Senior Software Engineer - Platform

About UnifyUnify is revolutionizing the way revenue teams operate by developing the first AI-powered system of action. Our mission is to transform outbound strategies into a robust growth engine, ensuring that go-to-market execution is observable, repeatable, and scalable. Established in 2023 by industry leaders from Ramp and Scale AI, our talented team boasts backgrounds from renowned companies like Airbnb, Meta, Waymo, and Perplexity.In 2024, Unify achieved an impressive 8x revenue growth and serves a diverse clientele including Perplexity, Cursor, SoFi, and Justworks. We are a dynamic team fueled by high energy and intensity, having secured $58M in funding from leading investors such as Thrive, Emergence, and OpenAI. Join us in shaping the future of GTM!About the Role:As a Senior Software Engineer specializing in AI at Unify, you will be at the forefront of innovation, developing new AI products and enhancing our AI platform. Your work will encompass agents, retrieval systems, classification, fine-tuning, reinforcement learning, and LLM inference infrastructure. If you are passionate about creating production-ready AI systems and wish to contribute to cutting-edge applications used by premier GTM teams, this role is for you.

Join our dynamic team at unify as a Senior Backend Software Engineer, where you will leverage your expertise to design and implement robust backend systems that enhance our product's performance and scalability. You will collaborate closely with cross-functional teams to develop innovative solutions that meet our customers' needs.

About UnifyAt Unify, we are pioneering an innovative AI-driven system of action for revenue teams. Our mission is to revolutionize outbound strategies into a high-performing growth engine, making go-to-market execution transparent, repeatable, and scalable. Founded in 2023 by industry leaders from Ramp and Scale AI, our talented team boasts experience from notable companies like Airbnb, Meta, Waymo, Perplexity, and Monday.com.In 2024, Unify achieved an impressive revenue growth of 8x, serving esteemed clients such as Perplexity, Cursor, SoFi, and Justworks. We are a dynamic and high-energy team backed by $58M in funding from Thrive, Emergence, OpenAI, and more. Join us in shaping the future of GTM!About the RoleAs the first Backend Staff Software Engineer at Unify, you will play a crucial role in scaling our core platform to accommodate our rapid growth. Collaborating directly with the founders, you will bring innovative product ideas to life, establish a clear technical vision, and set engineering standards that will guide our evolving company.

About UnifyAt Unify, we're pioneering the first AI-driven system of action for revenue teams. Our innovative platform empowers companies to revolutionize their outbound strategies, transforming them into high-performing growth engines by enhancing go-to-market execution to be observable, repeatable, and scalable. Founded in 2023 by industry veterans from Ramp and Scale AI, our team boasts experience from leading firms such as Airbnb, Meta, Waymo, and Perplexity.In 2024, Unify achieved an impressive 8x revenue growth and proudly serves esteemed clients including Perplexity, Cursor, SoFi, and Justworks. With a dynamic and energetic team, we’ve successfully raised $58M from top investors like Thrive, Emergence, and OpenAI. Join us in building the future of GTM!About the RoleAs an early Engineering Manager at Unify GTM, you will have the unique chance to shape the foundation of a fast-paced, high-impact engineering organization at the forefront of AI technology.You will lead one of our core product teams, taking charge of delivery, quality, and team dynamics, while closely collaborating with product and design to turn visionary ideas into reality. You'll also play a pivotal role in establishing the scaffolding for our scaling efforts: defining our culture, systems, and standards of technical and operational excellence.This is a significant, trusted role during a period of rapid expansion, ideal for someone eager to build, lead, and evolve with an ambitious team.

