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Diogo Mendonça

Open to work7 years experience

Senior Software Engineer

Brazil (Remote)Target Roles: Backend Engineer • Full-Stack Developer • Frontend Specialist

Senior Software Engineer specializing in React, TypeScript, and Go for fintech and DeFi.

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Standing Rank

Rank Not Available

Developer Badges

Badges Pending

Skills & Technologies

36 skills
reacttypescriptnext.jsjavascripthtml5css3tailwind csschakra uigolangnode.jsexpress.jspostgresqlmongodbredisprismarest apiswebsocketsgraphqlgrpctrpctanstack queryjotaireduxzodrechartsjestcypressethers.jsviemwagmisoliditydockernginxgitci/cdfigma

Work Experience

Senior Full-Stack Engineer

Katana

Nov 2025 - Apr 2026 Remote
  • Delivered an end-to-end email campaign system spanning backend services and frontend flows, driving 40K+ double opt-in confirmations in the first 48 hours of launch.
  • Built an AI-powered agent skill using Claude and ChatGPT Codex that generates pixel-accurate UI designs from app standards and designer specs, accelerating feature design and prototyping by 3x with light token consumption.
  • Executed a large-scale codebase refactoring — removing dead HTML, extracting duplicated patterns into reusable components, and applying the strategy pattern to repetitive logic — cutting build time in half and improving long-term maintainability.

Lead Frontend Engineer

Fjord Foundry

Jan 2025 - Oct 2025 Remote
  • Led architecture and code review for a team of five frontend engineers, establishing standards that cut production incidents by 40% and increased weekly PR throughput by 60%.
  • Shipped Go backend endpoints alongside the core backend team, co-designing API routes and data flow for new product features end-to-end.

Senior Frontend Engineer

Fjord Foundry

Jun 2023 - Dec 2024 Remote
  • Spearheaded Launchpad integration for Liquidity Bootstrapping Pools using Next.js, TypeScript, and wagmi, supporting 100+ token launches with $1.5B+ in cumulative volume.
  • Architected a multi-chain token swap system using React and TypeScript, enabling seamless cross-chain transactions across 10+ networks via SquidRouter and LI.FI.
  • Reduced page load from 10 seconds to sub-second via Next.js SSR with a hybrid caching layer — Redis for frequently-changing data, Next.js cache for static content, plus background revalidation and lazy-loaded components — making navigation feel instant.

Senior Full-Stack Engineer

Kayen

Mar 2024 - Aug 2024 Remote
  • Led migration of the Express.js backend from JavaScript to TypeScript, reducing production runtime failures to near zero through end-to-end type safety.
  • Drove a GraphQL performance overhaul — replacing raw calls with a typed client, introducing caching strategies, and eliminating redundant queries — reducing response times for frequent tasks from minutes to milliseconds and shipping the full fix in one week.

Full Stack Engineer

Diablo Trade

Sep 2023 - Apr 2024 Remote
  • Solo-built a full-stack trading platform with React, Next.js, Golang, and WebSockets, supporting real-time listings, exchanges, and live chat for 30,000+ active users.
  • Engineered a composable AND/OR search system across frontend and backend — React + Jotai on the UI, MongoDB aggregation pipelines with index-aware query composition on the backend — enabling users to build complex queries over 1.5M+ item records with sub-second response.
  • Migrated infrastructure from DigitalOcean to OVH, reducing hosting costs by 70% while scaling concurrent real-time user capacity from 500 to 4,000.

Frontend Engineer

Concave

Aug 2021 - May 2023 Remote
  • Built staking and NFT marketplace interfaces for a DeFi protocol using React, TypeScript, Chakra UI, ethers.js, and Redux, contributing to core product surfaces and user engagement flows.
  • Shipped airdrop campaign flows with merkle tree-based whitelist verification using merkletreejs, enabling eligible wallets to claim pCNV and related token distributions.
  • Developed a treasury transparency dashboard surfacing on-chain treasury data from Dune Analytics via React Table, giving the community real-time visibility into protocol holdings.

Projects

Projects Not Populated

Personal applications, open-source work, and code repos will show here.

Leaderboard Standings

Leaderboard Position Pending

Global test scores, peer standing percentiles, and algorithm leaderboard ranks are updated dynamically.

Assessment Highlights

Assessments Not Completed

Coding evaluations, system assessment results, and conceptual score badges will appear here after taking a test.

AI Collaboration Score

AI Collaboration Score Pending

Developer coding behavior, assistant cooperation, and AI pair-programming indicators are evaluated during live coding sessions.

Role Compatibility Profile

Role Compatibility Analysis Pending

Custom matching reports, candidate role compatibility percentiles, and core engineer strength profiles are processed once conceptual code screenings are complete.

Achievements

Wagmi Contributor

Contributor to the React Hooks library for Ethereum (5,000+ stars).

Surf Contributor

Contributor to a TypeScript-first smart contract interaction library for Aptos (Move VM).

About Details

Professional Bio

Senior Software Engineer with 7+ years building high-performance React, TypeScript, and Go applications across fintech and DeFi platforms. Delivers scalable APIs, real-time systems, and production-grade frontends with a track record of reducing load times and cutting infrastructure costs.

in Software Engineering

Self-Directed Study ( - Present)

Languages: English, Hindi
Email: Locked