Source Job

$92,880–$131,760/yr
Spain

  • Own and deliver quarterly technical goals for the Communications area, solving ambiguous problems in messaging infrastructure.
  • Design and scale reliable backend services for high-volume communications across multi-region, multi-tenant environments.
  • Collaborate with product, design, analytics, and engineering partners while mentoring teammates and supporting on-call rotation.

Python Kotlin AWS Kubernetes Distributed Systems

20 jobs similar to Senior Software Engineer (Comms Core)

Jobs ranked by similarity.

$77,000–$107,000/yr
Poland

  • Own and deliver quarterly technical goals for the Communications area.
  • Design reliable backend services for high-volume, multi-region messaging infrastructure.
  • Collaborate with engineering partners and support on-call operations.

Affirm builds honest financial products that give people a clear, predictable way to pay over time with no hidden fees. It is a remote-first company focused on reliable, performant, and scalable engineering solutions.

$78,840–$117,720/yr
Spain Unlimited PTO

  • Break down complex projects into tasks and deliver them in phases with your team.
  • Collaborate with product, design, and analytics to build scalable card experiences.
  • Support operations and on-call efforts, improving system reliability and availability.

Affirm is a financial technology company that offers clear, predictable pay-over-time solutions with no hidden fees. It is a remote-first company with a collaborative culture focused on transparency, flexibility, and employee well-being through comprehensive benefits.

$64,750–$94,750/yr
Poland

  • Break down projects into tasks and deliver them in phases with your team.
  • Partner with product, design, and analytics to build scalable backend systems.
  • Monitor metrics, support on-call, and contribute to code reviews.

Affirm exists to give people a clear, predictable way to pay over time, with no hidden fees. It is a remote-first company that cares about employee well-being through comprehensive benefits and an inclusive culture.

$146,000–$225,000/yr
US Unlimited PTO

  • Break down larger projects into individual tasks and deliver them in phases with support from your tech lead and manager.
  • Collaborate with product management, design, and analytics to make decisions that consider risks and trade-offs.
  • Support operations and availability of your team's artifacts by creating metrics and participating in on-call efforts.

Affirm is a financial technology company that provides transparent, flexible payment solutions. The company is remote-first and fosters a culture of care, transparency, and flexibility.

$204,000–$290,000/yr
US Unlimited PTO

  • Set technical strategy for the team and drive large-scale, business-impacting projects.
  • Collaborate with product, design, and analytics to ensure technical sustainability and manage trade-offs.
  • Foster engineering quality and talent development through code review standards and mentorship.

Affirm is a financial technology company that provides transparent, flexible payment solutions, allowing consumers to pay over time without hidden fees. The company is remote-first and values inclusivity, offering competitive benefits and a collaborative culture.

US Unlimited PTO

  • Design and implement backend systems for trust and safety at scale.
  • Collaborate with product, design, and analytics to ensure technical sustainability.
  • Foster a culture of quality through code reviews, design standards, and mentoring.

Affirm provides a clear, predictable way to pay over time with no hidden fees. It is a remote-first company with a focus on engineering excellence and scalable solutions.

Canada Unlimited PTO

  • Own and deliver quarterly goals, leading engineers through ambiguity and ensuring support.
  • Collaborate with product, design, and analytics to make decisions considering risks and trade-offs.
  • Support operations and availability of team artifacts while fostering quality and ownership.

Affirm provides clear, predictable buy now, pay later services with no hidden fees. It is a growing, remote-first company that values transparency, flexibility, and customer trust.

US Unlimited PTO

  • Break down larger projects into individual tasks and deliver them in phases.
  • Collaborate with product management, design, and analytics on technical decisions.
  • Support the operations and availability of team artifacts through monitoring and on-call efforts.

Affirm provides a clear, predictable way to pay over time, with no hidden fees. The company is a remote-first fintech that values transparency and care, offering comprehensive benefits and a collaborative culture.

US Unlimited PTO

  • Drive technical strategy for the card loan platform by leading planning and execution of projects.
  • Design and develop large-scale, high-availability services with robust APIs and data models.
  • Collaborate across functions with product, analytics, and other teams to define requirements and execute card loan strategy.

Affirm provides a clear, predictable way to pay over time for purchases, with no hidden fees. It is a remote-first company experiencing explosive growth and fostering a culture of care, transparency, and flexibility.

US Unlimited PTO

  • Build and operate the control plane for large-scale distributed SQL databases like MySQL and TiDB.
  • Design and execute zero-downtime schema and data migrations across multi-tenant clusters.
  • Own the networking stack connecting services to storage on Kubernetes, including proxies like ProxySQL.

Affirm provides honest financial products that give people a clear, predictable way to pay over time. It is a remote-first company focused on care, transparency, and flexibility, with a culture that supports diversity and inclusion.

