Skip to contentArthur Costa gossip · five rounds, fanout two
round 0 · one node learns the news
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Animated portrait: one cell at my eye learns a piece of news; every round each informed cell tells two random cells, which reveal their part of my photo. A final anti-entropy pass repairs the stragglers and the portrait holds on my avatar.
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round 1 · the news, and where I heard it
What I built, and where it spread
Two lanes: work for employers and clients (never named), with the records it produced, and what I built on my own time. Each block leads with its outcome. A technology learned in one place travels to the next: pick one and its chain of transmission is drawn across the page, each stop numbered by the round it arrived in.
Trace
At work · roles, and the records they produced
On my own time · decision records
round 2 · how I pass it on
Word of mouth, and in the open
Gossip works because nobody waits for a coordinator: each node tells a few peers, and they tell a few more. This is how I pass things on: to people, to other projects upstream, and through what I build on my own time.
Told upstream
Smaller and earlier work, on my own time
round 3 · anti-entropy
The full state a rumour misses
Rumours carry headlines; anti-entropy carries the full state: how I work, what I work with, and the rest.
What every node repeats
round 4 · your turn
Join the cluster
A node joins a gossip cluster by contacting any member it knows. These are mine; I read messages on both.
What you have heard of me: each round you read fills in a fifth of the portrait.
Why this design
Concept: gossip, after Demers et al. (1987), is how fleets spread news without a coordinator, and it is how knowledge spreads between people, so this page reads like a rumour: the seed first, then the news, then the people who passed it on.
Information architecture: each section is a node in a five-round epidemic; reading a section informs it, and it tells two peers, the next round and one chosen at random, which you see as links at its foot and as arcs in the rail. "Pull what I missed" is anti-entropy: it takes you to the first round you have not read.
The first screen is round 0 to round 2: the seed in the middle, my portrait, tells the four results, two per round, and the edges you see are those messages; on a phone the portrait stays in the first screen.
The portrait returns twice: in the rail, a fifth of it fills in for each round you read, scattered at random like gossip coverage, and at the end it shows how much of me has reached you.
Below the first screen the mechanism keeps shaping the layout: round 1 is not a card grid but a network, two threads of nodes, work and own time, and tracing a technology draws its chain of transmission from node to node across the entries you are reading, numbered by round. It uses only the stacks and roles written in my records.
Type: DM Sans for everything you read, DM Mono for counts, ids and rounds from the same family, and Caveat only where a message is passed ("told in round 1" beside each result, "round N" on a traced chain), because gossip is word of mouth but the numbers must not look scribbled.
Colour: warm paper and near-black ink, with spruce green as the single accent for a message or a node that knows.
Motion and accessibility: in the portrait each message is a short arc to a nearby cell (a dot for the rare distant peer) and nothing crosses the face once it is known; rounds pace at 380 ms, the portrait plays once and holds, "Pause animation" stops everything and then reads "Resume animation", reduced motion shows each end state, every graphic has a text version beside it, and nothing about you is stored.
1 of 5 rounds heard
Complete profile
Senior backend & platform engineer · Porto, Portugal
I build platforms that hold up in production: moving fleets to the cloud, turning batch into event streams, and, on my own time, execution platforms and safety tooling for coding agents.
Open to senior backend or platform roles, remote or hybrid
Nine years in production (since 2017)
Decision records
2023–2025 · At work · Platform · Delivered
200+ instances to cloud local zones, with autoscaling
Compute cost fell by ~70% across 200+ instances.
~70% lower compute cost — 200+ instances moved from on-prem and edge sites to cloud local zones, with autoscaling
200+ instances migrated — with autoscaling, for live sporting-event peaks
Context and decision
Context. A real-time platform for live sporting events ran its workloads on on-prem and edge environments.
Decision. Lead the infrastructure modernization: migrate the workloads to cloud local zones and enable autoscaling, with multi-region load tests before peak events.
Stack. Cloud local zones · Autoscaling · Go · Python · Locust
2022–2023 · At work · Payments · Delivered
Payment settlement, from batch to event-driven
Processing success rose from 60% to 90%+.
