Synthflow AI is an enterprise AI agent platform that unifies customer operations across voice, chat, and messaging. Our agents handle routine interactions at scale so teams can focus on high-value work.

• Over 20M hours of operations automated

• 60% more calls answered vs. non-AI operators

• 150M interactions handled, 99.99% uptime

Backed by Accel, Atlantic Labs, and Singular. Trusted by 1,000+ customers. Recognized as one of the most promising companies in Germany.

About Synthflow

At Synthflow we’re building the easiest way for businesses to create AI-powered phone agents. No coding, no fuss—just smarter automation. We’re passionate about delivering the future of voice technology with lightning-fast, scalable solutions. It’s an exciting time at Synthflow: we’re early, fast-growing, and laser-focused on impact. Join us to do the best work of your career while helping businesses thrive.

About the role

We’re looking for a Senior Go Software Engineer to build real-time voice AI systems that set the standard.

Your responsibilities will include:

• Design and enhance backend infrastructure focusing on scalability, performance, and reliability. Implement features and maintain the systems that power our next-generation products.

• Expertly manage concurrency and parallelism in Go using goroutines, channels, and synchronization primitives like mutexes and wait groups.

• Develop robust networking and streaming capabilities, including experience with network programming, sockets, and protocols like WebSockets and WebRTC.

• Lead performance optimization initiatives by profiling Go code, reducing latency, and efficiently managing memory and garbage collection.

• Build fault-tolerant systems with strong recovery mechanisms and failover strategies to maintain service continuity.

• Implement comprehensive logging and tracing using tools such as zap, klog, OpenTelemetry, and Jaeger to enhance monitoring and troubleshooting.

• Apply Test-Driven Development (TDD) and engage in Pair Programming to ensure high code quality and promote team collaboration.

• Participate actively in code reviews, offering constructive feedback to uphold code quality and adhere to best practices.

• Stay informed on the latest in software development and contribute to the team's continuous learning and improvement.

You have:

• At least 5 years of professional experience with Go, along with a track record of developing scalable and extensible systems.

• Additional proficiency in Python and familiarity with infrastructure containerization, DevOps (preferably GCP or AWS).

• Extensive experience in creating and maintaining robust APIs and implementing advanced CI/CD pipelines.

• A strong foundation in software engineering principles and a commitment to leading-edge practices including TDD, pair programming, and continuous integration.

Beyond the basics:

• Exposure to real-time infrastructure or latency critical systems

• Nice to have: A background in AI, particularly around Large Language Models, Speech to Text, and Voice Synthesis applications.

• Knowledge of distributed computing and cloud infrastructure at scale.

What We Offer:

• Autonomy at speed: High-ownership roles in a fast-moving startup.

• Remote-first flexibility: Contribute from anywhere, on your schedule.

• Cutting-edge technology: Work on what interests you most.

• Career growth: Scale your impact as the company grows.

• Rewarding package: Competitive pay, equity options, and comprehensive benefits that reflect your skills and experience. 

Founded in Berlin in 2023 by serial entrepreneurs Albert Astabatsyan, Hakob Astabatsyan, and Sassun Mirzakhan-Saky, Synthflow AI democratizes access to advanced voice AI with a no-code platform that lets enterprises easily create, deploy and scale natural-sounding, cost-effective voice agents tailored to their business needs.