About UnifyAt Unify, we're pioneering the first AI-driven system of action for revenue teams. Our innovative approach empowers companies to transform their outbound strategies into a leading growth engine, ensuring that go-to-market execution is observable, repeatable, and scalable. Established in 2023 by visionaries from Ramp and Scale AI, our diverse team boasts experience from industry giants such as Airbnb, Meta, Waymo, and Perplexity.Having achieved an impressive 8x revenue growth in 2024, we proudly serve esteemed clients including Perplexity, Cursor, SoFi, and Justworks. With a dynamic team that has successfully raised $58M from prominent investors like Thrive, Emergence, and OpenAI, we are at the forefront of revolutionizing the future of GTM. Come and be a part of this exciting journey!About the RoleAs a Senior Site Reliability Engineer (SRE) at Unify, you will play a pivotal role in addressing the challenges of scaling and maintaining reliability as we handle immense data volumes and support enterprise clients with stringent uptime standards. Your expertise will span the entire tech stack—optimizing databases, fortifying services, and crafting automation and observability tools to ensure Unify remains fast and dependable at scale.

Join our innovative team at Unify as a Senior Software Engineer, Platform, where you will play a crucial role in enhancing our platform capabilities. You will collaborate with cross-functional teams to design, develop, and implement high-quality software solutions that meet our clients' needs.

Responsibilities:Develop Our Product. Take ownership of software features that enhance our AI platform, empowering private market investors to analyze deals swiftly and accurately. This role requires you to actively engage in coding and delivering essential platform components from the ground up.Ensure Quality and Excellence. Establish and maintain coding standards, architectural guidelines, and review procedures; mentor fellow engineers. Co-cultivate a culture centered on practical, reliable, and test-driven development that swiftly meets business requirements.Scale for Growth. Assist in monitoring and scaling the architecture of our platform and its infrastructure.Collaborate Across Functions. Engage closely with product, security, and go-to-market teams to translate our strategic roadmap into actionable features and deliverables.

Join Unify as a Senior Product ManagerAt Unify, we're pioneering the first AI-driven action system for revenue teams, dedicated to transforming outbound strategies into robust growth engines. Our focus is on making go-to-market (GTM) execution not only observable but also repeatable and scalable. Founded in 2023 by industry leaders from Ramp and Scale AI, our team boasts experience from top-tier companies including Airbnb, Meta, Waymo, and others.In 2024, Unify achieved an impressive 8x revenue growth and is proud to serve clients like Perplexity, Cursor, SoFi, and Justworks. Our dynamic team has successfully raised $58 million from prominent investors such as Thrive, Emergence, and OpenAI. Be part of the future of GTM—join us!Role OverviewAs a member of our elite product team, you will collaborate closely with Unify's founders and executive team, taking ownership of product direction and execution.Our mission is to revolutionize go-to-market strategies through AI. We value strong product instincts across our engineering and design teams, and we seek an individual who can accelerate our product development, address gaps in thinking, and significantly enhance our offerings for customers.If you have experience building products from the ground up, running your own venture, or serving as an early Product Manager at a rapidly growing startup, this role is tailored for you.Your ResponsibilitiesOwn the product vision. Collaborate with our founders to define our offerings based on deep customer insights and business context.Lead strategy and execution. Manage engineering pods, overseeing the roadmap, setting priorities, and ensuring delivery of high-impact initiatives.Oversee end-to-end product shipping. Transform concepts from sketches to launched features through scoping, measuring, and iterating.Be the advocate for our customers. Engage with users regularly, analyze usage data, and convert insights into impactful product decisions.Focus on user experience. Pay attention to every detail—from clicks to labels—ensuring a seamless and delightful user journey.Elevate product quality standards. Help establish benchmarks for product excellence at Unify, influencing how we approach quality, decision-making, and delivery.

Join the Revolution at Retell AIRetell AI is pioneering the future of call centers through innovative voice AI, driven by first principles thinking.In just 18 months since our inception, we have empowered thousands of businesses with our AI voice agents, transforming how sales, support, and logistics calls are managed—previously requiring extensive human teams. Supported by prestigious investors such as Y Combinator and Alt Capital, we've rapidly scaled from $5M ARR to an impressive $36M ARR with a compact yet dynamic team of 20.Our ambition for 2026 is to create a revolutionary customer experience platform, where entire contact centers are powered by AI. Moving beyond basic automation, we aim to develop intelligent AI “workers” that serve as frontline agents, QA analysts, and managers, continuously enhancing customer interactions without the need for constant human oversight.As we expand, we are seeking passionate engineers who are eager to solve challenging technical problems, act swiftly, and make a significant impact in one of the fastest-growing voice AI startups. Let’s shape the future together.