60% → 90%+ processing success — payment settlement moved from batch to event streams with change data capture
Context and decision
Context. A legacy payment and settlement platform ran as batch processing on a monolith.
Decision. Move the core components to Java and Go, replace batch with streaming and change data capture, containerize on Kubernetes, and centralize logs and dashboards for the SLAs.
Stack. Java · Go · Streaming · CDC · Kubernetes
2026 · Own time · Platform · Working system
Horus: remote execution for builds and agent jobs
A changed worktree is a new job, never a silent retry; a worktree without a data class never leaves the machine.
Context and decision
Context. Builds and coding-agent jobs start on a workstation but need the CPU, isolation and uptime of a remote fleet, without leaking a private worktree or losing work halfway.
Decision. A local daemon with a socket API and a written durability contract; content-hash sync so a job runs on exactly the bytes submitted; recovery bound to that content; a versioned accounting ledger; gVisor sandboxes on VPS runners behind a data-class gate.
Stack. Go · Rust · gVisor
2026 · Own time · Virtualization · Spike
Firecracker microVMs as a sandbox compute driver
A failure-injection suite on a KVM host (kill mid-create, simulated reboot, duplicate RPCs, kill points 0–50 ms, a leak counter) and 23 security probes on a 22-item adversarial matrix. An unimplemented check reports SKIP, never PASS. Proposed upstream as OpenShell#4351.
Context and decision
Context. Can Firecracker microVMs, with the jailer, back an open-source agent sandbox runtime (OpenShell) through the whole lifecycle, and stay correct when things crash?
Decision. A compute driver with its own guest kernel, images from a verified catalog, reclamation of the previous run's VMs at start-up, and a guest flush before Stop.
Stack. Go · Firecracker · KVM
2026 · Own time · Platform design · Accepted
Retire my own agent platform; keep the native clients
Far less to operate; contribution rules now refuse new routers, schedulers and dashboards.
Context and decision
Context. My agent-workflow repository had grown a router, a scheduler, a coordinator hierarchy, a provider dispatcher and a dashboard in front of three coding-agent clients.
Decision. Retire it (19 October 2026). Each client runs natively; the repository keeps shared skills, a small configuration, standalone safety tools and 26 dated decision records.
Stack. Python · Bash
2026 · Own time · Platform safety · Accepted
Safety tools fail closed
Documented as a tripwire, not a sandbox, so nobody mistakes it for isolation.
Context and decision
Context. Coding agents run shell commands in real repositories from three clients with three hook systems; secrets once reached a model through process arguments.
Decision. One command-safety hook for all three clients; output redaction; long-lived credentials kept out of worker reach; a missing safety dependency refuses instead of being caught and allowed.
Stack. Python
2026 · Own time · Distributed systems · Lab
Course labs on microVMs, behind an mTLS control plane
A lab's user id stays reserved until its cleanup has succeeded; CA rotation cannot be bypassed by session resumption.
Context and decision
Context. A course platform gives every learner a disposable lab machine, created and destroyed constantly by many people at once.
Decision. A microVM lab runtime with a chaos test that kills VMs mid-session; idempotent resets by key; mutual TLS on a control-plane CA with reload without restart; pinned keyless signing that fails closed.
Stack. Go · Kotlin · protobuf
2026 · Own time · Storage & consensus · Study
A relational database, from storage to Raft
Built layer by layer as a study; each phase is a commit history.
Context and decision
Context. The fastest way to understand a distributed database is to build its layers in order and see where each guarantee comes from.
Decision. Disk manager, buffer pool, B+ tree, heap file and write-ahead log; SQL parser, planner and Volcano executor; 2PL then MVCC; Raft, Multi-Raft with range sharding, Percolator-style transactions, SSI with hybrid logical clocks, an S3 backend and the PostgreSQL wire protocol.
Stack. Rust
2026 · Own time · Sync & security · Working system
Offline-first sync with signed form-fill
The extension never fills a form the owner did not approve.
Context and decision
Context. A personal job-search tool runs on several desktops plus a browser extension; data must sync without a central source of truth.
