also an open-source contributor: 262 merged PRs across 7 projects, and maintains an independent edition of leis, the open archive of Brazilian law.

LinkedIn GitHub

Contact

Describe the problem.

You talk directly with Vinícius, who does the work.

[email protected]

Campinas, Brazil · remote work