fractional-ai is looking for a Senior or Staff Software Engineer to join the San Francisco office. This position centers on building advanced AI solutions with a team that values both technical depth and collaboration. Role overview This role focuses on designing and developing AI-driven systems. The work involves solving technical challenges and contributing to projects that push the boundaries of what AI can achieve. Collaboration with other engineers and stakeholders is a key part of daily responsibilities. Who will thrive Experienced engineers with a strong background in software development Those who enjoy working on complex technical problems Individuals who value teamwork and open communication Location This position is based in the San Francisco office.

Join Our Innovative Team at Retell AIRetell AI is at the forefront of revolutionizing the call center industry through advanced voice AI technology. In just 18 months since our inception, we have empowered thousands of businesses to optimize their sales, support, and logistics calls, which previously relied on large teams of human agents. Supported by prominent investors including Y Combinator and Alt Capital, we've achieved remarkable growth, scaling from $5 million to $36 million in annual recurring revenue (ARR) while expanding our talented team to 20 members.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform, transforming entire contact centers with AI. Unlike traditional automation that requires ongoing human oversight, we are building intelligent AI "workers" capable of functioning as frontline agents, quality assurance analysts, and managers, constantly enhancing customer interactions.If you are a passionate innovator eager to solve complex technical challenges and make a tangible impact at one of the fastest-growing voice AI startups, we invite you to join us in shaping the future.Ranked among the top 50 AI applications by a16z: a16z List4th on Brex's Fast-Growing Software Vendors of 2025: Brex BenchmarkFeatured as a leading startup on: Leanaileaderboard

fractional-ai is hiring a Software Engineer to join the team onsite in San Francisco. This role centers on building and improving technology that advances artificial intelligence. Role overview As a Software Engineer, you will work closely with others to develop and support projects that drive the company’s AI initiatives forward. The work involves collaborating with colleagues and contributing technical solutions in a team setting. What you will do Develop software for AI-driven projects Collaborate with team members in the San Francisco office Contribute ideas and technical expertise to ongoing initiatives Requirements Interest in technology and artificial intelligence Ability to work onsite in San Francisco Strong motivation to learn and contribute to team projects

Join Us in Combating the Escalating Wildfire Crisis with Cutting-Edge AI and IoT SolutionsAbout UsThe Challenge: In the face of climate change, wildfires are becoming more frequent and severe. Traditional methods of fire detection, reliant on bystanders and emergency calls, lead to critical delays in response times. Fire authorities require innovative solutions for faster detection, verification, and response to avert catastrophic fire outbreaks.Who We Are: Pano AI is a dynamic growth-stage startup based in San Francisco, comprising over 150 passionate professionals. We stand at the forefront of wildfire detection and intelligence, equipping fire services with timely information and advanced technology to enhance their response capabilities. Our platform integrates cutting-edge hardware, software, and AI, utilizing ultra-high-definition 360-degree cameras positioned strategically to provide real-time threat assessments. Our technology empowers fire professionals with actionable insights, enabling them to prevent minor flare-ups from escalating into significant disasters.Recognized by TIME as one of the 100 Most Influential Companies of 2025, and featured in MIT Technology Review's top 15 climate tech companies to watch, Pano AI is paving the way for innovative solutions in fire response. Our contributions have been recognized in major publications such as the Wall Street Journal and Bloomberg.

