Ready to make a real impact in cybersecurity? At Critical Start, we're not just protecting organizations; we're redefining how it's done. We're a team united by an inspiring purpose: to stop breaches, simplify security, and shape the future of cyber defense. If you're passionate about cutting-edge technology, thrive in a collaborative environment, and want your work to truly matter, you've found your home.

We deliver 24x7 AI-accelerated, human-validated detection, investigation, and response across IT and OT. This means we cut through the noise, investigate real threats, and take trusted, SLA-backed action—all powered by the brightest minds and the latest AI. Since 2012, we've been helping organizations outpace evolving attacks with faster response, fewer escalations, 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 customers 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.

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.

• 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.

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.

Imagine a dynamic, enjoyable, and rewarding work environment. We are professionals, and the work we do holds immense significance, like saving our customers from potential disasters. However, we believe in not taking ourselves too seriously. 

Prefer a casual dress code every day? No problem, as we find comfort enhances our thinking. 

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/