Systems & Reliability Engineer | Distributed Systems · Data Infrastructure · AI Infrastructure · Open Source
I work on reliability and correctness problems across distributed systems, data infrastructure and AI infrastructure — backed by upstream contributions to projects including Apache SeaTunnel, vLLM, OpenTelemetry and Prefect.
Available for selected contract engineering & consulting engagements
Distributed systems reliability · Apache SeaTunnel integrations · connector engineering · production debugging · observability · AI infrastructure
Contract / consulting: info@pamilanga.com
Three focused engineering lanes, backed by public code, reproducible evidence and upstream review.
| Lane | Flagship | What it demonstrates |
|---|---|---|
| Systems & Reliability | PAMIR | Autonomous-system telemetry forensics, incident reconstruction and evidence-backed failure analysis |
| Developer Infrastructure | impactctl v0.2.0 | Deterministic change-impact intelligence across code, contracts, dependencies and ownership boundaries |
| Engineering Decision Infrastructure | bidlint v1.2.1 | Evidence-first technical bid compliance with provenance, supplier clarification workflows and fail-closed external-pilot gates |
| Signal | Evidence |
|---|---|
| Validated PAMIR baseline | v0.1: 5/5 public incident ULogs, 3/3 healthy controls, timestamp validation PASS, SHA256-pinned inputs |
| Upstream track record | 16 verified merged PRs across Apache SeaTunnel, OpenTelemetry C++, AIBrix/vLLM, Great Expectations, EFF Rayhunter and the ROS 2 ecosystem · Apache SeaTunnel: 7 merged upstream PRs |
| Public developer tooling | impactctl v0.2.0 · deterministic change-impact intelligence |
| Engineering decision tooling | bidlint v1.2.1 · stable release, real external supplier workflow and provenance-preserving compatibility validation |
| Current upstream work | vLLM Semantic Router, Polars, Prefect/Dask, OpenTelemetry gRPC, Grafana Tempo, lakeFS and xAI SDK |
| Applied assurance R&D | PAMIR-CUAS · PAMIR ARGUS · PAMIR IGNIS |
PAMIR — Tell me what failed first. And prove it.
Engineering principle — Evidence before confidence.
LinkedIn · PAMILANGA · PAMIR-CUAS · info@pamilanga.com
PX4 ULog → material root event → causal sequence → timestamped evidence
PAMIR is an offline forensic analysis engine for autonomous-system telemetry. It reconstructs an incident timeline, identifies the earliest material root event, and preserves evidence showing what happened next.
| Validation signal | v0.1 result |
|---|---|
| Public PX4 incident logs | 5 / 5 identified with a material root event |
| Healthy / control logs | 3 / 3 remained free of material root detections |
| Causal ordering | Timestamp-based validation PASS |
| Reproducibility | SHA256-pinned public benchmark inputs |
| Operation | Local / offline analysis |
Release: PAMIR v0.1.0
Repository: github.com/yigitcan-ozturk/pamir
Current direction: external validation against additional public PX4 ULogs and real-world telemetry, methodology review, and evidence-backed incident cases.
Sensor / C2 evidence → temporal integrity → evidence graph → counterfactual replay → causal finding
PAMIR-CUAS is a research prototype for vendor-neutral, post-test Counter-UAS validation and incident reconstruction. Given normalized sensor/C2 observations and independent ground truth, it reconstructs evidence lineage and tests whether timing faults, stale evidence, sensor disagreement, association or confidence transformation materially contributed to an incorrect outcome.
Current public prototype capabilities include:
- Causal Evidence Graph — trace observations, associations, transformations, fusion decisions and replay results through an inspectable evidence chain.
- Temporal Integrity analysis — identify stale, out-of-order and clock-offset evidence conditions.
- Sensor disagreement analysis — surface materially disagreeing observations for reconstruction.
- Counterfactual Replay — safely exclude or correct evidence offline and test whether the reconstructed outcome changes.
