Fullstack Developer (PHP with YII framework)

About the Role

We are hiring Staff / Principal Engineers to take full, hands-on ownership of Blitzy's most critical production-grade systems and to deliver high-leverage features that materially improve customer outcomes and engineering velocity. This is the most senior individual contributor role at the company today.

This is not a Senior-plus role, an architecture-only role, or a promotion-track role. We are looking for someone who has already operated at Principal / Staff+ scope in a highly technical environment and expects to spend their time writing, reviewing, and shipping production code.

This role is 100% hands-on. Leverage comes from system ownership, execution quality, and durable technical decisions — not people management or process.

Responsibilities

• Own mission-critical production systems end-to-end, ensuring correctness, scalability, performance, reliability, and operational excellence.
• Design, build, and ship high-impact backend systems and features that improve product reliability, performance, and customer value.
• Architect scalable services and cloud infrastructure using technologies such as Python, REST, gRPC, Kubernetes, and Terraform.
• Identify and resolve complex technical bottlenecks that limit engineering quality, system performance, or organizational velocity.
• Build and operate LLM-powered systems and validation loops that evaluate correctness, consistency, durability, and production performance.
• Design and evolve data architectures incorporating relational, NoSQL, graph, and vector databases to support complex enterprise applications and semantic retrieval.
• Modernize and improve complex enterprise systems while balancing reliability, maintainability, scalability, and delivery speed.
• Set and uphold engineering quality standards through hands-on technical leadership, sound technical judgment, and ownership of long-term technical decisions.

Qualifications

• Direct experience with Python as a primary programming language, backend frameworks, and microservices architectures.
• Expertise in REST and gRPC, with proficiency in Node.js and JavaScript.
• Proficiency in GCP, along with experience using at least one additional cloud platform such as AWS or Azure.
• Advanced knowledge of Kubernetes and Terraform in production environments.
• Experience operating highly available production systems, including monitoring, scalability, reliability, performance optimization, and operational tooling.
• Strong knowledge of SQL and NoSQL databases, including PostgreSQL, MySQL, MongoDB, Cassandra, or DynamoDB.
• Familiarity with graph databases such as Neo4j and vector databases or embedding infrastructure for semantic search and retrieval.
• Hands-on experience building and operating LLM-powered systems in production, including evaluation, validation, regression testing, tracing, and failure analysis.
• Working knowledge of LangSmith or comparable LLM observability and evaluation tools; familiarity with OpenAI, Anthropic, or similar model providers is a plus.
• Ability to contribute across the full stack, with a strong understanding of frontend architecture and the ability to debug, design, and ship across frontend, backend, infrastructure, and AI systems.
• Understanding of large-scale enterprise software systems, including architecture, integration, deployment, modernization, and long-term maintainability.
• Proven track record of operating at Staff+, Principal Engineer, or equivalent level, independently driving complex technical initiatives and delivering high-impact outcomes with minimal supervision.

Blitzy is a Cambridge, MA based AI software development platform on a mission to revolutionize the software development life cycle by autonomously building custom software to unlock the next industrial revolution. We're transforming how enterprises build software, turning enterprise requirements into enterprise grade code with an agentic software development platform that can autonomously execute 80% of the quantum of software development work. We're backed by multiple tier 1 investors, and have proven success as founders of previous start-ups.

Our Culture

Who we are:

Led by two pioneering co-founders we are one of the fastest growing companies in the U.S., creating our own category of enterprise autonomous software development. We automate thousands of hours of software development for our customers, which includes strong representation within the Fortune 500.

How we work:

• We move Blitzy Fast: Time is both our company’s and our clients’ most precious asset. We move quickly and decisively to innovate internally and deliver exceptional software externally.
• Championship Mindset: We operate like a professional sports team. We win as a team by holding ourselves and each other to high standards, collaborating in-person, and remaining focused on the mission.
• Passion for Invention: We’re pushing the frontier of what’s possible, requiring constant innovation and iteration.
• We Work for the Customer: We focus on delivering outsized value to the customers we work with and expanding those relationships into deep, meaningful partnerships.
• We believe in being ‘everyday athletes’: taking care of ourselves so we can bring our best minds to work. We promote great sleep, movement, and restorative activities for 

Blitzy is an equal opportunity employer committed to building a diverse and inclusive team. We believe different perspectives make us stronger.

