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Senior Machine Learning Engineers at Thoughtworks build, maintain and test the architecture and infrastructure for managing machine learning applications. They are involved in supporting and contributing to the design of the end-to-end applications and products. They are responsible for building core capabilities including technical and functional machine learning systems and applications, being the anchor for functional streams of work and are accountable for timely delivery.
As a senior machine learning engineer, you will work on the latest tools, frameworks and offerings while also being involved in enabling credible and collaborative problem solving to execute on a strategy.
There is no one-size-fits-all career path at Thoughtworks: however you want to develop your career is entirely up to you. But we also balance autonomy with the strength of our cultivation culture. This means your career is supported by interactive tools, numerous development programs and teammates who want to help you grow. We see value in helping each other be our best and that extends to empowering our employees in their career journeys.
Thoughtworks is a dynamic and inclusive community of bright and supportive colleagues who are revolutionizing tech. As a leading technology consultancy, we’re pushing boundaries through our purposeful and impactful work. For 30+ years, we’ve delivered extraordinary impact together with our clients by helping them solve complex business problems with technology as the differentiator. Bring your brilliant expertise and commitment for continuous learning to Thoughtworks. Together, let’s be extraordinary.
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About Telnyx
Telnyx is an industry leader that's not just imagining the future of global connectivity—we're building it. From architecting and amplifying the reach of a private, global, multi-cloud IP network, to bringing hyperlocal edge technology right to your fingertips through intuitive APIs, we're shaping a new era of seamless interconnection between people, devices, and applications.
We're driven by a desire to transform and modernize what's antiquated, automate the manual, and solve real-world problems through innovative connectivity solutions. As a testament to our success, we're proud to stand as a financially stable and profitable company. Our robust profitability allows us not only to invest in pioneering technologies but also to foster an environment of continuous learning and growth for our team.
Our collective vision is a world where borderless connectivity fuels limitless innovation. By joining us, you can be part of laying the foundations for this interconnected future. We're currently seeking passionate individuals who are excited about the opportunity to contribute to an industry-shaping company while growing their own skills and careers.
We are looking for a Python developer who is curious, practical, and eager to grow within a strong engineering team. You should be comfortable writing Python, interested in backend systems, and willing to work in a fast-paced environment where reliability, security, and performance matter. You don't need to have mastered every part of our stack already, but you should be excited to learn, ask good questions, and build production-quality systems with support from experienced engineers.
You will work with our Python team to build secure, robust, and high-performance microservices that support critical revenue operations — including billing, tax calculation, customer commitments, and AI-powered automation. Over time, you will grow into owning parts of these services, helping us solve complex problems as the company scales.
People rely on our products to communicate every day, so we care deeply about resiliency, reliability, and thoughtful engineering.
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Why You'll Love This Role:
We're looking for an experienced ML Ops Engineer to join the ML/AI team at Newsela. This team works on projects ranging from classical Machine Learning to AI / Generative pipelines. This is a hands-on role. You'll work closely with ML/AI, data and site reliability engineers to take models from prototype to production, build robust data pipelines, and keep our services running smoothly as we continue to scale.
What You'll Be Doing:
About You:
Please note that given the nature of the contract, this role will not be eligible to participate in company-sponsored benefits
Newsela is a leading education technology company dedicated to meaningful classroom learning for every student. We deliver integrated, AI-powered solutions designed to unlock student engagement, empower teachers, and drive meaningful learning outcomes. Our suite of products supports knowledge and skill development, writing practice, daily instruction, assessment, and data-informed decision-making across K–12 classrooms. Grounded in learning science research, Newsela’s solutions integrate content, assessment, and analytics to help educators track progress, understand student outcomes, and deliver high-impact instruction that supports every learner.
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Why You'll Love This Role:
We're hiring a Senior Software Engineer Contractor for the Writing product team. This is a hands-on role on a small, full-stack team building AI-powered learning experiences. You'll ship across the product end-to-end: frontend, backend, data, and the LLM-driven services that sit behind our assessment features.
We work AI-native. Coding agents (Claude Code, Copilot, Cursor) are how this team builds, reviews, and operates, and we expect senior engineers to do more than use them. The strongest people on the team invest in the harness itself: writing skills, hooks, and custom workflows that make the next person faster.
A Senior Individual Contributor with a high agency. Someone who:
All offers of employment are contingent upon the successful completion of a background check as part of our pre-employment process.
Please note that given the nature of the contract, this role will not be eligible to participate in company-sponsored benefits.
Newsela is a leading education technology company dedicated to meaningful classroom learning for every student. We deliver integrated, AI-powered solutions designed to unlock student engagement, empower teachers, and drive meaningful learning outcomes. Our suite of products supports knowledge and skill development, writing practice, daily instruction, assessment, and data-informed decision-making across K–12 classrooms. Grounded in learning science research, Newsela’s solutions integrate content, assessment, and analytics to help educators track progress, understand student outcomes, and deliver high-impact instruction that supports every learner.
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The salary range for this role is $6,000 - $12,500 per month (Gross in USD)
About Sezzle:
With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
Compensation:
For this principal development role, with 12+ years of experience, the compensation range is $6,000 - $12,500 per month. This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level, offering a competitive salary to reflect the value of advanced skills and experience.
Interview Process
We believe transparency is important at Sezzle. Regularly providing feedback while setting expectations is part of our culture starting with the interview process. Advancement through each step is not guaranteed.
About the Role:
We are seeking a talented and motivated best-in-class Principal Software Engineer. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement.
As a Principal Software Engineer with Sezzle, you will work with highly-motivated teams to tackle interesting and challenging problems across multiple areas of the organization. Your experience and guidance will help other members of the team level-up their own skills as well. You will spend your time working with AI/ML tooling to identify creative uses to fill existing and emerging gaps in the applications.