- Causal attribution reporting — distinguish evidence that materially changes an outcome from evidence that is merely correlated with it.
| Public synthetic case | Test-backed result |
|---|---|
| CUAS-001 | Stale RF evidence reproduced a false-positive path; excluding the stale evidence changed the reconstructed outcome |
| CUAS-002 | Sensor disagreement reproduced a false-positive path; excluding the disagreeing observation changed the reconstructed outcome |
These are synthetic, automated-test-backed research results. They are not claims of field validation, operational deployment, SSB approval or HARDKILL integration.
PAMIR-CUAS is validation infrastructure. It does not perform target selection, weapon control, engagement decisions, interceptor guidance, firing solutions or effector optimization.
Technical portal: cuas.pamilanga.com
Technical / integration enquiries: cuas@pamilanga.com
Observation → provenance → fusion → decision → first divergence → causal evidence → reproducible replay
PAMIR ARGUS is a separate R&D lane extending the PAMIR evidence philosophy toward assurance of autonomous defence-system decision chains.
Its core objective is simple:
Every autonomous decision should be reconstructable, explainable and reproducible as evidence.
ARGUS v0.1 focuses on an inspectable synthetic Radar + EO + RF → Tracker → Fusion → Decision chain and the evidence required to reconstruct how a system reached a decision, where the first meaningful divergence occurred, what evidence supports the reconstruction, and what remains uncertain.
The project is currently under development. It is not presented as field-validated, operationally deployed, certified, or integrated into any defence platform.
ARGUS is an evidence and assurance layer. It does not perform weapon control, target engagement, interceptor guidance or firing-solution generation.
| Project | Contribution |
|---|---|
| Apache SeaTunnel #12519 | RabbitMQ Sink queue_name declarative nonblank validation with focused factory regression coverage and bilingual documentation; approved by two reviewers and merged into dev |
| Apache SeaTunnel #12490 | TDengine declarative required-option validation, focused regression tests and bilingual documentation; approved by two reviewers and merged into dev |
| Apache SeaTunnel #12274 | S3 Redshift declarative validation for required JDBC options with focused regression coverage |
| Apache SeaTunnel #12272 | BigQuery declarative validation with nonblank identifiers, write-mode validation and regression coverage |
| Apache SeaTunnel #12175 | Typesense source/sink connection validation with regression coverage |
| Apache SeaTunnel #12174 | Nonblank validation for DataHub sink connection options |
| Apache SeaTunnel #12148 | Declarative nonblank validation for the Sentry connector |
| OpenTelemetry C++ #4520 | Wildcard matching for Metrics SDK view instrument names |
| AIBrix / vLLM #2669 | Stabilised KVCache pod-triggered reconciliation integration tests |
| AIBrix / vLLM #2652 | Added RayClusterFleet integration test coverage |
| Great Expectations #12184 | Brought metric repository tests fully under mypy with focused typing cleanup |
| Great Expectations #12149 | Validator type-checking improvements |
| EFF Rayhunter #1146 | Reject oversized Wingtech admin passwords safely with regression coverage |
| EFF Rayhunter #1134 | Exposed CLI help and default values in the installer GUI |
| ros2_lingua #20 | Completed regression coverage for all lingua::Tags constants and kept C++ bindings aligned with Python schema tags |
| ros2_lingua #21 | Normalized ROS 2 CLI namespace paths; maintainer-tested across namespace variants and merged to close #9 |
Active contributions are concentrated on AI/distributed infrastructure, data systems, observability and runtime correctness.
| Project | Current contribution |
|---|---|
| vLLM Router #297 | Add request-scoped preprocessing context for zero-copy reuse of prepared token IDs across routing decisions |
| vLLM Semantic Router #3909 | Share Go 1.25 setup across PR workflows, with workflow-contract coverage and multi-module cache correctness |
| Polars #29404 | Fix non-equivalent rolling offset/period handling with focused regression coverage |
| Prefect #23024 | Reduce Prefect task retention in shared Dask schedulers |
| OpenTelemetry C++ #4541 | Make OTLP gRPC functional teardown deterministic |
| Grafana Tempo #7866 | Restore metadata intrinsic filtering in autocomplete |
| lakeFS #10525 | Simplify Spark integration-test setup using shell and lakectl |
| xAI SDK Python #205 | Preserve explicit zero polling durations |
I am deliberately going deeper on problems where correctness, reliability and infrastructure meet: routing and CI contracts in the vLLM ecosystem, execution/runtime behaviour, telemetry and observability, data-engine correctness, and deterministic failure analysis. I prefer focused changes with regression evidence over high-volume contribution counts.
impactctl — change-impact intelligence
Know what your change can break before you merge it.