Join Us at Retell AIRetell AI is revolutionizing the call center industry by leveraging innovative voice AI technology based on first principles.In just 18 months since our inception, we have attracted thousands of companies that rely on Retell's AI voice agents to efficiently manage sales, support, and logistics calls, previously handled by large teams of human agents. Supported by renowned investors such as Y Combinator and Alt Capital, we have rapidly grown from $5M to $36M in Annual Recurring Revenue (ARR) with a dedicated team of 20.Looking ahead to 2026, our ambition is to establish a state-of-the-art customer experience platform entirely powered by AI. We aim to create intelligent AI “workers” capable of serving as frontline agents, quality assurance analysts, and managers, continuously optimizing customer interactions without the need for constant human oversight.We are on an exciting growth trajectory and are seeking driven individuals who are eager to solve complex technical challenges, accelerate progress, and make a significant impact at one of the fastest-growing voice AI startups.Let’s innovate the future together!Ranked as a top 50 AI app by a16z: https://tinyurl.com/5853dt2x#4 on Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025One of the top startups on: https://leanaileaderboard.com/

Join Retell AI as a Senior Full Stack Software EngineerAt Retell AI, we are revolutionizing the call center industry with innovative voice AI technology. Our cutting-edge solutions are designed to improve communication efficiency, allowing businesses to automate sales, support, and logistics calls that once required large teams of human agents. In just 18 months, we have experienced remarkable growth, achieving $36M in annual recurring revenue with a dedicated team of 20, up from $5M at the beginning of 2025.Our goal for 2026 is to create a modern customer experience platform powered entirely by AI. We are not just automating but building intelligent AI agents that can perform the roles of frontline agents, quality assurance analysts, and managers, continuously enhancing customer interactions.We are rapidly expanding and seeking talented individuals who are ready to solve challenging technical problems, work at a fast pace, and make a significant impact in one of the fastest-growing voice AI startups.Let’s shape the future of communication together!

About Simple AIAt Simple AI, we are pioneering cutting-edge voice AI solutions tailored for enterprises. Our lifelike voice agents empower renowned companies such as DoorDash, xAI, and Omaha Steaks in managing diverse phone operations ranging from customer support to order intake and lead qualification. As we experience rapid revenue growth, we seek a couple of founding software engineers to help us meet current customer demands while developing innovative systems for the future. Our team is passionate about harnessing AI to transform the world, and we operate from our San Francisco office five days a week.Simple AI is proudly supported by top-tier investors and industry leaders, including Y Combinator, Massive Tech Ventures, and prominent figures like Michael Seibel (co-founder of Twitch), Jared Friedman (Scribd), Alexandr Wang (Scale AI), Matt Van Horn (June Oven and Lyft), Suhail Doshi (Mixpanel), JJ Fliegelman (WayUp), and Scott Wu (Cognition).Meet the FoundersThe founders, Catheryn Li and Zach Kamran, previously led software teams at Y Combinator, where they launched numerous products for YC founders, including the co-founder matching site. Cat brings experience from Instagram and Facebook and holds degrees in mathematics and computer science from MIT. Zach studied computer science and statistics at the University of Chicago and led software initiatives at PEAK6.What We ProvideCompetitive salary with significant equity opportunitiesEmployee-friendly equity termsOffice located in San FranciscoComprehensive health, dental, and vision insuranceComplimentary lunch and dinner at the officeFree Uber rides home after 8:30 PMRegular team events and offsite activitiesYour Qualifications4+ years of relevant software engineering experience.Exceptional problem-solving skills and a passion for tackling technical challenges.A customer-centric mindset coupled with strong communication skills and a keen interest in product design and prioritization.Self-motivated with the ability to work independently.A genuine enthusiasm for continual learning and keeping abreast of the latest advancements in AI.

At Lassie, we are revolutionizing healthcare by building AI solutions that empower health practices. Our innovative approach addresses the chronic staffing shortages that have plagued medical offices, particularly since the pandemic, leading to frustrating patient experiences.We envision a future where AI serves as the backbone of medical practices—efficiently managing administrative tasks and enhancing patient interactions through intelligent agents.Founded by seasoned entrepreneurs Steijn Pelle and Frédéric Renken, who have successfully driven growth at major tech companies, we are infusing consumer product design into healthcare, reshaping how doctors and patients connect.

