Abhinav (August) Srivastava
Founding Senior Engineer at Ambrawhich I also helped cofound
Ambra is an autonomous RCM platform for EMS agencies - denials management, clean claims, and a voice-first scribe.
Previously Founding Engineer at Simbie AI and SWE 2 at Commure.
Experience
Ambra — Founding Senior Engineer
December 2025–present
- Built Ambra's production platform from its initial prototype. Now lead engineering across denials management, claim status, claims posting, analytics, and AI-assisted EMS documentation.
- Built the denial workflow end to end: SFTP and file ingestion, data normalization, payer and funding classification, document retrieval, PDF redaction, appeal-packet generation, and mail, fax, and portal submission.
- Built a TypeScript and React application for dense billing workflows involving thousands of payer and denial configurations, live background jobs, large claim queues, and high-resolution medical attachments.
- Built the core backend in Go and PostgreSQL, with Python and Django services for agent workflows, deployed on GCP and Cloud Run.
- Integrated X12 transactions, EMS record systems, clearinghouses, payer portals, SFTP sources, telephony systems, and browser automation with Playwright and direct network integrations.
- Built ephemeral pull-request environments, tenant-aware visual testing, PHI-leak checks, automated migration coordination, and application/database revision gating.
- Led the company through HIPAA and SOC 2 readiness while owning architecture, infrastructure, customer launches, production support, and a large share of implementation.
- Managed and hired engineers, designed technical interviews, ran one-on-ones and code reviews, and worked directly with customers from discovery through production.
Simbie AI — Founding Engineer
May 2025–December 2025
- Reworked a bespoke, single-customer healthcare voice-agent system into a multitenant platform with organization isolation, configurable agents, phone routing, EHR credentials, and complete white-labeling.
- Took three medical practices from discovery through agent design, EHR integration, QA, production launch, and ongoing operation.
- Built voice-agent workflows for scheduling, patient lookup, insurance verification, and outbound patient communication.
- Built low-latency EHR integrations with caching and advance schedule preloading, so agents could access patient and appointment data during live calls.
- Developed an internal call-evaluation system that reviewed conversations, generated structured criticism, retained recurring failure patterns, and informed improvements to agent behavior.
- Helped hire and operationalize a remote QA team that reviewed production calls and supplied human feedback.
- Worked across Python, TypeScript, PostgreSQL, Redis, RabbitMQ, AWS, Grafana, database design, queues, deployment, and production reliability.
- Operated as the principal available engineer during critical periods while remaining directly responsible for customer implementation and support.
Commure — Software Engineer II
June 2024–May 2025
- Built clinical-documentation integrations across about 20 EHRs and 30 practice configurations for the Athelas Scribe product.
- Expanded the integration platform from generic EHR behavior to configurable, practice-specific workflows.
- Reduced the execution time of an important RPA-based integration workflow from about 10 minutes to 20 seconds.
- Built a greenfield React client for a hardware-integrated clinical workflow, developed with a major U.S. health system.
- Helped migrate the scribing client from Flutter to React Native and package the full application as an embeddable SDK for partner healthcare applications.
- Built integration infrastructure that let providers launch the complete scribing workflow from within an existing mobile application.
- Worked on DOM-based Chrome-extension automation across legacy EHR interfaces.
- Designed and prototyped a domain-specific language for remotely configurable EHR interactions, which reduced dependence on hard-coded extension releases and protected proprietary integration logic.
RISC-V Mentorship — Mentee
March 2024–May 2024
- Worked with OCaml, Sail, TypeScript, and React to turn RISC-V specifications into structured, usable developer resources.
- Built JSON-driven specification conversion and code-generation tooling.
- Developed an interactive React reference for exploring the RISC-V instruction-set architecture.
Projects
Hamlet — An agent-tech community, a replacement for Discord/Discourse.
Copy Doc Comments — A copy-comments button for Google Docs to grab all the comments for LLMs.
ThoughtForest — Acontent curation system for YouTube, Substack and Twitter (more to come).
Ultraball — An SSH-based multiplayer Pokémon battle system.
FHIR.py — A FHIR SDK for real vendor implementations, not just the nominal spec - eClinicalWorks and Healow scheduling implemented (more to come). Unofficial, unaffiliated.
KarlTrain — A better Caltrain tracking app that knows where you are, built for humans.
Walk Reminder — Asmall, lightweight menu-bar app that gets you to stand up more.
Libreprose — A distraction-free writing environment for long-form work.
Vinyl — Generate a looping, spinning-vinyl video from any audio file, in your browser.
HAR to cURL — Cleans up your HAR files to make them friendlier for LLMs.
Archived
ASM Garden — A LeetCode-style playground for x86-64 assembly: small problems, in-browser assembler, instant feedback. A gentler on-ramp to low-level programming.
Strudel — Spin up and tear down ephemeral Ethereum testnets for teams, so a whole engineering org can share forks and state without stepping on each other.
Elcair — Point at an Ethereum contract ABI, get a typed TypeScript SDK - no hand-rolled wrappers, no drift between contract and client.
Profs — Search university faculty by research interest and recent publications - find the right advisor, reviewer, or collaborator without trawling department pages.
Research
EmberDB - FHIR-native time-series storage for critical care. A specialized database treating FHIR Observations as first-class citizens, benchmarked against InfluxDB, TimescaleDB, and QuestDB on MIMIC-III data.
Healthcare Voice Agent Security - Evaluating AI voice platforms deployed in healthcare settings, covering prompt injection, PHI extraction, and synthetic voice attacks with a novel FHIR-compliant testing framework.
Privacy-Preserving Healthcare Cost Prediction - Custom secure multiparty computation protocol enabling joint model training across hospitals, insurers, and public health agencies without exposing raw data.
zkDNA - Zero-knowledge proofs for negative STR DNA match verification, allowing proof of non-match in forensic contexts without revealing actual genetic data.
Formal Verification of FHIR Resources - Applying lightweight formal methods (Alloy) to verify structural integrity and safety invariants of HL7 FHIR data models.
Reading MUMPS at Scale - An open tree-sitter grammar for MUMPS, the language behind the VA's VistA EHR. Parses 98.6% of VistA's 33,951 routines into an analyzable syntax tree, validated against YottaDB, with call-graph and runtime-code-generation measurements.
Published: Nature-Inspired Swarm Optimization in ANNs (IEEE)
Full research details →
Interested in collaborating? Email me at sabhinav at bu dot edu.
Open source
Go - cmd/compile: lower float min/max branch idiom to MINSD/MAXSD/FCSEL.
Cython - fix a compiler crash on starred names in assignment targets during constant folding.
Ruff - restrict FURB131 (delete-full-slice) to lists; the dict rewrite was a runtime KeyError.
Zephyr - implement POSIX putmsg().
DuckDB - skip top-n window elimination when the limit exceeds the min/max n cap, so a valid QUALIFY query no longer errors.
Apache NuttX - balance connection and buffer references in the Bluetooth HCI ACL receive path (leak, double free).
Community involvement
Outside work
- Sports, mostly Bay Area - Sharks, Earthquakes, Warriors, Valkyries, Giants, Bay FC, San Francisco Unicorns, USMNT, and the Celtics.
- Music - I make house, DJ, and play bass.
- Science fiction. I built Libreprose before the AI era to help me handle long drafts; it is due for a rewrite.
- Reading, and trying to read more - Goodreads, which is missing plenty of it.
Education
- Boston University - MS Computer Science, CyberSecurity (2024)
- Vellore Institute of Technology - BS Computer Science (2021)
Soquel — Abetter Finder.