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Open to any background, anywhere in the world.
Apply: https://t.co/DTQBAzgQug
You've been using Linux for years. But you're still doing things the hard way.
Here are 7 commands that'll save you hours on terminal
1. Forgot to add sudo?
- Type `sudo !!`
- It repeats your last command with sudo. No retyping.
2. Just created a file?
- Use `vim !$` to open it.
- The !$ grabs the last thing you typed.
3. Can't remember that command?
- Press Ctrl + R and start typing.
- It searches your entire command history.
4. Made a typo in a long command?
- Type `fc`
- It opens your last command in an editor. Fix it and save. Done.
5. Jumping between folders?
- Use pushd /some/path to save a location.
- Use popd to go back.
- No more typing long paths over and over.
6. Want to see your folder structure?
- Type `tree -L 2`
- Shows everything like an actual tree. Much cleaner than ls.
7. Need to go back to your last folder?
- Just type cd -
- Takes you right back. Simple.
Bonus:
Stop writing `cat file | grep something`
- Just write `grep something file`
- Does the same thing. Way cleaner.
I've used Linux for years. These small commands save me time every single day.
Bookmark this. Your future self will thank you.
Since last 2 days I was exploring this GitHub repo. It contains Production-grade Go microservices repo worth studying
Link: https://t.co/wp37hTz3Y8
Here are some key learnings that I found informative to devs like me:
- Vertical Slice Architecture - feature folders, not layers
- CQRS + Go-MediatR - clean separation, pipeline behaviors
- Event-driven with RabbitMQ - async communication
- OpenTelemetry + Jaeger - distributed tracing
- gRPC for inter-service calls
- uber-go/fx for dependency injection
- Full test coverage (unit/integration/e2e)
It shows how to minimize coupling and maximize cohesion in real microservices.
Live Debugging Techniques for the Linux Kernel, Part 1 of 3
https://t.co/EECnYo2yR0
Live Debugging Techniques for the Linux Kernel, Part 2 of 3
https://t.co/R447vK5M0f
Live Debugging Techniques for the Linux Kernel, Part 3 of 3
https://t.co/UKA9N9Yot2
Ledger before UI update
Idempotency everywhere
Rate limit everything
Tokenize sensitive data
Message queues for money flows
Version APIs strictly
Feature flags for risky releases
Canary deploy financial changes
Rollbacks must be instant
High chaos testing
Double-entry ledger invariants (debits = credits, always)
Reconciliation jobs daily (and on-demand) against processor/bank statements
Immutable audit trail for every state change (who, what, when, why)
Separate authorization vs capture vs settlement states (never “one status”)
Never trust client inputs for money amounts, currency, or fees
Validate currency + rounding rules explicitly (minor units, bankers rounding, etc.)
Use strong id keys for external providers (dedupe webhooks + retries)
Store raw webhook payloads + signatures for dispute/debugging
Exactly-once is a myth, design for at-least-once with dedupe
Outbox pattern for publishing financial events reliably
Backpressure and circuit breakers around payment providers
Strict timeouts + bounded retries (with jitter) for external calls
Manual review lane for high-risk actions (limits, velocity, anomaly triggers)
Principle of least privilege for IAM, DB, queues, and secrets
Encrypt PII at rest + in transit, and rotate keys regularly
Secrets never in env files in prod; use a secrets manager + rotation
Data retention policies (PII deletion, log retention, legal holds)
Separate prod vs non-prod credentials and accounts (no shared anything)
Access logs for admin actions and privileged reads (PII access included)
Auditability: every balance must be explainable from events + ledger entries
Compliance-ready logging: structured, correlation IDs, no sensitive payloads
Pen tests + threat modeling before major launches
Regular security reviews + dependency scanning in CI
Fraud controls: device fingerprinting, IP reputation, behavioral signals
Limits everywhere: per user, per account, per instrument, per time window
Disaster recovery drills (restore DB, replay events, reconcile balances)
SLOs for critical flows (authorize/capture/withdrawal), alert on user pain
“Break glass” procedures for incidents (with audited access)
Independent auditor-friendly artifacts: policies, runbooks, diagrams, controls
Periodic internal audits of controls + access + reconciliation outcomes
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