Top Senior Software Engineer Jobs in Hartford, CT

Lead design and implementation of backend services and APIs for payments, billing, settlements, ledgers, and reconciliation. Drive architecture for highly available, auditable financial platforms, integrate with payment processors and banking partners, ensure transactional integrity, observability, and compliance. Deliver end-to-end initiatives, mentor engineers, and operate mission-critical systems with strong emphasis on reliability, security, and scalability.

Design, build, and maintain shared backend platform services (C#/.NET, Node/TypeScript, Postgres/Redis, AWS). Improve reliability, performance, observability, and CI/CD for high-throughput, transaction-heavy workflows. Collaborate with product, payments, data, and infra teams, drive architecture and rollout, mentor engineers, and adopt AI-assisted development practices.

Design and implement control-plane services, CSI drivers, and tooling to provision and operate high-performance storage for Kubernetes AI/GPU workloads. Build observability, data-path, and automation (Terraform/OpenTofu, GitOps) for hybrid, bare-metal, and air-gapped deployments. Integrate enterprise and scale-out storage platforms and ensure secure, declarative provisioning across clusters.

Build and maintain the AI-powered learning platform across a TypeScript/React frontend and Python/FastAPI backend. Integrate LLMs for classification, extraction, personalization, and conversation practice. Design scalable APIs, develop real-time interactive features, apply AI-assisted development workflows, write well-tested code, and collaborate with product, design, and education teams to optimize learning experiences and A/B tests.

Design and implement PostgreSQL internals and indexing strategies for large-scale document workloads. Extend query engine with BSON-aware operators and custom scan nodes, optimize index pruning, profile distributed system performance, collaborate with open-source communities, and lead design/code reviews.

Design and implement PostgreSQL internals, indexing, query engine extensions, and storage-layer features to support large-scale document workloads on Azure. Profile distributed systems, tune performance, collaborate with open-source communities, conduct design/code reviews, and drive cross-team alignment for mission-critical database features.

Design and implement PostgreSQL internals and indexing/query features for large-scale document workloads, extend query engine with BSON-aware operators and custom scan nodes, tune index pruning and storage, profile distributed systems for performance, collaborate with open-source DocumentDB/PostgreSQL communities, and participate in design/code reviews.

Responsible for implementing and managing infrastructure as code (Terracore/Terraform), automating CI/CD with Jenkins, managing AWS services and Amazon EKS/Kubernetes, scripting in Bash/Python, implementing monitoring and security best practices, supporting production via on-call rotations, and collaborating with development and QA teams.

Design, develop, and maintain cloud-native applications using Node.js and React. Implement infrastructure-as-code (Terraform/CDK), deploy CI/CD pipelines, troubleshoot Linux systems, ensure secure AWS deployments, and collaborate with cross-functional teams to operate cloud workloads.

Join an early-stage platform team to scale and mature a mortgage origination platform. Work across the stack to improve distributed systems, performance, observability, and infrastructure tooling, and help define engineering standards and frameworks for growth.

Design, build, and scale backend data infrastructure for an at-home EEG and diagnostics platform. Own PostgreSQL schemas, Kafka-driven event pipelines, GraphQL APIs, dataset snapshot pipelines to the warehouse, and integrations across platform and application teams. Ensure data integrity, idempotency, and operational robustness while collaborating with product, scientific, and clinical stakeholders.

Design, architect, and implement cloud-first full-stack software using Java/C# and JavaScript frameworks. Provide technical leadership, mentor engineers, improve architecture and performance, promote CI and automated testing, and support customer implementation and cloud platform operations.

Design, build, and maintain backend BI tooling, data pipelines, and platform features to generate operational metrics. Improve code quality, scalability, reliability, and performance; implement testing strategies; translate business requirements into technical plans; and mentor junior engineers while collaborating with product and stakeholder teams to deliver data-intensive analytics and reporting solutions.

Own and improve Attentive's first-party data collection across the JS tag, Cloudflare Workers, and Java backend. Expand edge compute capabilities, build agentic AI systems to detect and fix data-quality issues, harden the event ingestion pipeline for reliability and observability, and lead technical direction on a small autonomous team while mentoring engineers.

Lead design, development, and deployment of scalable, fault-tolerant cloud-native microservices. Own architecture, mentor engineers, run on-call rotations, triage production incidents, optimize performance, and collaborate with product and stakeholders to deliver full‑stack and mobile solutions.

Design, implement, and maintain custom test frameworks for Illumina's primary analysis software. Create and expand automated tests, troubleshoot CI/CD pipelines, investigate failures, collaborate with developers to diagnose root causes, and ensure tests are reproducible, documented, and maintainable as analysis capabilities evolve.

Design and develop native Sage Intacct payment integrations and AR/AP workflows, implement APIs/SDKs, ensure PCI-compliant secure architectures, troubleshoot integration issues, collaborate with product/support teams, produce documentation, and monitor/optimize integration performance.

Design, build, and own disposable isolated microVM sandboxes and related runtime infrastructure for AI coding agents. Improve reliability, performance, and security across macOS, Windows, and Linux; lead architecture, mentor engineers, engage open-source communities, participate in on-call rotations, and collaborate with Product and adjacent teams.

Lead design and implementation of scalable data ingestion, transformation, and search systems for security telemetry. Build and maintain event-streaming pipelines, integrate third-party data sources, partner with product stakeholders, apply AI agents for data mapping and correlation, set engineering standards, improve observability and testing, and mentor junior engineers.

Architect and implement latency-critical protocol components (consensus, state sync, mempool) in Rust. Build fault-tolerant distributed systems, optimize throughput and latency, collaborate with research/product, debug live systems, and contribute testing, benchmarking, and release standards.

Lead design, build, and operation of AI-powered product features across backend, frontend, and AI systems. Make architecture decisions, drive production deployments, improve code quality and reliability, mentor engineers, and own features end-to-end.

Provide technical leadership and hands-on engineering across AI, data, backend, and frontend systems. Drive architecture, remove technical risks, set engineering standards, mentor senior engineers, and influence cross-team technical direction.

Lead design and implementation of iOS applications, mentor engineers, coordinate with vendors and operations, ensure delivery within scope/time/budget, and apply modern iOS practices (testing, CI/CD, analytics, async concurrency) to maintain high-quality production apps.

Lead design, development, testing, deployment, and maintenance of cloud-native software. Own complex features, resolve critical incidents, mentor engineers, drive CI/CD and IaC, integrate APIs, databases, eventing, observability, and apply Agile practices to deliver production-ready solutions.

Design, build, and operate highly available cloud platform services that power CI/CD, release orchestration, compliance automation, and developer productivity across Azure DevOps and GitHub. Drive architecture, automation, observability, operational excellence, and apply AI and data to improve engineering workflows. Provide technical leadership, mentor engineers, and champion secure engineering and software supply chain protections.