Resume

.gitignore

@@ -8,6 +8,9 @@
 !euler/**
 euler/target/
 
+!resume/
+!resume/**
+
 !xiao-esp32c6/
 !xiao-esp32c6/**
 xiao-esp32c6/.embuild/

flake.lock

@@ -40,16 +40,17 @@
         "flake-parts": "flake-parts",
         "git-hooks": "git-hooks",
         "nix": "nix",
+        "nixd": "nixd",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1762889687,
+        "lastModified": 1771545453,
-        "narHash": "sha256-oKvHfeYDZ0LfuHSaFLA0w/dfZ9R6C5W8pCGUjUWawGI=",
+        "narHash": "sha256-8Zg8fqyXdmhRhiUzNpD96eZ1Htjkfeo6573HmKp15Gs=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "3b4fb549962342c928aae1bbea3a13f0eeed2703",
+        "rev": "1419489f71dbb1736142428e2e81e3911e79945f",
         "type": "github"
       },
       "original": {
@@ -68,11 +69,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1760647834,
+        "lastModified": 1767865407,
-        "narHash": "sha256-cy80dgIs8uvush55hfV7a5ZHLOml/lDvsawayi5s/sc=",
+        "narHash": "sha256-QWF1rZYd+HvNzLIeRS+OEBX7HF0EhWCGeLbMkgtbsIo=",
         "owner": "mirrexagon",
         "repo": "nixpkgs-esp-dev",
-        "rev": "a9ee12a6c8235eb5a9d94934d3e79afac2103ffb",
+        "rev": "5287d6e1ca9e15ebd5113c41b9590c468e1e001b",
         "type": "github"
       },
       "original": {
@@ -89,11 +90,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1763016383,
+        "lastModified": 1771485140,
-        "narHash": "sha256-eYmo7FNvm3q08iROzwIi8i9dWuUbJJl3uLR3OLnSmdI=",
+        "narHash": "sha256-oFJv+Zp5AjQ9yDWlisGSD5OK20iz7v+hfedEdRg2/Aw=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "0fad5c0e5c531358e7174cd666af4608f08bc3ba",
+        "rev": "f95b0cc3fffa5057e9d207afb98dda5178253380",
         "type": "github"
       },
       "original": {
@@ -155,6 +156,21 @@
         "type": "github"
       }
     },
+    "flake-root": {
+      "locked": {
+        "lastModified": 1723604017,
+        "narHash": "sha256-rBtQ8gg+Dn4Sx/s+pvjdq3CB2wQNzx9XGFq/JVGCB6k=",
+        "owner": "srid",
+        "repo": "flake-root",
+        "rev": "b759a56851e10cb13f6b8e5698af7b59c44be26e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "srid",
+        "repo": "flake-root",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -247,27 +263,54 @@
         ]
       },
       "locked": {
-        "lastModified": 1761648602,
+        "lastModified": 1771532737,
-        "narHash": "sha256-H97KSB/luq/aGobKRuHahOvT1r7C03BgB6D5HBZsbN8=",
+        "narHash": "sha256-H26FQmOyvIGnedfAioparJQD8Oe+/byD6OpUpnI/hkE=",
         "owner": "cachix",
         "repo": "nix",
-        "rev": "3e5644da6830ef65f0a2f7ec22830c46285bfff6",
+        "rev": "7eb6c427c7a86fdc3ebf9e6cbf2a84e80e8974fd",
         "type": "github"
       },
       "original": {
         "owner": "cachix",
-        "ref": "devenv-2.30.6",
+        "ref": "devenv-2.32",
