Principal Software Engineer

Sinch Operator Software AB

DESCRIPTION Sinch Telco is a standalone business within Sinch. Our products propel communications services for mobile operators and enterprises around the globe. We are looking for a Principal Software Engineer with focus on AI-driven Development, to accelerate adoption of AI-powered development practices across Sinch Telco. In this role, you’ll be a hands-on practitioner, leveraging AI agents to design, build and deliver software while shaping how AI is applied in real engineering environments. Together we will move toward a paradigm where software developers manage teams of specialized virtual AI agents for requirements analysis, implementation, testing, documentation, and deployment. We intend to unlock new capabilities that enable teams to build and ship faster with higher quality, security, and maintainability. You see the future of AI-driven development clearly but understand that progress requires practical steps and patience. You demonstrate value through hands-on work and tangible results. You collaborate well with experienced colleagues as a peer and respect existing domain knowledge while contributing new perspectives and influence through quality of work. You are self-directed, proactive, and comfortable operating with ambiguity. The AI tooling landscape changes rapidly and you are energized by this pace. As our Principal Software Engineer, you will: Act as a highly productive, hands-on software engineer using AI agent orchestration to deliver features and products across multiple areas Define, evolve, and scale best practices, workflows, and tooling for AI-assisted development across coding, testing, documentation, and deployment. Evaluate, select, and configure emerging AI development tools and agent frameworks. Create reusable agent configurations, custom instructions, and workflows tailored to the organization's codebases. Partner with engineers, architects, and product managers to define clear requirements and product direction using a product management-informed perspective. REQUIREMENTS 8+ years of software engineering experience with proven ability to design, evaluate, and evolve software architectures. Solid understanding of distributed systems, APIs, and system integration. Experience with telecom systems, BSS/OSS, messaging infrastructure, or CPaaS is a plus. Hands-on experience applying AI-assisted development tools such as Copilot, Cursor, Claude, in real-world software delivery, not just experimentation. Experience working with AI-driven and agent-based development workflows, including autonomous coding agents and multistep task orchestration. Ability to define clear, structured, and decomposable requirements for both engineers and AI agents, with strong product awareness and understanding of the “why” behind solutions. Practical experience with Model Context Protocol, tool-use patterns, or equivalent integration standards for reliable multi-agent/tool orchestration. Experience with multi-agent frameworks such as CrewAI, AutoGen, LangGraph is a plus. Strong communication skills, with the ability to articulate technical concepts, document approaches, and collaborate effectively across teams. Our corporate language is English, please submit your application in English. We are not supporting relocation at this time. Applicants must either hold a Swedish or EU/EEA citizenship or have a valid Swedish work permit. OUR HIRING PROCESS We are committed to ensuring a recruitment process that is fair, objective, consistent, and inclusive. We believe in a two-way process and encourage you to ask questions throughout the journey. If this role isn't what you're looking for, please explore the other opportunities listed on our career page: https://www.sinch.com/careers/. No matter who you are, we hope you find an exciting path forward - hopefully with us!

Freeform

PRINCIPAL SOFTWARE ENGINEER  Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits.  As a Principal Software Engineer, you will act in a technical leadership capacity responsible for driving innovative development efforts across our broad software ecosystem including edge computing, hardware control and automation, and high-rate telemetry systems. We are looking for someone who can work effectively with electrical, mechanical, and process engineering disciplines as well as technical executives to invent and implement complex, interdisciplinary performance requirements. As a startup, we expect this person to be hands on from architecture to implementation, writing code and solving the most complex issues. Ultimately, your contributions will result in the deployment of highly sophisticated software platforms capable of processing petabytes of high-rate data on the edge and automating factory systems around the world.  3D printing experience is not required to be successful here - rather we look for smart, motivated, collaborative engineers who love solving hard problems and creating amazing technology! Responsibilities: * Provide architectural leadership for the development of a complex, highly integrated software system  * Take on the most challenging development and implementation efforts in our software stack  * Lead system level integration and validation efforts  * Provide technical project management from conception to production when required by the size/scope of the project  * Drive communication and collaboration with the broader engineering team by working side-by-side with the electrical, mechanical, and process engineering teams  * Innovate on system capability and performance, accelerate engineering progress, and push the bounds of Freeform’s technology forward   Basic Qualifications: * 10+ years of hands-on experience architecting and implementing complex software systems using C/C++/Rust  * Experience in industries such as robotics, IoT, autonomous cars, UAVs, or similar autonomy-centric environments  * Experience working in a high-performance compute environment (FPGAs or GPUs)  Nice to Have: * BS, MS, or PhD in Computer Science, Computer Engineering, Electrical Engineering, or related field  * Experience with edge computing, high speed data acquisition, and real time closed-loop-control systems  * Experience with hardware acceleration for machine learning or artificial intelligence  * Experience working in a startup or leading-edge technology environment  * Creative thinker able to apply first-principles reasoning to solve complex problems  * Passion for how software can be used to impact the physical world  Location: * Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA’s deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. * Our fast-paced, cross-functional environment is built on close collaboration, and as such, this role requires full-time onsite presence (five days a week), with very limited exceptions. What We Offer: * We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions. * We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology. * Benefits * Significant stock option packages * 100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options) * Life insurance * Traditional and Roth 401(k) * Relocation assistance provided * Paid vacation, sick leave, and company holidays * Generous Paid Parental Leave and extended transition back to work for the birthing parent * Free daily catered lunch and dinner, and fully stocked kitchenette * Casual dress, flexible work hours, and regular catered team building events * Compensation   * As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company’s current stage of development and allows the employee to grow and develop within a role. * In addition to the significant stock option package, the estimated salary range for this role is $200,000-$400,000. The upper end of the range is reserved for individuals who demonstrate exceptional experience, deep domain mastery, and a proven history of high performance and impact. * Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Toast