Join Aircall, a rapidly growing unicorn company and pioneering AI-driven customer communication platform utilized by over 22,000 businesses globally to enhance revenue, expedite issue resolution, and empower customer-facing teams. We are transforming the landscape of customer communications by seamlessly integrating voice, SMS, WhatsApp, and AI into one cohesive workspace.Our success stems from a straightforward principle: empower teams to work smarter, not harder. With features like the AI Voice Agent automating routine calls, AI Assist optimizing post-call tasks, and AI Assist Pro providing real-time support, we enable teams to achieve exceptional performance. The outcome? Increased revenue, quicker resolutions, and scalable teams operating with confidence.Headquartered in Paris, our European HQ, we also have a robust North American presence anchored in Seattle, with teams spread across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. With a product that delights customers and a business model that is scaling rapidly, we are supported by top-tier investors and are at the forefront of AI innovation across diverse product lines.At Aircall, you will be part of a dynamic company. Our ambition drives us, we are product-focused, and we prioritize execution with tangible impacts, swift decision-making, and genuine growth.Our Work Culture at Aircall: We are obsessed with our customers, driven by data, and dedicated to achieving meaningful results. We cherish ownership, continuous learning, and a thoughtful approach to speed. If you thrive in a collaborative and fast-paced environment where trust and impact are valued, you will find your place with us.As a Senior Backend & AI Engineer, you will play a crucial role in designing, developing, deploying, and maintaining essential AI features for our business. Your prior experience in implementing AI functionalities is crucial. You will be expected to promote best practices, mentor fellow team members, and contribute to enhancing quality, excellence, and agility in our delivery processes. Your innovative contributions will include building practical applications such as chatbots, virtual assistants, automated content generation, and other NLP-driven tools. You will leverage and optimize existing large language models (LLMs) to meet specific business needs and domains, ensuring they perform exceptionally in real-world scenarios.

About Flow EngineeringFlow Engineering is an innovative platform harnessing the power of AI to transform how modern engineering teams manage requirements. Our AI-native solution empowers hardware teams to collaborate seamlessly with intelligent agents, facilitating the design, validation, and evolution of complex systems at unprecedented speed and precision.About the RoleWe are on the lookout for experienced senior software engineers with a passion for AI to develop advanced capabilities that enhance the way teams create, review, and oversee requirements. In this role, you will engage with agentic systems and domain engineer workflows, positioning AI at the core of team decision-making processes regarding their systems.This position uniquely integrates AI, product development, and full-stack engineering, allowing you to transform ideas from initial prototypes into stable, observable features deployed in production environments.What You’ll DoDesign and implement AI-driven features, such as assisted requirement drafting, consistency checks, impact analysis, and intelligent suggestions tailored for systems and domain engineers.Create agentic workflows that empower systems engineers and domain engineers to explore designs, simulate changes, and validate requirements effectively.Assess and integrate language models and associated tools, focusing on optimizing reliability, latency, cost, and debuggability within production settings.Develop and sustain the necessary infrastructure, including data pipelines, evaluation harnesses, prompt and model management, observability, and safety protocols.Engage across the entire technology stack—from backend integrations and APIs to user interface components—to deliver comprehensive AI features beyond mere model endpoints.Collaborate with product teams and customers to identify high-value workflows, conduct experiments, and iterate rapidly based on real-world usage insights.About YouA minimum of 3 years’ experience in applied machine learning, large language models, or related fields, with a proven history of delivering ML/LLM-powered features to production.At least 5 years of experience in software development, involving the design, testing, and operation of scalable services in a cloud-based environment.Practical experience with contemporary LLM providers and tools (e.g., OpenAI, Anthropic, Hugging Face, vector stores, and retrieval-augmented generation patterns).Familiarity with prompt design, retrieval-augmented systems, evaluation methodologies, and safety/guardrail strategies.Strong analytical skills to evaluate trade-offs between various models, architectures, and deployment patterns, enabling informed decision-making.A collaborative spirit and effective communication skills to work alongside cross-functional teams.