Canada Unlimited PTO

  • Work with technical leaders to design and implement forward-looking approaches for checkout systems.
  • Own components of checkout systems and define their long-term health.
  • Collaborate with engineers to build the next generation of the checkout platform.

Affirm provides a clear, predictable way to pay over time through buy now, pay later solutions. It is a remote-first company with a culture focused on honesty, trust, and customer-centric innovation.

$170,000–$235,000/yr
US

  • Design and implement backend services for licensing, entitlements, feature access, and usage limits across NodeZero's product and APIs.
  • Build and evolve provisioning, admin experience, MSP/MSSP capabilities, and audit logging for a multi-tenant SaaS platform.
  • Operate production services with monitoring, incident response, and a high bar for design quality and test coverage.

Horizon3 is a fast-growing, remote cybersecurity company that helps organizations proactively find, fix, and verify exploitable attack vectors through its NodeZero autonomous pentesting platform. The team is a fusion of former special operations cyber operators and startup engineers, fostering a culture of respect, collaboration, ownership, and results.

Mexico

  • Architect and evolve core control and context planes, including service registries, SLO enforcement, and automated canary releases.
  • Own the service chassis and golden path, maintaining multi-language Java/Python libraries, Helm charts, and deployment pipelines.
  • Drive reliability engineering practices, mentor engineers, and lead architectural strategy for distributed systems at production scale.

The company builds large-scale web data products and distributed engineering infrastructure for AI-driven workflows. It operates a remote-first, globally distributed engineering culture focused on reliability, autonomy, and technical excellence.

North America

  • Take deep ownership of key systems and product areas, becoming the technical expert and primary point of reference.
  • Architect, build, and maintain highly available and scalable REST APIs and backend services.
  • Use agentic development workflows and AI coding tools as standard engineering practice.

This partner company builds an AI-driven e-commerce messaging platform powered by customer context and data. It is a high-growth, remote-first environment with a collaborative and supportive culture.

Brazil

  • Own SMB acquisition funnel services end to end, building high-throughput backend apps in Kotlin and Go.
  • Drive event-driven architecture and asynchronous messaging with Kafka, ensuring resilience.
  • Partner with Product, Marketing, and Sales to optimize conversion funnels and scale architecture.

Wellhub is a workplace wellness platform connecting employees to fitness, mindfulness, therapy, nutrition, and sleep via one subscription. Headquartered in NYC with a global team, it values wellbeing, collaboration, and diverse perspectives.

$166,900–$230,900/yr
US

  • Design, develop, and evolve high-performance, real-time pricing systems for critical lending decisions.
  • Lead complex engineering projects from technical design through production deployment, ensuring scalability and reliability.
  • Collaborate with data scientists, product managers, and business stakeholders to turn models into robust software solutions.

This company builds core pricing infrastructure that powers critical lending decisions across financial products. It offers a remote-first environment with a collaborative culture across engineering, data science, and product teams.

North America Unlimited PTO

  • Take deep ownership of systems and product areas, becoming the go-to technical expert for what you own.
  • Architect, build, and maintain highly available, scalable REST APIs and backend services across distributed systems.
  • Build agentically with AI coding tools, staying at the forefront of emerging AI tooling and practices.

Postscript is an AI messaging platform for Shopify brands, helping e-commerce marketers drive revenue through SMS marketing and AI features. Backed by Greylock and Y Combinator, the company has been fully remote since 2018 and serves 20,000+ Shopify brands with a culture of ownership and AI-first development.

$3,000–$5,000/mo
Costa Rica

  • Architect bespoke AI-driven simulations and core services for realistic cyber range training.
  • Lead projects and mentor engineers on best practices for distributed, event-driven systems.
  • Partner across teams to deliver fault-tolerant, containerized solutions in air-gapped environments.

SimSpace provides an AI-powered cyber training and simulation platform for governments, militaries, and enterprises to test and validate defenses. Trusted by experts from U.S. Cyber Command, it fosters a human-centered culture of continuous learning and collaboration.

Europe 5w PTO

  • Build and operate Python/Django services for repairs, payments, messaging, notifications, and fraud prevention.
  • Work in cross-functional product teams using AI-assisted, spec-driven development from design through delivery.
  • Ensure reliability and data integrity through automated testing, observability, security, and incident response.

Plentific is a property technology platform for housing providers, local authorities, and contractors in the UK and Germany. We are a growing London-headquartered team working across Europe to expand the platform and integrate AI.

Europe

  • Guide architectural decisions across products, reviewing solutions from internal teams and vendors.
  • Establish shared engineering standards and modernise legacy systems for reliability and cost-effectiveness.
  • Define guardrails for production LLM systems and collaborate with teams on Kubernetes and cloud infrastructure.

INFUSE is a technology company that develops software products, including AI and LLM-based solutions, across a large engineering landscape. Its software department spans 500+ repositories and fosters a remote-first culture with access to cutting-edge AI tools and human-centric values.