Toast creates technology to help restaurants and local businesses succeed in a digital world, helping business owners operate, increase sales, engage customers, and keep employees happy. As a Principal Engineer / architect you will be responsible for creating a technical strategy and coordinating the designs for meeting the needs of Toast’s largest restaurant brands. You will partner with Product Managers to develop the technology roadmap that enables enterprise customers to leverage the power of Toast. You will also work closely with technical leaders and implementation teams across the organization to deliver robust, scalable solutions with integrations to customers’ external systems. While the role is primarily internally-facing, it requires infrequent interactions with enterprise customers, listening to their requirements and providing expert guidance as they deploy Toast. If you’re a technical leader or a solutions architect, experienced with enterprise SaaS, passionate about customer value, and a great collaborator, read on!  A day in the life (Responsibilities) * Lead the evolution of Toast’s backend architecture, frameworks, and data models with a strong focus on delivery efficiency, system scalability, and resilience. * Design and build the next generation of accounting and financial systems using Java, Kotlin, DynamoDB, Pulsar, GraphQL, Big Data tools, and more. * Define and implement scalable engineering practices, delivery frameworks, and coding standards that raise the technical bar across the org. * Collaborate cross-functionally with Product, UX, QA, and multiple engineering teams to deliver robust, customer-facing solutions. * Build and maintain strong partnerships across business units, aligning technology strategies with key company objectives. * Champion data-driven decision making by developing strategies and prioritizing initiatives with high impact on user and business outcomes. * Mentor and grow engineers across levels, promoting a culture of inclusivity, continuous learning, and engineering excellence. * Guide and influence the broader technical roadmap and architecture strategy for Toast. * Leverage cutting edge AI tools to enhance your development workflow, improve velocity, and help pioneer new approaches to building - contributing to a culture of innovation and productivity across the team What you'll need to thrive (Requirements) * 12+ years of experience designing and delivering complex, scalable backend systems. * Proven technical leadership on mission-critical projects, with the ability to influence across multiple teams. * Strong experience building distributed, event-driven architectures and microservices in Java, Kotlin, Scala, or similar OOP languages. * Deep understanding of data architecture and schema design; experience with DynamoDB is a plus. * Hands-on experience with cloud platforms like AWS, GCP, or Azure. * Strong knowledge of modern database systems (Postgres, SQL Server, DynamoDB). * Experience working in an Agile/Scrum environment, delivering value continuously. * Excellent analytical and problem-solving skills; ability to break down complexity and drive solutions that scale. * A passion for building impactful products with a customer-first mindset. * Strong interpersonal and leadership skills—respectful, empathetic, humble, and inclusive. * A growth mindset with a desire to constantly learn and uplift others. * Comfortable balancing velocity with platform stability and long-term architecture goals. * Comfortable using AI-powered engineering tools to improve developer productivity, code quality, and technical decision-making, with the ability to critically evaluate and validate AI-generated solutions.  * Demonstrated experience incorporating AI into the software development lifecycle to improve engineering effectiveness, and the ability to champion best practices for responsible, secure, and high-impact AI adoption across engineering teams.  AI at Toast At Toast, one of our company values is that we're hungry to build and learn. We believe learning new AI tools empowers us to build for our customers faster, more independently, and with higher quality. We provide these tools across all disciplines, from Engineering and Product to Sales and Support, and are inspired by how our Toasters are already driving real value with them. The people who thrive here are those who embrace changes that let us build more for our customers; it’s a core part of our culture. Our Total Rewards Philosophy  We strive to provide competitive compensation and benefits programs that help to attract, retain, and motivate the best and brightest people in our industry. Our total rewards package goes beyond great earnings potential and provides the means to a healthy lifestyle with the flexibility to meet Toasters’ changing needs. Learn more about our benefits at https://careers.toasttab.com/toast-benefits. How Toast Uses AI in its Hiring Process Throughout the hiring process, our goal is to get to know you. We use AI tools to support our recruiters and interviewers with tasks like note-taking, summarization, and documentation of interviews to ensure they can be fully focused on your conversation. All hiring decisions are made by people. To learn more: https://careers.toasttab.com/ai-in-hiring Our Approach to Hybrid Working We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the hospitality community, regardless of location. Please visit the Locations page on our career site to learn more about our in-office expectations by region: https://careers.toasttab.com/locations-toast Diversity, Equity, and Inclusion is Baked into our Recipe for Success At Toast, our employees are our secret ingredient—when they thrive, we thrive. The restaurant industry is one of the most diverse, and we embrace that diversity with authenticity, inclusivity, respect, and humility. By embedding these principles into our culture and design, we create equitable opportunities for all and raise the bar in delivering exceptional experiences. We Thrive Together We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the restaurant community. To learn more about how we work globally and regionally, check out: https://careers.toasttab.com/locations-toast. Apply today! Toast is committed to creating an accessible and inclusive hiring process. As part of this commitment, we strive to provide reasonable accommodations for persons with disabilities to enable them to access the hiring process. If you need an accommodation to access the job application or interview process, please contact candidateaccommodations@toasttab.com. ------ For roles in the United States, it is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.