Decision. Tombstones pruned only once every active desktop has applied them; fill tokens signed on the desktop with a P-256 key from the OS keyring; an encrypted vault export; an LLM judge measured against blind readings.
Stack. Go · Rust
2025–2026 · Own time · Developer tooling · Shipped v2.1.1
gitshift: many Git identities, one machine
Switching on a directory change went from about 3.8 s to about 0.5 s.
3.8 s → 0.5 s directory switch — gitshift identity switch on directory change, release v2.1.x
Context and decision
Context. Several GitHub and GitLab accounts on one machine means juggling keys, identities and signing by hand.
Decision. One command switches Git author, SSH key, commit signing and the GitHub CLI account, by alias or automatically by directory; releases through GoReleaser and a Homebrew tap.
Load tests to inform cost optimization and Kubernetes autoscaling; graceful shutdown and connection draining in a shared Helm chart; CI repaired with quality gates; codebase rules for agentic coding, shared with the team.
Software engineer, platform / backend
2023–2025 · Real-time platform for live sporting events
Led the move of on-prem and edge workloads to cloud local zones with autoscaling (AC-001); real-time, event-driven services on serverless and containers; Go and Python automation; Locust multi-region load tests for peak events; CI/CD across GoCD, GitHub Actions, Jenkins, Buildkite, Ansible and Packer; metrics, logs, traces and alerts.
Software engineer, payments / settlement
2022–2023 · Payment and settlement platform (consulting)
Led the modernization of a legacy payment and settlement platform to event-driven streaming and CDC (AC-002).
Software engineer, post-purchase
2021–2022 · E-commerce marketplace, several countries
Backend services in Go, Java, Node.js and Groovy for post-purchase and payment workflows; faster claim and dispute resolution.
Software engineer
2019–2021 · Core banking, Brazil
Monoliths and mainframe-based systems modernized into Java and Spring microservices; migration of microservices to the public cloud under regulatory SLAs.
Associate software engineer, CRM & integrations
2018–2019 · Fintech CRM
Real-time CRM features integrated with banking services such as loans, OTP and account management.
Associate software engineer
2017–2018 · Software house
CRM and warehouse management systems in PHP and JavaScript.
How I work
Fail closed: a missing safety dependency refuses; it is never caught and allowed.
Crash and recovery suites before claims: kill mid-create, simulated reboots, leak counters.
Evidence tied to a commit; a check that is not implemented says SKIP, never PASS.
Decision records for every significant choice, including retiring my own platform.
Load tests before peak events.
Also built
Drover
Watch and approve agent sessions from any device: a Rust core over UniFFI, pairing scopes bound to the consumed token.
Rust
JVM performance labs
Eleven on-heap versus off-heap lock-free scenarios with JMH, and 13 serialization frameworks behind one endpoint. Numbers not quoted until re-run with raw output.
Java · JMH
graphql-federation
Federation 2 across Java, Go and TypeScript subgraphs, gRPC between services, SLO burn-rate dashboards.
Java · Go · TypeScript · gRPC
Ponte
A management system for tutoring schools: live lessons with recording and consent, TOTP and lockout, a finance ledger ported to Go and checked by replaying a shared corpus.
TypeScript · Go · PostgreSQL
deep-engineering-knowledge-base
An LLM pipeline that writes and checks engineering lessons, with an independent critic that excludes the author.
Python
techish-visual
An engine for animated technical diagrams: a ThorVG WASM renderer and performance budgets in CI.
TypeScript
keyframe
A Linux studio for recording and editing technical videos, with cuts snapped to silence.
Rust
java-workflows
Reusable GitHub Actions for Java teams: a Java 11 to 25 matrix, security scanning and SBOMs.
GitHub Actions
Upstream
OpenShell#4351
Firecracker compute driver proposal, from AC-004 (open source). · open
OpenShell#4591
A gateway reporting "database is locked" under two concurrent clients. · open
Orca, 10 pull requests
SSH OAuth forwarding, pairing-offer rotation without restart, security events, isolation from external agent config. · 9 open, 1 closed