In this backend focused role, you will work closely with stakeholders from Product, Support and the business. You’ll also partner with other engineering teams to provide high-quality, scalable, and innovative solutions to internal and customer problems. Your day-to-day responsibilities will include designing, developing, and delivering new features, as well as unblocking and mentoring your teammates. Your work will generally focus on the lower level features and optimizations.
This role has both an internal and external focus, your contributions will make a meaningful difference in the day-to-day lives of your peers at Sezzle, enhancing their ability to support our business and customers, and you will have opportunities to take any feedback and iterate.
What You'll Do:
What We Look For:
Preferred Knowledge and Skills:
About You:
Sezzle’s Technology Stack:
What Makes Working at Sezzle Awesome?
At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
#Li-remote #full-time
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With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
About the Role:
We are seeking a talented and motivated Marketing Analyst- Comms who is best in class, with a high IQ and a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with strong prospects for continued growth and increased ownership.
The Marketing Analyst - Comms, will sit at the intersection of data, CRM strategy, and AI-driven efficiency. We’re looking for an execution-oriented person who owns their work from end-to-end. You'll dive into the details of how our campaigns operate across email, push, SMS, and in-app channels, spot friction and inefficiency, and design smarter ways forward. You'll spend most of your time inside Braze, Sezzle's primary consumer-focused CRM and marketing automation platform, building and analyzing campaigns across email, push, SMS, and in-app channels. You'll dig into performance data to identify what's working, surface gaps in our consumer journeys, and develop new comms to fill them. You'll also look for every opportunity to apply AI tools to make the team's output faster, sharper, and more scalable.
This isn't a role where you wait for assignments. We want someone who can look at a set of data, identify the opportunity, and start building toward it then communicate what they found and why it matters to the team around them.
What You'll Do:
CRM Campaign Execution & Analysis
Build, launch, and iterate on campaigns and canvases in Braze across email, push, SMS, and in-app channels.
Audit existing consumer journeys to identify engagement gaps, drop-off points, and missed messaging opportunities.
Develop segmentation strategies and personalized comms that improve activation, engagement, and retention.
Support A/B test design, execution, and readout — translating results into clear, actionable recommendations.
Maintain performance dashboards and reporting frameworks that make campaign data interpretable for the broader marketing team.
Track KPIs including DAU, ARPDAU, LTV per user, open rates, click rates, and conversion, and surface insights tied to those metrics.
Effectively manage our marketing CRM tool to drive new and innovative use cases that can be shared across the team
Write SQL queries to investigate issues and campaign results using internal data
AI, Automation & Process Optimization
Identify opportunities to apply AI tools and automation across marketing workflows from copy generation to campaign QA to performance analysis.
Build and iterate on tools, templates, and agents that reduce manual effort and improve output consistency.
Stay current on emerging AI/automation capabilities and bring concrete recommendations for how they can be applied within Sezzle's marketing stack.
Cross-Functional Collaboration
Partner with marketing, product, data, and engineering teams to align on tooling decisions and ensure smooth implementation.
Serve as a connector between technical teams and marketing stakeholders, translating requirements in both directions.
Facilitate adoption of new tools and workflows by developing documentation, training materials, and hands-on support for team members.
Identify and flag integration risks early; bring concrete mitigation recommendations.
What We Look for:
Skills & Competencies
Hands-on experience building or implementing AI tools, agents, and automation in a professional setting.
Strong analytical skills, comfortable working with data, running queries, and presenting findings with context.
Experience in consumer marketing operations, CRM platforms (Braze or similar), or marketing technology stacks; Braze experience is a plus.
Ability to identify process inefficiencies and develop structured, scalable solutions.
Excellent written and verbal communication skills, and you can explain technical concepts clearly to non-technical teammates.
Basic project management skills; organized, proactive, and reliable with deadlines.
Experience with segmentation, A/B testing, and performance reporting.
Strong experience in data visualization tools and SQL.
Ability to prioritize and manage multiple tasks simultaneously
Educational & Professional Experience
Background in computer science, analytics, engineering, AI, and/or related fields.
Exposure to business, marketing, finance, or other related fields
Previous internships or academic projects involving campaign management, marketing analytics, and content creation preferred.
Professional, academic or personal projects that demonstrate an ability to creatively use AI to create efficiencies.
Preferred Qualifications:
Experience building AI-first platforms or internal products from scratch, including early architectural decisions.
Strong foundation in core machine learning and data science principles, including supervised/unsupervised learning, feature engineering, model evaluation, and statistical inference.
Experience with transformer architectures (BERT, GPT, etc.) and understanding of attention mechanisms, tokenization, and fine-tuning strategies for domain-specific applications.
Experience developing AI-assisted or agentic systems that interact with tools, data, or workflows.
Familiarity with embeddings and vector representations, including text embeddings, similarity search, and integration with vector databases (Pinecone, Weaviate, pgvector, or similar).
Experience with NLP techniques including text classification, named entity recognition, semantic search, and information extraction.
Familiarity with cloud-native development using AWS.
Understanding of prompt engineering, retrieval-augmented generation (RAG), and LLM application patterns.
Experience with containerized systems and orchestration tools such as Docker and Kubernetes.
Exposure to CI/CD pipelines and modern development workflows (e.g., GitLab).
Experience with Golang is a plus (or willingness to learn).
Experience with Braze or similar consumer facing CRM platforms and/or various B2C digital marketing channels like affiliate, CTV, paid social, paid search, GEO/SEO, DSP.
About You:
You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.
You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things
You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.
You earn trust - you listen attentively, speak candidly, and treat others respectfully.
What Makes Working at Sezzle Awesome:
At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators. We believe in surrounding ourselves with only the best and the brightest individuals. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
#Li-remote #full-time
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