Vista Equity Partners is a leading global investment firm focused exclusively on enterprise software, data, and technology-enabled businesses. With over $100B+ in assets under management and a portfolio of 90+ companies worldwide, Vista accelerates growth through operational excellence, shared expertise, and long-term partnership. In India, Vista’s presence continues to expand with 45+ portfolio companies employing more than 17,000 professionals across technology, product, customer success, and operations – reinforcing India’s strategic role as a hub of innovation and talent within the Vista ecosystem. 

Through its Agentic AI Factory, Vista is embedding Generative AI across its global portfolio, enabling companies to integrate intelligent, responsible AI into products, operations, and decision-making. This initiative is strengthened through portfolio-wide learning programs, leadership workshops, and AI hackathons that foster innovation, build fluency, and accelerate practical AI adoption across teams. 

Critical Start, a Vista-backed company, is on a mission to stop breaches, simplify security, and shape the future of cyber defense. We deliver 24x7 AI-accelerated, human-validated detection, investigation, and response across IT and OT, helping organizations outpace evolving threats with faster response and measurable risk reduction.  

Innovation isn't just a buzzword here; it's our DNA. We pioneered the first MOBILESOC app for on-the-go detection and response, infused AI into automated alert resolution to eliminate noise, and slashed investigation time by an astounding 99.3%. We're transforming how security teams work, and you could be a part of it. From AI-assisted triage to analyst copilots that elevate human expertise, we combine machine intelligence with human judgment to deliver outcomes our customer's trust. 

If you're looking for a high-trust, high-impact team where your ideas are amplified by AI and valued by colleagues and customers alike, Critical Start is the place for you. Come build the future of cybersecurity with us. 

With Vista’s investment and strategic guidance, we combine the agility of a growth-stage company with the scale, stability, and career opportunities of a global technology network. Our teams are empowered to innovate, collaborate, and build meaningful solutions that drive measurable outcomes for customers worldwide. 

Our Employee Value Proposition (EVP)  

At Critical Start Technologies Private Ltd., our people are our greatest advantage, and we empower our team to make a real impact by transforming how the world defends against cyber threats. Our employee value proposition reflects what we stand for and the experience we create for every team member: 
 

• Purpose-Driven Mission 
  Join a team united by a clear and inspiring purpose: to stop breaches, simplify security, and shape the future of cyber defense. Every role directly contributes to protecting organizations and strengthening global resilience. 
   

• Innovation at the Core 
  Innovation is in our DNA. From pioneering the first MOBILESOC app to leveraging AI to reduce investigation time by 99.3%, we continuously push boundaries. Team members can work with cutting-edge technologies that redefine what’s possible in cybersecurity. 
   

• Human + AI Collaboration 
  We combine the best of machine intelligence and human judgment to deliver trusted outcomes. You’ll work in an environment where AI elevates expertise—through AI-assisted triage, automated alert resolution, and analyst copilots—empowering you to focus on high-impact work. 
   

• High-Trust, High-Impact Culture 
  We thrive on collaboration, transparency, and shared success. Your ideas are valued, your growth is supported, and your contributions drive meaningful results. This is a place where your work truly matters. 

Together, these pillars define what it means to work at Critical Start, a place where you can do the most meaningful work of your career, supported by Vista’s global ecosystem. Vista’s ecosystem enables purposeful career mobility and sustained professional growth. Employees benefit from the ability to build diverse experiences, collaborate with high-performing peers across portfolio companies, and progress into new roles within a global network of leading enterprise software organizations. This shared talent environment strengthens capabilities, broadens perspective, and supports long-term career development across the Vista portfolio. 

Join us and let’s build the future of cybersecurity together! Want to hear from our team? Watch these videos to gain insights into life at Critical Start or check out our Glassdoor reviews for an inside look. 

We are seeking a Senior Software Engineer to join the Critical Start Technologies Private Ltd. team, operating under the Critical Start umbrella, for our India operations. As a Senior Software Engineer on the Backend Team, you will contribute to the design, development, testing, deployment, maintenance, and enhancement of Cloud Backend Services and Interfaces (including supporting APIs) used by Critical Start customers and employees. In addition to this, you are going to work on distributed systems utilizing the relevant concepts, patterns and practices in your day to day work.

Critical Start Teams take full ownership for delivering high-quality solutions and continually improving team performance. Team members are expected to be versatile, display leadership qualities, be skilled at working through ambiguity, and enthusiastically deliver delightful solutions for end users, while continuously pushing technology forward.

This role is designated as a hybrid position. You are required to have a reliable high-speed internet connection, the ability to participate in video meetings, and a dedicated home office or private workspace suitable for professional work. As the position involves collaboration with U.S.-based teams and clients, you will be expected to work during overlapping hours with U.S. business hours, as guided by your manager.