Senior Software Engineer

AiSensy  

Gurugram, Haryana, India (On-site)

About AiSensy

AiSensy is a WhatsApp based Marketing & Engagement platform helping businesses like Adani, Delhi Transport Corporation, Yakult, Godrej, Aditya Birla Hindalco, Wipro, Asian Paints, India Today Group, Skullcandy, Vivo, Physicswallah, and Cosco grow their revenues via WhatsApp.

• Enabling 100,000+ Businesses with WhatsApp Engagement & Marketing
• 400 Crores+ WhatsApp Messages exchanged between Businesses and Users via AiSensy per year
• Working with top brands like Delhi Transport Corporation, Vivo, Physicswallah & more
• High Impact as Businesses drive 25-80% Revenues using AiSensy Platform
• Mission-Driven and Growth Stage Startup backed by Marsshot.vc, Bluelotus.vc & 50+ Angel Investors

Key Responsibilities:

• Build Scalable Architecture to handle millions of messages per day.
• Lead a team of engineers and guide them on a day to day basis.
• Collaborate with product managers, designers, and other engineers to define and implement new features and enhancements.
• Write clean, maintainable, and efficient code following best practices and coding standards.
• Conduct code reviews to ensure code quality and adherence to standards.
• Identify and resolve performance bottlenecks, bugs, and other issues.
• Mentor and provide guidance to junior engineers, fostering a culture of continuous learning and improvement.
• Participate in architectural discussions and contribute to the technical direction of the team.
• Stay up-to-date with the latest industry trends and technologies, and incorporate them into our development processes.
• Ensure the security, reliability, and performance of our applications.
• Collaborate with DevOps to streamline the deployment and monitoring processes.

Qualifications:

• Bachelor’s degree in Computer Science, Engineering, or a related field. Master’s degree preferred.
• Over all 5+ years of experience with proven experience 3+ years as a Software Engineer, with a strong track record of delivering high-quality software products.
• Expertise in the MERN stack (MongoDB, Express.js, React, Node.js).
• Strong understanding of JavaScript and modern JavaScript frameworks.
• Experience with front-end technologies like HTML5, CSS3, and responsive design.
• Strong understanding of software development methodologies, including Agile and Scrum.
• Experience with RESTful API design and development.
• Experience with database design and management, particularly MongoDB.
• Familiarity with cloud platforms such as AWS.
• Excellent problem-solving and analytical skills.
• Strong communication and collaboration abilities.
• Experience with version control systems such as Git.
• Knowledge of containerization and orchestration tools like Docker and Kubernetes

• Developer will be responsible for managing back-end services and the interchange of data between the server and the users.

• Your primary focus will be the development of all server-side logic, definition and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end.

• Knowledge of PHP web frameworks (Code igniter, Magento, Laravel etc).

• Should have experience in Word Press, Code igniter / Laravel or at-lease 1 MVC framework of PHP.

• Proficiency in HTML5, CSS3, and JavaScript JQuery.

• Good communication.

• Team worker.

• Ability to handle projects.

• Good problem-solving skills.

• Experience in Microsoft technologies (Microsoft Dot Net, C#, http://asp.net/">NET, MVC, Microsoft SQL, NETcore, Web API, WCF, Bootstrap, JavaScript, Angular JS, Web API, Web services, Rest API)
• Design complex architecture landscape involving API integrations
• Hands-on experience in ASP.Net, C#, MVC, WCF, Restful services, Web API, AngularJS, Entity Framework
• Strong analytical & problem-solving skills
• Must have excellent oral & email communication skills
• Strong analytical and problem-solving skills
• Must have a positive attitude and a yearning to get things done and demonstrate ownership of deliverables