Senior Backend Software Engineer, AI Observability & Evals Platform (LangSmith)
$175k - $225kLangChain
Senior Backend Engineer
In person 5 days/week in San Francisco, Boston, MA, New York.
We are looking for a Senior Backend Engineer to join us. In this role you will be building the backend systems that power LangChain's observability and evals platform. You will work on the core services that allow developers to monitor and evaluate their AI applications at scale. While the focus is on backend feature development, familiarity with fullstack or frontend engineering, performance tuning, and debugging production issues would be extremely valuable.
What You'll Do
- Design, develop, and maintain backend services and APIs to support LangSmith's tracing, monitoring, and evaluation workflows.
- Collaborate on architectural decisions to ensure systems are performant and maintainable.
- Optimize storage and query performance for high-volume observability and evaluation data.
- Ensure system reliability through strong testing, monitoring, and alerting practices.
- Troubleshoot and resolve production issues, performing root-cause analysis and implementing long-term fixes.
- Create and maintain technical documentation, including system design and API references.
- Work closely with full-stack engineers, product managers, and product designers on rolling out new features.
What You'll Bring
- 5+ years of professional experience in backend engineering working on highly complex products
- Proficiency in one or more backend languages/frameworks, ideally Python or Go
- Strong understanding of API design and building reliable data services.
- Experience with high-throughput or mission-critical systems.
- Demonstrated ability to optimize backend services for performance and reliability.
- Experience with database systems (Postgres, Redis, Clickhouse), and cloud platforms (AWS, GCP, Azure)
- Strong communication skills, with the ability to collaborate cross-functionally
- Customer centricity and ownership mentality
Compensation
Annual salary range: $175,000- $225,000
Compensation Philosophy:
We offer competitive compensation that includes base salary, variable compensation for relevant roles, meaningful equity, benefits, and perks. Actual compensation and offerings will vary based on role, level, and location. Team members in the EU, UK, and APAC receive locally competitive benefits aligned with regional norms and regulations.
Benefits
Benefits include medical, dental, and vision coverage, flexible vacation, a 401(k) plan, meals on in-office days in the US and more.
$145k - $180k
...Fullstack Engineer We're looking for a Fullstack Engineer to work on LangSmith, our commercial AI observability and evals platform product. In this role, you'll have... ...of experience in software engineering working on... ...Go or Python on the backend and React + Typescript...PlatformWork at officeFlexible hours$175k - $240k
...Frontend Engineer At LangChain, our mission is... ...to production-ready AI agents that teams can... ...grown to also offer a platform for building, evaluating... ...platform includes LangSmith (Observability, Evaluation, Deployment... ...Collaborate with fullstack and backend developers and UX/UI...PlatformSeniorWork at officeFlexible hours$230k - $270k
...Principal/Lead Software Engineer The LangSmith team owns and builds LangChain's core platform for observability, evaluation, and production reliability of AI systems. From tracing and annotation to run... ...build across the full stack from backend services and APIs to frontend...PlatformWork at officeFlexible hours- ...within Oura's HealthOS platform. It ingests data... ...LLM-powered reasoning engines, mobile apps, and... ...documentation How We Build With AI At Oura, AI is a... ...of how we build software. We encourage senior engineers to use... ...code (AWS CDK, Pulumi) Observability tooling: Grafana,...PlatformSeniorWork at officeLocal areaRemote workFlexible hours
$170k - $190k
...WeightWatchers, our Engineering Team drives transformative... ...telehealth platform, optimizing medication... ...headfirst into exciting AI integrations we lead... ...What you will do As a Senior Backend Engineer, you will be... ...inconsistencies and improve system observability. Robust Interfaces:...PlatformSeniorWorldwide$150k - $215k
