Senior Backend Software Engineer

Kensho is S&P Global’s hub for AI innovation and transformation. With expertise in machine learning, natural language processing, and data discovery, we develop and deploy novel solutions to innovate and drive progress at S&P Global and its customers worldwide. Kensho's solutions and research focus on business and financial generative AI applications, agents, data retrieval APIs, data extraction, and much more. At Kensho, we hire talented people and give them the autonomy and support needed to build amazing technology and products. We collaborate using our teammates' diverse perspectives to solve hard problems. Our communication with one another is open, honest, and efficient. We dedicate time and resources to explore new ideas, but always rooted in engineering best practices. As a result, we can innovate rapidly to produce technology that is scalable, robust, and useful. Kensho’s Applications group develops the web apps and APIs that deliver Kensho’s AI capabilities to our customers. Our teams are small, product-focused, and intent on shipping high-quality code that best leverages our efforts. We’re collegial, humble, and inquisitive, and we delight in learning from teammates with backgrounds, skills, and interests different from our own. As a Senior Backend Engineer, you will develop reliable, secure, and performant APIs that apply Kensho’s AI capabilities to specific customer workflows. You will collaborate with colleagues from Product, Machine Learning, Infrastructure, and Design, as well as with other engineers within Applications. You have a demonstrated capacity for depth, and are comfortable working with a broad range of technologies. Your verbal and written communication is proactive, efficient, and inclusive of your geographically-distributed colleagues. You are a thoughtful, deliberate technologist and share your knowledge generously. Kensho states that the anticipated base salary range for the position is 150k–225k. In addition, this role is eligible for an annual incentive bonus and equity plans. At Kensho, it is not typical for an individual to be hired at or near the top of the range for their role and compensation decisions are dependent on the facts and circumstances of each case. What You’ll Do Design, develop, test, document, deploy, maintain, and improve softwareManage individual project priorities, deadlines, and deliverablesWork with key stakeholders to develop system architectures, API specifications, implementation requirements, and complexity estimatesTest assumptions through instrumentation and prototypingPromote ongoing technical development through code reviews, knowledge sharing, and mentorship What You'll Need At least five years of direct experience developing customer-facing APIs within a teamThoughtful and efficient communication skills (both verbal and written)Experience developing RESTful APIs using a variety of toolsExperience turning abstract business requirements into concrete technical plansExperience working across many stages of the software development lifecycleSound reasoning about the behavior and performance of loosely-coupled systemsProficiency with algorithms (including time and space complexity analysis), data structures, and software architectureAt least one domain of demonstrable technical depth Technologies & Tools We Use Development: Python, Flask, FastAPI, Django REST Framework, PostgreSQL, Celery, RabbitMQ, Redis, Kafka, Jsonnet, Agentic Coding Tools (Claude Code, Codex, Cline)Operations: AWS, Amazon EKS, Sentry, Prometheus, Git, Jenkins, Github Actions At Kensho, we pride ourselves on providing top-of-market benefits, including:   Medical, Dental, and Vision insurance   100% company paid premiums  Unlimited Paid Time Off  26 weeks of 100% paid Parental Leave (paternity and maternity)  401(k) plan with 6% employer matching  Generous company matching on donations to non-profit charities  Up to $20,000 tuition assistance toward degree programs, plus up to $4,000/year for ongoing professional education such as industry conferences  Plentiful snacks, drinks, and regularly catered lunches  Dog-friendly office (CAM office)  Bike sharing program memberships  Compassion leave and elder care leave  Mentoring and additional learning opportunities  Opportunity to expand professional network and participate in conferences and events  Recruitment Fraud Alert If you receive an email from a spglobalind.com domain or any other regionally based domains, it is a scam and should be reported to reportfraud@spglobal.com. S&P Global never requires any candidate to pay money for job applications, interviews, offer letters, “pre-employment training” or for equipment/delivery of equipment. Stay informed and protect yourself from recruitment fraud by reviewing our guidelines, fraudulent domains, and how to report suspicious activity here. We are an equal opportunity employer that welcomes future Kenshins with all experiences and perspectives. Kensho is headquartered in Cambridge, MA, with an additional office location in New York City. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin. Job ID: 327222 Posted On: 2026-04-14 Location: Cambridge, Massachusetts, United States