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Cresta

a16z — Backed by a16z
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Senior Software Engineer, Backend (Bucharest)

Open 51d posting dated 6 hours ago

Summary

Build and scale Cresta’s real-time voice infrastructure and AI-powered backend services in Go, integrating SIP/WebRTC and multilingual pipelines for enterprise contact centers.

Cresta unlocks the true potential of the customer experience, turning every conversation into a competitive advantage. Cresta’s unified AI platform combines conversational AI agents, real-time human agent augmentation, and comprehensive conversation intelligence to drive revenue and efficiency gains across every channel. The world’s leading companies, including United Airlines, Cox Communications, and Marriott, use Cresta to power world-class customer experiences every day.

Born from the Stanford AI Lab, Cresta has raised more than $270 million from the world’s leading investors, including a16z, Greylock, and Sequoia. Cresta’s leadership includes some of the leading minds in AI today. Our CEO, Ping Wu, founded and led Google's Contact Center AI and Vertex AI platforms before joining Cresta to build the future of AI-driven customer experiences.

Over the next few years, AI is going to redefine how people all over the world interact with businesses every day. Come build that future at Cresta.

About the role:

At Cresta, the Voice Platform team is on a mission to transform real-time voice infrastructure and contact center automation through AI-powered backend systems. As a Senior Software Engineer on the Voice Platform team, you’ll be responsible for designing, scaling, and operating the distributed services that power Cresta’s voice ecosystem.
You’ll drive major initiatives in areas such as SIP and WebRTC support, multilingual and translation pipelines, and real-time conversation intelligence. This role requires strong technical leadership, a passion for building reliable distributed systems, and the ability to collaborate across engineering and product teams to bring innovative features into production.

Responsibilities:

  • Lead the design and development of scalable, distributed backend microservices in Golang (with some Python for AI-related services).
  • Own and evolve voice platform integrations with large-scale enterprise communication and contact center systems.
  • Drive initiatives to expand platform capabilities, including bi-directional SIP, WebRTC integrations, multilingual support, advanced transcription, and real-time translation.
  • Build systems that power conversation intelligence for both remote and in-person interactions.
  • Improve observability, reliability, and self-service troubleshooting across the platform.
  • Ensure performance, scalability, and resilience of real-time voice pipelines running in the cloud.
  • Collaborate with cross-functional teams (ML, product, solution architects) to design end-to-end solutions for customer deployments.
  • Provide technical guidance, mentorship, and best practices to other engineers on the team.

Qualifications We Value:

  • Bachelor’s degree in Computer Science or related field.
  • 5+ years of experience in backend system development, distributed systems, or cloud infrastructure.
  • Expertise in Go (or a similar systems language) with strong API and service design skills.
  • Proven experience with scalable architectures using microservices, workflow orchestration, distributed caching, and cloud databases.
  • Strong knowledge of Kubernetes, Docker, and modern cloud infrastructure.
  • Solid understanding of networking, real-time communication protocols, and cloud security best practices.
  • Demonstrated ability to lead complex technical projects from design through production.
  • Bonus: experience with voice systems, telephony, or real-time media platforms

Conclusion:

Compensation for this position includes a base salary, equity, and a variety of benefits. Actual base salaries will be based on candidate-specific factors, including experience, skillset, and location, as well as applicable local pay requirements. We are actively hiring for this role in Romania, the US, and Canada.

We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates' personal and financial information through fake interviews and offers. All Cresta recruiting email communications will always come from the @cresta.ai domain. Any outreach claiming to be from Cresta via other sources should be ignored. If you are uncertain whether you have been contacted by an official Cresta employee, reach out to recruiting@cresta.ai

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What this application asks

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First Name, Last Name, Email, Phone, Resume/CV, Location

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  • Have you previously applied to or been involved in a recruitment process with our company within the past 12 months? choose one
  • Tell us about the most impactful backend or frontend system you built and deployed in production, ideally involving AI or LLMs. Describe the architecture, your end to end ownership, key technical challenges, business impact, and how you worked with customers or users throughout the process. written answer