Senior Full Stack Engineer

Lilt; United States; On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical benefits

Parental leave

Fringe stipend

Equity

401k match

Flexible time off

Job summary

Lilt is seeking a Senior Engineer to lead the Create team driving the Converse expansion in the United States. You will own the technical roadmap for the real-time translation service and the customer-facing surfaces, architecting low-latency streaming pipelines and live meeting experiences.

You will partner with device teams to extend the architecture across platforms, define engineering standards, and guide the product from prototype to production in multilingual live meetings.

Qualifications

• Experience with cross-platform, embedded, or mobile-adjacent architectures.
• Experience with CAT tools or translation memory systems is a plus.
• Strong backend experience with REST/gRPC/WebSockets and real-time systems.

Responsibilities

• Own architecture and technical roadmap for Converse expansion, including real-time translation service and live surfaces.
• Build low-latency, N-way translation pipeline (per-participant ingestion, diarization, streaming ASR, MT, broadcast).
• Develop live meeting experience (bot/agent, side panel, captions) and interpreter workbench.
• Design event-driven correction and broadcast system for multi-language meetings.
• Collaborate with Product/Design to translate PRD into technical designs and deliver on dates.
• Mentor engineers and establish engineering standards for a new product line.

Skills

Real-time systems

Full-stack development

React/TypeScript

Streaming pipelines

Mentoring

Secure environments

Platform SDKs

Teams app development

APIs & Web services

Technical leadership

Tools

gRPC

WebSockets

Teams Toolkit

Job description

• As the senior engineer on the Create team driving this Converse expansion, you will drive technical strategy for both the backend translation service and the customer-facing surfaces built on top of it, while working directly with Product, Design, and early design partners — architecting the low-latency streaming pipeline, building the live meeting experience and interpreter workbench, and turning ambiguous 0-to-1 requirements into a scoped plan you commit to and ship
• You will partner with the engineers already building Converse’s device/mobile experience to extend a shared translation-service architecture into new platforms and form factors, help define engineering standards as the Create team grows, and make the calls that determine whether this expansion scales cleanly from a prototype into a production product used in live, multilingual meetings
• Own architecture and technical roadmap for this Converse expansion, spanning the central real-time translation service and the customer-facing surfaces built on it (live meeting UI, interpreter workbench)
• Architect and build the low-latency, N-way translation pipeline: per-participant audio ingestion, diarization, streaming ASR, MT orchestration, and result fan-out to every language in the meeting
• Build the live meeting experience — bot/agent participant, meeting side panel, and on-stage caption surfaces — integrating with the host meeting platform’s SDK, extension framework, and APIs
• Build the interpreter workbench: a real-time, streaming adaptation of Lilt’s CAT tool with a live segment queue, low-confidence flagging, TM/TB matches, AI-Review/AI-QA signals, and submit-to-broadcast corrections
• Design the event-driven correction and broadcast system — routing flagged segments to the correct on-call interpreter by language, pausing the affected translation, and isolating each correction to a single language
• Partner with Product and Design to turn PRD requirements (JTBD, feature specs) into technical designs, and commit to and hit delivery dates on a brand-new product surface
• Collaborate with the engineers already building Converse’s device/mobile experience to extend a shared translation-service architecture (per-participant declared spoken/received languages) into new multi-device and platform form factors
• Establish testing, CI/CD, and release practices (GitHub Actions, automated e2e tests) for the new product line
• Help recruit, mentor, and set engineering standards as headcount scales on this initiative

Benefits

• Medical Benefits: Employees receive coverage of medical, dental, and vision insurance, plus FSA/DFSA, HSA, and Commuter benefits. In addition, LILT pays for basic life insurance, short-term disability, and long-term disability
• Paid parental leave is provided after 6 months
• Monthly lifestyle benefit stipend via the Fringe platform to allow employees to customize benefits to their lifestyle
• Compensation: Meaningful equity, 401(k) matching, and flexible time off plus company holidays

Qualifications

• Experience with cross-platform, embedded, or mobile-adjacent architectures, and adapting shared services across device and web form factors
• Prior experience building CAT tools, translation memory/termbase systems, or other linguist-facing review interfaces
• Experience with speech/audio pipelines: diarization, streaming speech recognition, or audio stream multiplexing
• Demonstrated ability to scope ambiguous, 0-to-1 product requirements into a technical plan and commit to and hit delivery dates
• Experience shipping in regulated or high-security customer environments
• Strong backend experience spanning REST API endpoints and real-time/streaming systems: WebSockets, gRPC, or comparable low-latency transport; event-driven architectures; message routing and state management across many concurrent sessions
• Experience integrating with third-party platform SDKs or extension frameworks (Slack, Zoom, or similar meeting/collaboration platforms) — bots, side panels, webhooks, and platform APIs
• Comfort working with or directly adjacent to ASR/MT/NLP pipelines, or other latency-sensitive ML-in-the-loop systems
• US citizenship and residence in the United States
• 5+ years of professional full-stack software engineering experience, with a track record of owning complex, real-time or streaming systems end-to-end — architecture, implementation, deployment, and production reliability
• Strong frontend experience building complex, stateful, real-time UIs in React/TypeScript — live-updating multi-pane interfaces, collaborative editors, or comparable dashboards
• Familiarity with localization/TMS workflows: XLIFF, Translation Memory, MT vs. human translation pipelines
• Experience building validation and guard logic that gracefully handles edge cases across diverse customer configurations — languages, device counts, network conditions—-
• Strong Plus—-
• Experience mentoring engineers and setting technical standards for a new product line
• Familiarity with post-meeting asset generation: transcript export formats (TXT/WebVTT/JSON), recording citations, and summarization
• Hands-on Microsoft Teams app or bot development specifically (Teams Toolkit, Bot Framework, Azure Communication Services, Microsoft Graph)