         "repo": "nix",
         "type": "github"
       }
     },
+    "nixd": {
+      "inputs": {
+        "flake-parts": [
+          "devenv",
+          "flake-parts"
+        ],
+        "flake-root": "flake-root",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1763964548,
+        "narHash": "sha256-JTRoaEWvPsVIMFJWeS4G2isPo15wqXY/otsiHPN0zww=",
+        "owner": "nix-community",
+        "repo": "nixd",
+        "rev": "d4bf15e56540422e2acc7bc26b20b0a0934e3f5e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixd",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1762844143,
+        "lastModified": 1771369470,
-        "narHash": "sha256-SlybxLZ1/e4T2lb1czEtWVzDCVSTvk9WLwGhmxFmBxI=",
+        "narHash": "sha256-0NBlEBKkN3lufyvFegY4TYv5mCNHbi5OmBDrzihbBMQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9da7f1cf7f8a6e2a7cb3001b048546c92a8258b4",
+        "rev": "0182a361324364ae3f436a63005877674cf45efb",
         "type": "github"
       },
       "original": {
@@ -285,11 +328,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1761999567,
+        "lastModified": 1771493264,
-        "narHash": "sha256-NEisnXdISmaM5LzX1RatpKR4fa6nlAxkR7QJniFq0vg=",
+        "narHash": "sha256-M5hvivITtG0wnuCRsIXf8d6MYEs5bIF8eTY2TCNRZj4=",
         "owner": "cachix",
         "repo": "nixpkgs-python",
-        "rev": "100c43175443402084f557154b06f2745995e742",
+        "rev": "7d828f3a6acb63582c6a642e3b0ce0e2ecb03749",
         "type": "github"
       },
       "original": {
@@ -312,11 +355,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1762860488,
+        "lastModified": 1771444642,
-        "narHash": "sha256-rMfWMCOo/pPefM2We0iMBLi2kLBAnYoB9thi4qS7uk4=",
+        "narHash": "sha256-ztRHVn93XOfYZNnGYyNadFdR8gp3Xi2JKDKwBzb0ApI=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "2efc80078029894eec0699f62ec8d5c1a56af763",
+        "rev": "70f44024cc9d92c56df79832d81775cb99dc2e21",
         "type": "github"
       },
       "original": {
@@ -333,11 +376,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1763001554,
+        "lastModified": 1771470520,
-        "narHash": "sha256-wsfhRTuxu6f06RMmP4JWcq3wWRlmYtQaJZ6b3f+EJ94=",
+        "narHash": "sha256-PvytHcaYN5cPUll7FB70mXv1rRsIBRmu47fFfq3haxA=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "315d97eb753cee8e1aa039a5e622b84d32a454bb",
+        "rev": "a1d4cc1f264c45d3745af0d2ca5e59d460e58777",
         "type": "github"
       },
       "original": {
@@ -360,6 +403,28 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "nixd",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1734704479,
+        "narHash": "sha256-MMi74+WckoyEWBRcg/oaGRvXC9BVVxDZNRMpL+72wBI=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "65712f5af67234dad91a5a4baee986a8b62dbf8f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",

