02Android Engineering | WebRTC Architecture

Sienna — Intelligent Task Planner

“Reimagining remote group productivity through NLP task scheduling, biometric authentication, and WebRTC audio huddle grids.”

RoleLead Android Engineer & Security Architect

ClientPluto Technologies

Timeline8 Weeks (Spring 2026)

01 // The Friction

Designing a Secure Task System with Frictionless Inputs

Mobile professionals spend too much time navigating input dialogs, date pickers, and priority tabs to add simple tasks. The challenge was to build an offline-first task scheduler featuring a smart, natural-language parsing engine, integrated group voice huddles for team syncs, and biometric lock protection, all within an elegant Jetpack Compose interface.

User Journey Mapping

Target Segment

David Vance — Remote Team Coordinator

Core Goal

Wants to input tasks on-the-go with natural voice or quick text, and drop into low-latency voice channels for immediate team alignment.

Core Friction

Standard task apps require endless form-filling, date navigation, and lack instant, low-latency collaboration features.

Project Chronology

Phase 1: Research

Analyzed mobile coordinator friction points. Identified that task creation time and lack of real-time voice verification are primary blockers in task manager tools.

Phase 2: Core NLP Engine

Engineered TaskNlpParser mapping quick-input keywords (e.g. "tomorrow // project details") to exact date boundaries and priority parameters.

Phase 3: WebRTC Huddles

Programmed peer voice sync channels using WebRTCHuddleManager, allowing instant voice check-ins directly inside task lists.

Phase 4: Security & Lock

Wrapped settings with biometric authentication checks (fingerprint/face unlock) via Android BiometricPrompt APIs.

02 // The Artifacts

Sienna Process Board & Visual Curation

“Sienna Stats dashboard showing user productivity heatmaps and completion metrics.”

“Sienna Projects view displaying active collaborative folders.”

Visual System & Typography

HeadingsCormorant Garamond

Body ContentPlus Jakarta Sans

Metadata / AccentJosefin Sans

Color Swatch Board

Cream Plaster#EDE5D8

Rose Blush#EA6993

Sienna Amber#A0522D

The Cutting Room Floor (Pivots & Failures)

The WebRTC Autoconnect Loop

What Failed

The early prototype automatically opened voice huddles whenever two team members looked at the same task details screen. This caused unexpected audio captures and high battery drain on mobile devices.

How We Pivoted

We scrapped autoconnect. We designed a clear, manual 'Join Huddle' tap gesture styled as a pill button with spring-loaded entry and exit animations.

03 — Process Focus

Natural Language Quick-Add

Implemented an industry-grade natural language processor that strips keywords and separator tokens (like / or //) from the title, extracting dates, assignees, priorities, and descriptions instantly without form click fatigue.

04 — Process Focus

WebRTC Group Voice Huddles

Built collaborative voice channels directly inside tasks. Leveraging peer connection huddle managers, team members can voice chat with less than 50ms latency to discuss checklist updates.

Under the Hood (Engineering Specs)

NLP Parser EngineSequential Regex Pipeline | Clean title extraction | Token stripping

Biometric IntegrationAndroidx BiometricPrompt APIs | CryptoObject signature verification

WebRTC Audio SyncDynamic peer voice channels | AudioMixer controls | Noise cancellation

WorkManager SchedulePeriodic MotivationalQuoteWorker | 3-hour sync intervals

Metrics & Outcomes

The Impact of Sienna

Rigorous testing, creative engineering performance benchmarks, and layout refinements compiled during delivery stages.

[ OUTCOME // 01 ]

150ms

NLP Quick-Add Parser Latency

[ OUTCOME // 02 ]

60fps

Stable Compose Render Framerate

[ OUTCOME // 03 ]

99%

Successful Offline Sync Rate

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