...Senior Software Engineer (Backend, Enterprise) At WHOOP, our mission is to unlock... ...healthspan. Our enterprise platform helps organizations across... ...customers Develop and maintain observability, monitoring, and... ...web applications leveraging AI tools (e.g., React), even...PlatformSeniorFull timeWork at officeRelocation- ## Senior Backend EngineerApplylocations: Remote Canada... ...delivers AI that maximizes impact... ...business risk. Our platform and applications integrate... ...team is the engine at the heart of... ...that are resilient, observable, and require minimal... ...knowledge of software architecture for large...PlatformSeniorHourly payLocal areaRemote workWorldwideFlexible hours1 day per week
$150k - $215k
...motivated and skilled engineers to our team to... .... The AI Platform team at WHOOP is... ...empower product and software teams to... ...experiences. As a Senior Software Engineer... ...Generative AI Develop backend features and... ...and maintain observability and monitoring systems...PlatformSeniorFull timeWork at officeRelocation- ...computing, and verified AI code-generation to... ...-generation wargaming platforms. If building ultra-low... ...continuously —automate CI/CD, observability, and security... ...no passengers—every engineer ships code that matters... ...years building production backends in modern Python , with...PlatformSeniorRelocation packageFlexible hours
- ...provide the agent engineering platform and open source... ...control. LangSmith offers observability, evaluation, and... ...worldwide and powers AI teams at... ...LangChain is hiring a Senior Fullstack... ...Extensive fullstack software development... ...Redis, and modern backend infra Startup...PlatformSeniorWorldwideFlexible hours
$121.5k - $145.5k
...seeking a seasoned Sr. Software Engineer in the North... ...role will sit in the Platform team that focuses on building AI Platform to... ...oriented code in our backend services. Develop... ...alignment with other senior engineers.... ...evaluation frameworks, observability, and guardrails to...PlatformSeniorRemote workFlexible hours$148k - $249k
...Waabi, founded by AI visionary Raquel Urtasun, is the leader... ..., and need to expand our observability and monitoring capabilities... ...to validate hardware and platform choices. - Analyze and optimize... ...Qualifications: - 5+ years software engineering or systems/performance...PlatformSeniorFull timeWork at officeWork from homeFlexible hours- ...Senior Backend Software Engineer - Rust & Serverless (Remote)RemoteSURT AIJoin the Future of Fraud DetectionWe develop advanced systems that provide... ...with IaC (Terraform) is highly recommended.Data & Observability: You've managed NoSQL databases (DynamoDB) and have a disciplined...SeniorRemote work
$133.65k - $220.68k
...Job Summary: The Red Hat Observability Service team is looking for a Senior Software Engineer to join us in the USA. The role collaborates... .... Proactively leverage AI technologies to streamline... ...and/or OpenShift 4. ~ Cloud Platforms: Understanding and awareness of...PlatformSeniorPermanent employmentFull timeContract workWork experience placementWork at officeRemote workFlexible hours- ...Your Mission We're hiring a Senior Backend Engineer to advance our Real-Time Bidding... ...Dataflow, BigQuery, Vertex AI). If you have a track record... ...of 5 years of professional software engineering experience,... ...experience with Google Cloud Platform (GCP) Exposure to the end-to...PlatformSeniorRemote workHome officeFlexible hours
$148.5k - $190k
...Arbiter is the AI-powered care orchestration system... ...-facing Agentic platform to optimize patient outcomes... ...looking for expert engineers and leads to join our... ...Responsibilities As a Senior Backend Engineer, you will engineer... ...operating production software systems. Recent...PlatformSeniorWork experience placementRemote work- ...Senior AI Engineer About Supernal Supernal helps... ...on a proprietary platform. We deliver... ...services (Django backend, event-driven systems... ..., Kubernetes, observability) while owning critical... ...Offline/online evals, regression... ...Required Strong software engineering fundamentals...PlatformSeniorFull timeTemporary workRemote work
$150k - $200k
...Senior Software Engineer (Backend) Title of Role: Senior Software Engineer (Backend) Location: Boston... ...enhance patient care through innovative AI solutions. This company is at the... ...architecture. ~ Experience working with cloud platforms, particularly AWS, to build and...PlatformSeniorWork at office$150k - $200k