A deterministic CLI that turns Git diffs and explicit dependency manifests into explainable system-risk signals.
- API contracts, database migrations, infrastructure, CI/CD and configuration signals
CODEOWNERS-aware ownership boundaries and review hints- service maps, OpenAPI / AsyncAPI relationships and downstream dependency paths
- human-readable, JSON and GitHub-flavoured Markdown output
- public cross-platform release with checksums
bidlint — engineering procurement intelligence
Technical bid compliance, with evidence before confidence.
A deterministic engine for comparing engineering specifications with vendor bids, datasheets and submittals while preserving provenance and explicit uncertainty.
PASS / DEVIATION / MISSING / REVIEWfindings- PDF, XLSX and explicitly scoped IFC evidence
- JSON, CSV, Markdown, HTML and XLSX outputs
- offline/private-first supplier clarification intake, buyer review, evidence assessment and immutable revision history
- exact supplier-response byte provenance with fail-closed readiness and portal-scope gates
- real external supplier workflow exercised; v1.2.1 fixes a compatibility gap found by that live return without publishing confidential supplier data
- stable v1.2.1 release
| Tool | Purpose |
|---|---|
| supplier-scorecard | Explainable supplier decision infrastructure |
| rfqdiff | Structured quotation comparison |
| currency-normalizer | Multi-currency commercial normalization |
| vendor-risk-engine | Transparent supplier-risk scoring |
| payment-terms-parser | Structured supplier payment-term interpretation |
- Autonomous-system telemetry and incident forensics
- Counter-UAS validation and post-test incident reconstruction
- Evidence & assurance infrastructure for autonomous-system decision chains
- Wildfire evidence reconstruction, provenance and deterministic assurance
- Distributed systems reliability and runtime failure modes
- Observability, telemetry and production diagnostics
- AI / distributed infrastructure, routing and orchestration
- Developer tooling and change-impact analysis
- Engineering procurement and auditable technical decision systems
- Enterprise integration and architecture
Evidence before confidence · Deterministic where possible · Explicit uncertainty · Fail safely · Provenance by design
I prefer systems that make reasoning visible, preserve evidence, degrade safely under uncertainty and can be tested against real operating conditions.
Long-running work across SAP architecture, enterprise transformation, integration, data governance, industrial operations and technical procurement informs the systems I build today.
Relevant areas include S/4HANA & RISE, SAP MDG, BTP & Integration Suite, RFC/BAPI, IDoc, OData, REST/SOAP APIs, Clean Core, LeanIX, Signavio and architecture governance.
I am available for selected contract engineering, consulting and technical collaboration engagements where reliability, correctness and integration quality matter.
Typical engagements include:
- Apache SeaTunnel & data integration — connector development, validation, integration troubleshooting and focused upstream-compatible fixes
- Distributed systems reliability — failure analysis, runtime correctness, concurrency/lifecycle issues and regression engineering
- AI infrastructure — routing, orchestration, request-path reliability and production-focused infrastructure work
- Observability & telemetry — instrumentation, diagnostics, failure reconstruction and evidence-driven debugging
- Developer infrastructure — CI reliability, change-impact analysis, engineering automation and integration tooling
- Technical architecture — system boundaries, integration architecture and reliability-focused design review
Contract / consulting enquiries: info@pamilanga.com
PAMIR-CUAS technical evaluation and integration: cuas@pamilanga.com
PAMIR IGNIS independent evaluation / pilot dialogue: info@pamilanga.com