In this role, you will be responsible for driving impact by contributing to our engineering function. You'll collaborate with cross-functional teams, apply your expertise to real-world challenges, and deliver solutions that improve outcomes for customers worldwide. Your day-to-day will include the following responsibilities: 

• Develop, test, and deploy scalable and maintainable microservices and API interfaces Python, Celery, Redis, RabbitMQ, that uses PostgreSQL, ElasticSearch and other relational or document databases.
• Design, develop, and maintain microservices to support front-end functionality and mobile applications.
• Design and develop RESTful APIs to ensure seamless communication between front-end and microservices.
• Work on API versioning, documentation, and testing to ensure robust and reliable API services.
• Design and develop code based on distributed systems concepts, patterns and industry best practices.
• Strong focus on quality of the code with unit testing and integration testing while developing and enhancing services and APIs.
• Lead and participate in reviews with peers and stakeholders to decide on solution architecture design.
• Review code developed by other engineers and provide feedback to ensure best practices (e.g., style guidelines, accuracy, maintainability, testability, and efficiency) and quality of deliverables.
• Contribute to existing documentation or educational content. Adapt content based on product/program updates and user feedback.
• Triage, resolve, and determine the root cause of production issues. Form action plans to prevent or minimize the impact of similar issues in the future.
• Design and automate required workflows using scripting languages (e.g., Python, Shell).
• Work with teams in India as well as with Global teams as needed.

We’re seeking a candidate who brings passion, curiosity, and a drive for excellence. The ideal profile includes: 

Required Qualifications:

• Possession of a Bachelor’s degree or an equivalent level of practical experience.
• 5+ years of experience in backend development using distributed computing and modern frameworks FastAPI, Celery and also caching technologies such as Redis.
• This is a backend centric role which requires expert level competency in Python, Celery and micro services with a proficiency in RabbitMQ and databases RDBMS - PostgreSQL and ElasticSearch.
• 3+ years of practical experience with data structures and algorithms in an industry setting.
• 3+ years of experience working in an agile environment within an industry setting.
• 3+ years of proficiency with Git workflow, including pull requests.
• This role is designated as a hybrid position. You are required to have a reliable high-speed internet connection, the ability to participate in video meetings, and a dedicated home office or private workspace suitable for professional work. As the position involves collaboration with U.S.-based teams and clients, you will be expected to work during overlapping hours with U.S. business hours, as guided by your manager.

Preferred Qualifications:

• 2+ years of expertise in developing high performance low latency distributed cloud services (MSA).
• Hands-on experience in managing AWS resources (S3, EC2, ECS, etc.) using Terraform.
• Possession of a Master's degree in Computer Science or a related technical field.

Joining Critical Start Technologies Private Ltd. means contributing to a mission-driven team while being part of the broader Vista portfolio family. You’ll have the opportunity to innovate, grow your career, and help share the future of Critical Start in India, while staying connected to peers and leaders across Vista’s global network. We offer a dynamic, supportive, and engaging work environment where meaningful work and a relaxed, comfortable culture go hand in hand! 

Be part of something bigger. Build your career with Critical Start, powered by Vista. 

What does our Compensation and Benefits package entail? 

• Competitive salary  
• Statuary PTO (Paid Time Off) policy 
• Depending on the role, you may work in the office, remotely, or adopt a hybrid work model.  

We prioritize your privacy and security. Please note that Critical Start will never request financial information or sensitive personal data during the interview process. If you encounter any suspicious requests, do not respond and contact us directly at recruiting@criticalstart.com. Thank you for helping us maintain a safe and trustworthy hiring experience.

Critical Start welcomes people from all backgrounds and walks of life. One of our core values is to “Do what’s best for our employees,” and that starts with the hiring process by finding the best candidates and providing an environment that upholds equal employment opportunities for all employees and applicants, strictly prohibiting any form of discrimination or harassment based on race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. 

This policy encompasses all aspects of employment, including recruitment, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training. 

Mental and Physical Requirements 

It's important to note that specific physical and mental requirements may vary depending on the nature of the office job, organization, and individual responsibilities. 

Physical:  

• Stationary position for extended periods of time. 
• Constantly operate a computer.  
• Occasionally you may be required to move equipment or other items up to 20 lbs. 
• The ability to communicate information and ideas so others will understand. Must be able to exchange accurate information in these situations. 

Mental:  

• Must be able to apply established protocols in a timely manner. 
• Make timely decisions in the context of workflow. 
• Ability to complete tasks and perform in situations requiring speed deadlines, or productivity quota. 
• Ability to work effectively and efficiently in high stress situations. 
• Ability to simultaneously address multiple complex problems. 

How to Apply:  

Interested candidates are invited to visit our career site and apply for the position: https://www.criticalstart.com/careers/