...Senior Back-End Engineer Blitzy is a Cambridge, MA based AI software development platform on a mission to revolutionize the software development life cycle by autonomously building... ...with several of the following: Backend frameworks: Python, Node.js, NuxtJS, or...PlatformSeniorWork at officeWork from homeFlexible hours$126k - $160k
...makes market‑leading software that empowers scientists... ...SaaS Signals Research Platform that provides... ...materials. Join us as a Senior Backend Software Developer - AISolutions... ...integrating advanced AI capabilities into our... ...professional software engineering experience 5+ years of...PlatformSeniorFull timeTemporary workPart timeImmediate startRemote work- Hubspot is seeking a Senior Machine Learning Engineer II to develop AI experiences in Cambridge, Massachusetts. This... ...role focuses on designing robust backend systems that enable efficient context... ...include building platform capabilities for handling significant...PlatformSeniorRemote job
$152k - $230k
...on a mission to engineer a frictionless,... ...advanced AI and cutting-edge... ...building the internal platform and tooling... ...’re hiring 2 x Senior Full Stack Engineer... .... Nurture Backend Infrastructure:... ...monitoring and observability tools (such as... ..., DataDog, and LangSmith) directly into...PlatformSeniorH1bWorldwideFlexible hours$195k - $215k
...our members and our team. As a Backend Engineer on the Velocity team , you’ll... ...Tinder. Velocity builds the systems, AI-driven tools, and internal platforms that let product and engineering... ...Familiarity with service mesh, observability stacks, or RAG systems $195,000...PlatformSeniorWork experience placement$93k - $124k
GE Aerospace is seeking a Sr. Data Engineer to architect automation and observability for the EDAS platform, emphasizing data consumption. Responsibilities include building observability frameworks, implementing monitoring tools, and optimizing data pipelines for scalability...PlatformSeniorRemote job$150k - $200k
A leading AI software development firm located in Cambridge, MA is seeking a Senior Back-End Engineer to take ownership across their tech stack. The ideal candidate will collaborate with the CTO and founding team, leveraging Python and Terraform to solve challenging engineering...PlatformSenior- Senior Machine Learning Engineer II Engineering Remote - United... ...of AI experiences across... ...the context platform layer that powers... .... This is a backend‑leaning ML... ...shipping production software — designing... ...(offline evals, golden datasets... ..., observability, performance,...PlatformSeniorFor contractorsRemote work
$186.07k - $218.9k
...the emerging onchain platform — and with it, the future... ...seeking experienced backend engineers to join our team to build... ...product managers and senior leadership to turn our... ...of experience in software engineering. You’ve... ...Coinbase is piloting an AI tool based on machine...PlatformSeniorLocal area$90k - $125k
...seeking an exceptional Backend Engineer to join and help... ...working closely with senior engineers to deliver production... ...: Improve observability, monitoring, and alerting... ...combating climate change: AI-Powered Climate Tech... ...per Pave Compensation Software. We’re also proud to offer...PlatformSeniorFull timeLocal areaFlexible hours- DataRobot, Inc. is seeking a Senior Backend Engineer to join our AI Compute team in Boston, Massachusetts. The role involves developing and supporting... ..., and ensuring the operational excellence of our platform. The ideal candidate will have over 5 years of experience...PlatformSeniorRemote jobFlexible hours
- Medium is seeking a Senior CAD Backend Engineer in Boston, MA. You will build backend integrations and automation for the AI Engineering platform, connecting CAD systems to cloud services. Responsibilities include designing backend services in Python and integrating with...PlatformSenior
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Senior Backend Software Engineer, AI Observability & Evals Platform (LangSmith). Be the first to apply!
- back-end developer Cambridge, MA
- backend software engineer Cambridge, MA
- client platform engineer Cambridge, MA
- senior platform engineer Cambridge, MA
- platform developer Cambridge, MA
- platform engineer Cambridge, MA
- senior development executive Cambridge, MA
- senior manager data science Cambridge, MA
- senior procurement Cambridge, MA
- senior director product management Cambridge, MA