resume/resume.typ

@@ -0,0 +1,108 @@
+// Page setup
+#set page(margin: (x: 0.7in, y: 0.55in))
+#set text(font: "New Computer Modern", size: 10.5pt)
+#set par(justify: true, leading: 0.42em, spacing: 0.42em)
+#show link: set text(fill: rgb("#333333"))
+#set list(indent: 0pt, body-indent: 0.4em, marker: [•], spacing: 5pt)
+
+// Section header
+#let section(title) = {
+  v(7pt)
+  text(size: 11pt, weight: "bold", smallcaps(title))
+  v(-2pt)
+  line(length: 100%, stroke: 0.4pt)
+  v(2pt)
+}
+
+// Unified entry: primary header + date, secondary header, then body
+#let entry(primary, date, secondary, body) = {
+  grid(
+    columns: (1fr, auto),
+    text(weight: "bold", primary),
+    align(end, text(date)),
+  )
+  v(-1pt)
+  text(style: "italic", secondary)
+  linebreak()
+  body
+}
+
+// === HEADER ===
+#align(center)[
+  #text(size: 14pt, weight: "bold")[Sicheng Pan] #h(6pt)
+  #text(size: 9.5pt)[
+    #link("mailto:sicheng0129@gmail.com")[sicheng0129\@gmail.com] #h(4pt) | #h(4pt)
+    +1 (510) 301-0622 #h(4pt) | #h(4pt)
+    #link("https://www.linkedin.com/in/sicheng-pan-0129/")[LinkedIn]
+  ]
+]
+
+// === EDUCATION ===
+#section("Education")
+
+#entry(
+  [University of California, Berkeley], [2023 -- 2024],
+  [M.S. in Electrical Engineering and Computer Sciences, GPA: 3.94/4.0],
+  [Thesis: _Extensible Rule Language for Query Optimizer_, advised by Alvin Cheung],
+)
+
+#v(5pt)
+
+#entry(
+  [University of California, Berkeley], [2019 -- 2023],
+  [B.A. in Computer Science and Statistics, GPA: 4.0/4.0],
+  [Highest Distinction in General Scholarship · Honors in Computer Science],
+)
+
+// === EXPERIENCE ===
+#section("Experience")
+
+#entry(
+  [Chroma], [Aug 2024 -- Present],
+  [Member of Technical Staff, Data Plane],
+)[
+  - Integrated 4-bit RaBitQ quantization into the SPANN index, reducing compaction time from 20 min to 2 min per 1M vectors (1536-dim) with 5× lower memory usage, enabling collections to scale from 5M to 50M with ~40ms query latency and >90% recall\@10.
+  - Designed and implemented a hybrid search API supporting composable KNN expressions (e.g., reciprocal rank fusion), sparse vector indexing (BM25, SPLADE) via Block-Max WAND, achieving sub-100ms latency at 1M scale. Shipped end-to-end across engine, API, Python/JS/Rust clients, and docs.
+  - Co-led rewrite of the distributed frontend from Python to Rust (tokio/axum), owning the read path (query plan serialization, executors). Throughput increased from 800 to 6,000+ RPS on 16 cores with latency spikes eliminated. Also shipped as the new Rust-based local client.
+  - Designed a serializable query plan and pushed query orchestration from the frontend to the query server, reducing network round trips from 3 to 1 per query and eliminating large intermediate data transfers.
+  - Implemented instant collection forking with copy-on-write semantics, enabling users to checkpoint datasets and share sample collections without incurring storage copy.
+  - Built regex query support via two-stage approach: extracting required literals from regex patterns to narrow candidates via the trigram index, then brute-force matching survivors, achieving sub-100ms latency at 1M scale.
+  - Implemented efficient limit/offset pagination, negation filters using roaring bitmaps, CMEK encryption (GCP), and group-by deduplication for chunked-document search results.
+]
+
+#v(5pt)
+
+#entry(
+  [Duolingo], [Summer 2022],
+  [Software Engineer Intern, Data Infrastructure and Experimentation Team],
+)[
+  - Implemented approximate query pipeline on BigQuery for the analytics dashboard, saving >50% query time at \<1% uncertainty.
+  - Implemented caching mechanism for common queries based on historical frequencies (AWS, Jenkins), saving >80% time for analysts.
+]
+
+#v(5pt)
+
+#entry(
+  [R-Polars Project], [Summer 2023],
+  [Contributor, Google Summer of Code],
+)[
+  - Exported Polars features to R including streaming I/O in Apache Parquet and Arrow formats.
+  - Refactored error handling with recoverable errors from Rust and implemented background query pipeline via multi-threading, saving >50% user wait time.
+]
+
+// === RESEARCH ===
+#section("Research")
+
+#entry(
+  [QED: A Powerful Query Equivalence Decider for SQL], [2021 -- 2024],
+  [UC Berkeley EECS, advised by Alvin Cheung · Published at VLDB 2024],
+)[
+  - Co-developed QED, a SQL query equivalence prover in Rust using a novel formalism (Q-expressions) under bag semantics with a complete checking algorithm for a general query fragment parameterized by first-order theories.
+  - Verified 299/444 query rewrite pairs from Apache Calcite and 979/1287 from CockroachDB, more than 2× the coverage of prior state-of-the-art.
+]
+
+// === SKILLS ===
+#v(4pt)
+#line(length: 100%, stroke: 0.4pt)
+*Languages:* Rust, Python, SQL, R, Nix \
+*Tools & Infrastructure:* Linux, Git, gRPC/Protobuf, tokio, axum, AWS, GCP, Kubernetes, Docker